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// Author: wan@google.com (Zhanyong Wan)
// Google Mock - a framework for writing C++ mock classes.
//
// This file implements some commonly used argument matchers. More
// matchers can be defined by the user implementing the
// MatcherInterface<T> interface if necessary.
#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#define GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#include <algorithm>
#include <limits>
#include <ostream> // NOLINT
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include "gmock/internal/gmock-internal-utils.h"
#include "gmock/internal/gmock-port.h"
#include "gtest/gtest.h"
namespace testing {
// To implement a matcher Foo for type T, define:
// 1. a class FooMatcherImpl that implements the
// MatcherInterface<T> interface, and
// 2. a factory function that creates a Matcher<T> object from a
// FooMatcherImpl*.
//
// The two-level delegation design makes it possible to allow a user
// to write "v" instead of "Eq(v)" where a Matcher is expected, which
// is impossible if we pass matchers by pointers. It also eases
// ownership management as Matcher objects can now be copied like
// plain values.
// MatchResultListener is an abstract class. Its << operator can be
// used by a matcher to explain why a value matches or doesn't match.
//
// TODO(wan@google.com): add method
// bool InterestedInWhy(bool result) const;
// to indicate whether the listener is interested in why the match
// result is 'result'.
class MatchResultListener {
public:
// Creates a listener object with the given underlying ostream. The
// listener does not own the ostream.
explicit MatchResultListener(::std::ostream* os) : stream_(os) {}
virtual ~MatchResultListener() = 0; // Makes this class abstract.
// Streams x to the underlying ostream; does nothing if the ostream
// is NULL.
template <typename T>
MatchResultListener& operator<<(const T& x) {
if (stream_ != NULL)
*stream_ << x;
return *this;
}
// Returns the underlying ostream.
::std::ostream* stream() { return stream_; }
// Returns true iff the listener is interested in an explanation of
// the match result. A matcher's MatchAndExplain() method can use
// this information to avoid generating the explanation when no one
// intends to hear it.
bool IsInterested() const { return stream_ != NULL; }
private:
::std::ostream* const stream_;
GTEST_DISALLOW_COPY_AND_ASSIGN_(MatchResultListener);
};
inline MatchResultListener::~MatchResultListener() {
}
// The implementation of a matcher.
template <typename T>
class MatcherInterface {
public:
virtual ~MatcherInterface() {}
// Returns true iff the matcher matches x; also explains the match
// result to 'listener', in the form of a non-restrictive relative
// clause ("which ...", "whose ...", etc) that describes x. For
// example, the MatchAndExplain() method of the Pointee(...) matcher
// should generate an explanation like "which points to ...".
//
// You should override this method when defining a new matcher.
//
// It's the responsibility of the caller (Google Mock) to guarantee
// that 'listener' is not NULL. This helps to simplify a matcher's
// implementation when it doesn't care about the performance, as it
// can talk to 'listener' without checking its validity first.
// However, in order to implement dummy listeners efficiently,
// listener->stream() may be NULL.
virtual bool MatchAndExplain(T x, MatchResultListener* listener) const = 0;
// Describes this matcher to an ostream. The function should print
// a verb phrase that describes the property a value matching this
// matcher should have. The subject of the verb phrase is the value
// being matched. For example, the DescribeTo() method of the Gt(7)
// matcher prints "is greater than 7".
virtual void DescribeTo(::std::ostream* os) const = 0;
// Describes the negation of this matcher to an ostream. For
// example, if the description of this matcher is "is greater than
// 7", the negated description could be "is not greater than 7".
// You are not required to override this when implementing
// MatcherInterface, but it is highly advised so that your matcher
// can produce good error messages.
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "not (";
DescribeTo(os);
*os << ")";
}
};
namespace internal {
// A match result listener that ignores the explanation.
class DummyMatchResultListener : public MatchResultListener {
public:
DummyMatchResultListener() : MatchResultListener(NULL) {}
private:
GTEST_DISALLOW_COPY_AND_ASSIGN_(DummyMatchResultListener);
};
// A match result listener that forwards the explanation to a given
// ostream. The difference between this and MatchResultListener is
// that the former is concrete.
class StreamMatchResultListener : public MatchResultListener {
public:
explicit StreamMatchResultListener(::std::ostream* os)
: MatchResultListener(os) {}
private:
GTEST_DISALLOW_COPY_AND_ASSIGN_(StreamMatchResultListener);
};
// A match result listener that stores the explanation in a string.
class StringMatchResultListener : public MatchResultListener {
public:
StringMatchResultListener() : MatchResultListener(&ss_) {}
// Returns the explanation heard so far.
internal::string str() const { return ss_.str(); }
private:
::std::stringstream ss_;
GTEST_DISALLOW_COPY_AND_ASSIGN_(StringMatchResultListener);
};
// An internal class for implementing Matcher<T>, which will derive
// from it. We put functionalities common to all Matcher<T>
// specializations here to avoid code duplication.
template <typename T>
class MatcherBase {
public:
// Returns true iff the matcher matches x; also explains the match
// result to 'listener'.
bool MatchAndExplain(T x, MatchResultListener* listener) const {
return impl_->MatchAndExplain(x, listener);
}
// Returns true iff this matcher matches x.
bool Matches(T x) const {
DummyMatchResultListener dummy;
return MatchAndExplain(x, &dummy);
}
// Describes this matcher to an ostream.
void DescribeTo(::std::ostream* os) const { impl_->DescribeTo(os); }
// Describes the negation of this matcher to an ostream.
void DescribeNegationTo(::std::ostream* os) const {
impl_->DescribeNegationTo(os);
}
// Explains why x matches, or doesn't match, the matcher.
void ExplainMatchResultTo(T x, ::std::ostream* os) const {
StreamMatchResultListener listener(os);
MatchAndExplain(x, &listener);
}
protected:
MatcherBase() {}
// Constructs a matcher from its implementation.
explicit MatcherBase(const MatcherInterface<T>* impl)
: impl_(impl) {}
virtual ~MatcherBase() {}
private:
// shared_ptr (util/gtl/shared_ptr.h) and linked_ptr have similar
// interfaces. The former dynamically allocates a chunk of memory
// to hold the reference count, while the latter tracks all
// references using a circular linked list without allocating
// memory. It has been observed that linked_ptr performs better in
// typical scenarios. However, shared_ptr can out-perform
// linked_ptr when there are many more uses of the copy constructor
// than the default constructor.
//
// If performance becomes a problem, we should see if using
// shared_ptr helps.
::testing::internal::linked_ptr<const MatcherInterface<T> > impl_;
};
} // namespace internal
// A Matcher<T> is a copyable and IMMUTABLE (except by assignment)
// object that can check whether a value of type T matches. The
// implementation of Matcher<T> is just a linked_ptr to const
// MatcherInterface<T>, so copying is fairly cheap. Don't inherit
// from Matcher!
template <typename T>
class Matcher : public internal::MatcherBase<T> {
public:
// Constructs a null matcher. Needed for storing Matcher objects in STL
// containers. A default-constructed matcher is not yet initialized. You
// cannot use it until a valid value has been assigned to it.
Matcher() {}
// Constructs a matcher from its implementation.
explicit Matcher(const MatcherInterface<T>* impl)
: internal::MatcherBase<T>(impl) {}
// Implicit constructor here allows people to write
// EXPECT_CALL(foo, Bar(5)) instead of EXPECT_CALL(foo, Bar(Eq(5))) sometimes
Matcher(T value); // NOLINT
};
// The following two specializations allow the user to write str
// instead of Eq(str) and "foo" instead of Eq("foo") when a string
// matcher is expected.
template <>
class Matcher<const internal::string&>
: public internal::MatcherBase<const internal::string&> {
public:
Matcher() {}
explicit Matcher(const MatcherInterface<const internal::string&>* impl)
: internal::MatcherBase<const internal::string&>(impl) {}
// Allows the user to write str instead of Eq(str) sometimes, where
// str is a string object.
Matcher(const internal::string& s); // NOLINT
// Allows the user to write "foo" instead of Eq("foo") sometimes.
Matcher(const char* s); // NOLINT
};
template <>
class Matcher<internal::string>
: public internal::MatcherBase<internal::string> {
public:
Matcher() {}
explicit Matcher(const MatcherInterface<internal::string>* impl)
: internal::MatcherBase<internal::string>(impl) {}
// Allows the user to write str instead of Eq(str) sometimes, where
// str is a string object.
Matcher(const internal::string& s); // NOLINT
// Allows the user to write "foo" instead of Eq("foo") sometimes.
Matcher(const char* s); // NOLINT
};
// The PolymorphicMatcher class template makes it easy to implement a
// polymorphic matcher (i.e. a matcher that can match values of more
// than one type, e.g. Eq(n) and NotNull()).
//
// To define a polymorphic matcher, a user should provide an Impl
// class that has a DescribeTo() method and a DescribeNegationTo()
// method, and define a member function (or member function template)
//
// bool MatchAndExplain(const Value& value,
// MatchResultListener* listener) const;
//
// See the definition of NotNull() for a complete example.
template <class Impl>
class PolymorphicMatcher {
public:
explicit PolymorphicMatcher(const Impl& an_impl) : impl_(an_impl) {}
// Returns a mutable reference to the underlying matcher
// implementation object.
Impl& mutable_impl() { return impl_; }
// Returns an immutable reference to the underlying matcher
// implementation object.
const Impl& impl() const { return impl_; }
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new MonomorphicImpl<T>(impl_));
}
private:
template <typename T>
class MonomorphicImpl : public MatcherInterface<T> {
public:
explicit MonomorphicImpl(const Impl& impl) : impl_(impl) {}
virtual void DescribeTo(::std::ostream* os) const {
impl_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
impl_.DescribeNegationTo(os);
}
virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
return impl_.MatchAndExplain(x, listener);
}
private:
const Impl impl_;
GTEST_DISALLOW_ASSIGN_(MonomorphicImpl);
};
Impl impl_;
GTEST_DISALLOW_ASSIGN_(PolymorphicMatcher);
};
// Creates a matcher from its implementation. This is easier to use
// than the Matcher<T> constructor as it doesn't require you to
// explicitly write the template argument, e.g.
//
// MakeMatcher(foo);
// vs
// Matcher<const string&>(foo);
template <typename T>
inline Matcher<T> MakeMatcher(const MatcherInterface<T>* impl) {
return Matcher<T>(impl);
};
// Creates a polymorphic matcher from its implementation. This is
// easier to use than the PolymorphicMatcher<Impl> constructor as it
// doesn't require you to explicitly write the template argument, e.g.
//
// MakePolymorphicMatcher(foo);
// vs
// PolymorphicMatcher<TypeOfFoo>(foo);
template <class Impl>
inline PolymorphicMatcher<Impl> MakePolymorphicMatcher(const Impl& impl) {
return PolymorphicMatcher<Impl>(impl);
}
// In order to be safe and clear, casting between different matcher
// types is done explicitly via MatcherCast<T>(m), which takes a
// matcher m and returns a Matcher<T>. It compiles only when T can be
// statically converted to the argument type of m.
template <typename T, typename M>
Matcher<T> MatcherCast(M m);
// Implements SafeMatcherCast().
//
// We use an intermediate class to do the actual safe casting as Nokia's
// Symbian compiler cannot decide between
// template <T, M> ... (M) and
// template <T, U> ... (const Matcher<U>&)
// for function templates but can for member function templates.
template <typename T>
class SafeMatcherCastImpl {
public:
// This overload handles polymorphic matchers only since monomorphic
// matchers are handled by the next one.
template <typename M>
static inline Matcher<T> Cast(M polymorphic_matcher) {
return Matcher<T>(polymorphic_matcher);
}
// This overload handles monomorphic matchers.
//
// In general, if type T can be implicitly converted to type U, we can
// safely convert a Matcher<U> to a Matcher<T> (i.e. Matcher is
// contravariant): just keep a copy of the original Matcher<U>, convert the
// argument from type T to U, and then pass it to the underlying Matcher<U>.
// The only exception is when U is a reference and T is not, as the
// underlying Matcher<U> may be interested in the argument's address, which
// is not preserved in the conversion from T to U.
template <typename U>
static inline Matcher<T> Cast(const Matcher<U>& matcher) {
// Enforce that T can be implicitly converted to U.
GTEST_COMPILE_ASSERT_((internal::ImplicitlyConvertible<T, U>::value),
T_must_be_implicitly_convertible_to_U);
// Enforce that we are not converting a non-reference type T to a reference
// type U.
GTEST_COMPILE_ASSERT_(
internal::is_reference<T>::value || !internal::is_reference<U>::value,
cannot_convert_non_referentce_arg_to_reference);
// In case both T and U are arithmetic types, enforce that the
// conversion is not lossy.
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(T) RawT;
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(U) RawU;
const bool kTIsOther = GMOCK_KIND_OF_(RawT) == internal::kOther;
const bool kUIsOther = GMOCK_KIND_OF_(RawU) == internal::kOther;
GTEST_COMPILE_ASSERT_(
kTIsOther || kUIsOther ||
(internal::LosslessArithmeticConvertible<RawT, RawU>::value),
conversion_of_arithmetic_types_must_be_lossless);
return MatcherCast<T>(matcher);
}
};
template <typename T, typename M>
inline Matcher<T> SafeMatcherCast(const M& polymorphic_matcher) {
return SafeMatcherCastImpl<T>::Cast(polymorphic_matcher);
}
// A<T>() returns a matcher that matches any value of type T.
template <typename T>
Matcher<T> A();
// Anything inside the 'internal' namespace IS INTERNAL IMPLEMENTATION
// and MUST NOT BE USED IN USER CODE!!!
namespace internal {
// If the explanation is not empty, prints it to the ostream.
inline void PrintIfNotEmpty(const internal::string& explanation,
std::ostream* os) {
if (explanation != "" && os != NULL) {
*os << ", " << explanation;
}
}
// Returns true if the given type name is easy to read by a human.
// This is used to decide whether printing the type of a value might
// be helpful.
inline bool IsReadableTypeName(const string& type_name) {
// We consider a type name readable if it's short or doesn't contain
// a template or function type.
return (type_name.length() <= 20 ||
type_name.find_first_of("<(") == string::npos);
}
// Matches the value against the given matcher, prints the value and explains
// the match result to the listener. Returns the match result.
// 'listener' must not be NULL.
// Value cannot be passed by const reference, because some matchers take a
// non-const argument.
template <typename Value, typename T>
bool MatchPrintAndExplain(Value& value, const Matcher<T>& matcher,
MatchResultListener* listener) {
if (!listener->IsInterested()) {
// If the listener is not interested, we do not need to construct the
// inner explanation.
return matcher.Matches(value);
}
StringMatchResultListener inner_listener;
const bool match = matcher.MatchAndExplain(value, &inner_listener);
UniversalPrint(value, listener->stream());
#if GTEST_HAS_RTTI
const string& type_name = GetTypeName<Value>();
if (IsReadableTypeName(type_name))
*listener->stream() << " (of type " << type_name << ")";
#endif
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return match;
}
// An internal helper class for doing compile-time loop on a tuple's
// fields.
template <size_t N>
class TuplePrefix {
public:
// TuplePrefix<N>::Matches(matcher_tuple, value_tuple) returns true
// iff the first N fields of matcher_tuple matches the first N
// fields of value_tuple, respectively.
template <typename MatcherTuple, typename ValueTuple>
static bool Matches(const MatcherTuple& matcher_tuple,
const ValueTuple& value_tuple) {
using ::std::tr1::get;
return TuplePrefix<N - 1>::Matches(matcher_tuple, value_tuple)
&& get<N - 1>(matcher_tuple).Matches(get<N - 1>(value_tuple));
}
// TuplePrefix<N>::ExplainMatchFailuresTo(matchers, values, os)
// describes failures in matching the first N fields of matchers
// against the first N fields of values. If there is no failure,
// nothing will be streamed to os.
template <typename MatcherTuple, typename ValueTuple>
static void ExplainMatchFailuresTo(const MatcherTuple& matchers,
const ValueTuple& values,
::std::ostream* os) {
using ::std::tr1::tuple_element;
using ::std::tr1::get;
// First, describes failures in the first N - 1 fields.
TuplePrefix<N - 1>::ExplainMatchFailuresTo(matchers, values, os);
// Then describes the failure (if any) in the (N - 1)-th (0-based)
// field.
typename tuple_element<N - 1, MatcherTuple>::type matcher =
get<N - 1>(matchers);
typedef typename tuple_element<N - 1, ValueTuple>::type Value;
Value value = get<N - 1>(values);
StringMatchResultListener listener;
if (!matcher.MatchAndExplain(value, &listener)) {
// TODO(wan): include in the message the name of the parameter
// as used in MOCK_METHOD*() when possible.
*os << " Expected arg #" << N - 1 << ": ";
get<N - 1>(matchers).DescribeTo(os);
*os << "\n Actual: ";
// We remove the reference in type Value to prevent the
// universal printer from printing the address of value, which
// isn't interesting to the user most of the time. The
// matcher's MatchAndExplain() method handles the case when
// the address is interesting.
internal::UniversalPrint(value, os);
PrintIfNotEmpty(listener.str(), os);
*os << "\n";
}
}
};
// The base case.
template <>
class TuplePrefix<0> {
public:
template <typename MatcherTuple, typename ValueTuple>
static bool Matches(const MatcherTuple& /* matcher_tuple */,
const ValueTuple& /* value_tuple */) {
return true;
}
template <typename MatcherTuple, typename ValueTuple>
static void ExplainMatchFailuresTo(const MatcherTuple& /* matchers */,
const ValueTuple& /* values */,
::std::ostream* /* os */) {}
};
// TupleMatches(matcher_tuple, value_tuple) returns true iff all
// matchers in matcher_tuple match the corresponding fields in
// value_tuple. It is a compiler error if matcher_tuple and
// value_tuple have different number of fields or incompatible field
// types.
template <typename MatcherTuple, typename ValueTuple>
bool TupleMatches(const MatcherTuple& matcher_tuple,
const ValueTuple& value_tuple) {
using ::std::tr1::tuple_size;
// Makes sure that matcher_tuple and value_tuple have the same
// number of fields.
GTEST_COMPILE_ASSERT_(tuple_size<MatcherTuple>::value ==
tuple_size<ValueTuple>::value,
matcher_and_value_have_different_numbers_of_fields);
return TuplePrefix<tuple_size<ValueTuple>::value>::
Matches(matcher_tuple, value_tuple);
}
// Describes failures in matching matchers against values. If there
// is no failure, nothing will be streamed to os.
template <typename MatcherTuple, typename ValueTuple>
void ExplainMatchFailureTupleTo(const MatcherTuple& matchers,
const ValueTuple& values,
::std::ostream* os) {
using ::std::tr1::tuple_size;
TuplePrefix<tuple_size<MatcherTuple>::value>::ExplainMatchFailuresTo(
matchers, values, os);
}
// The MatcherCastImpl class template is a helper for implementing
// MatcherCast(). We need this helper in order to partially
// specialize the implementation of MatcherCast() (C++ allows
// class/struct templates to be partially specialized, but not
// function templates.).
// This general version is used when MatcherCast()'s argument is a
// polymorphic matcher (i.e. something that can be converted to a
// Matcher but is not one yet; for example, Eq(value)).
template <typename T, typename M>
class MatcherCastImpl {
public:
static Matcher<T> Cast(M polymorphic_matcher) {
return Matcher<T>(polymorphic_matcher);
}
};
// This more specialized version is used when MatcherCast()'s argument
// is already a Matcher. This only compiles when type T can be
// statically converted to type U.
template <typename T, typename U>
class MatcherCastImpl<T, Matcher<U> > {
public:
static Matcher<T> Cast(const Matcher<U>& source_matcher) {
return Matcher<T>(new Impl(source_matcher));
}
private:
class Impl : public MatcherInterface<T> {
public:
explicit Impl(const Matcher<U>& source_matcher)
: source_matcher_(source_matcher) {}
// We delegate the matching logic to the source matcher.
virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
return source_matcher_.MatchAndExplain(static_cast<U>(x), listener);
}
virtual void DescribeTo(::std::ostream* os) const {
source_matcher_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
source_matcher_.DescribeNegationTo(os);
}
private:
const Matcher<U> source_matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
};
// This even more specialized version is used for efficiently casting
// a matcher to its own type.
template <typename T>
class MatcherCastImpl<T, Matcher<T> > {
public:
static Matcher<T> Cast(const Matcher<T>& matcher) { return matcher; }
};
// Implements A<T>().
template <typename T>
class AnyMatcherImpl : public MatcherInterface<T> {
public:
virtual bool MatchAndExplain(
T /* x */, MatchResultListener* /* listener */) const { return true; }
virtual void DescribeTo(::std::ostream* os) const { *os << "is anything"; }
virtual void DescribeNegationTo(::std::ostream* os) const {
// This is mostly for completeness' safe, as it's not very useful
// to write Not(A<bool>()). However we cannot completely rule out
// such a possibility, and it doesn't hurt to be prepared.
*os << "never matches";
}
};
// Implements _, a matcher that matches any value of any
// type. This is a polymorphic matcher, so we need a template type
// conversion operator to make it appearing as a Matcher<T> for any
// type T.
class AnythingMatcher {
public:
template <typename T>
operator Matcher<T>() const { return A<T>(); }
};
// Implements a matcher that compares a given value with a
// pre-supplied value using one of the ==, <=, <, etc, operators. The
// two values being compared don't have to have the same type.
//
// The matcher defined here is polymorphic (for example, Eq(5) can be
// used to match an int, a short, a double, etc). Therefore we use
// a template type conversion operator in the implementation.
//
// We define this as a macro in order to eliminate duplicated source
// code.
//
// The following template definition assumes that the Rhs parameter is
// a "bare" type (i.e. neither 'const T' nor 'T&').
#define GMOCK_IMPLEMENT_COMPARISON_MATCHER_( \
name, op, relation, negated_relation) \
template <typename Rhs> class name##Matcher { \
public: \
explicit name##Matcher(const Rhs& rhs) : rhs_(rhs) {} \
template <typename Lhs> \
operator Matcher<Lhs>() const { \
return MakeMatcher(new Impl<Lhs>(rhs_)); \
} \
private: \
template <typename Lhs> \
class Impl : public MatcherInterface<Lhs> { \
public: \
explicit Impl(const Rhs& rhs) : rhs_(rhs) {} \
virtual bool MatchAndExplain(\
Lhs lhs, MatchResultListener* /* listener */) const { \
return lhs op rhs_; \
} \
virtual void DescribeTo(::std::ostream* os) const { \
*os << relation " "; \
UniversalPrint(rhs_, os); \
} \
virtual void DescribeNegationTo(::std::ostream* os) const { \
*os << negated_relation " "; \
UniversalPrint(rhs_, os); \
} \
private: \
Rhs rhs_; \
GTEST_DISALLOW_ASSIGN_(Impl); \
}; \
Rhs rhs_; \
GTEST_DISALLOW_ASSIGN_(name##Matcher); \
}
// Implements Eq(v), Ge(v), Gt(v), Le(v), Lt(v), and Ne(v)
// respectively.
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Eq, ==, "is equal to", "isn't equal to");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Ge, >=, "is >=", "isn't >=");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Gt, >, "is >", "isn't >");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Le, <=, "is <=", "isn't <=");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Lt, <, "is <", "isn't <");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Ne, !=, "isn't equal to", "is equal to");
#undef GMOCK_IMPLEMENT_COMPARISON_MATCHER_
// Implements the polymorphic IsNull() matcher, which matches any raw or smart
// pointer that is NULL.
class IsNullMatcher {
public:
template <typename Pointer>
bool MatchAndExplain(const Pointer& p,
MatchResultListener* /* listener */) const {
return GetRawPointer(p) == NULL;
}
void DescribeTo(::std::ostream* os) const { *os << "is NULL"; }
void DescribeNegationTo(::std::ostream* os) const {
*os << "isn't NULL";
}
};
// Implements the polymorphic NotNull() matcher, which matches any raw or smart
// pointer that is not NULL.
class NotNullMatcher {
public:
template <typename Pointer>
bool MatchAndExplain(const Pointer& p,
MatchResultListener* /* listener */) const {
return GetRawPointer(p) != NULL;
}
void DescribeTo(::std::ostream* os) const { *os << "isn't NULL"; }
void DescribeNegationTo(::std::ostream* os) const {
*os << "is NULL";
}
};
// Ref(variable) matches any argument that is a reference to
// 'variable'. This matcher is polymorphic as it can match any
// super type of the type of 'variable'.
//
// The RefMatcher template class implements Ref(variable). It can
// only be instantiated with a reference type. This prevents a user
// from mistakenly using Ref(x) to match a non-reference function
// argument. For example, the following will righteously cause a
// compiler error:
//
// int n;
// Matcher<int> m1 = Ref(n); // This won't compile.
// Matcher<int&> m2 = Ref(n); // This will compile.
template <typename T>
class RefMatcher;
template <typename T>
class RefMatcher<T&> {
// Google Mock is a generic framework and thus needs to support
// mocking any function types, including those that take non-const
// reference arguments. Therefore the template parameter T (and
// Super below) can be instantiated to either a const type or a
// non-const type.
public:
// RefMatcher() takes a T& instead of const T&, as we want the
// compiler to catch using Ref(const_value) as a matcher for a
// non-const reference.
explicit RefMatcher(T& x) : object_(x) {} // NOLINT
template <typename Super>
operator Matcher<Super&>() const {
// By passing object_ (type T&) to Impl(), which expects a Super&,
// we make sure that Super is a super type of T. In particular,
// this catches using Ref(const_value) as a matcher for a
// non-const reference, as you cannot implicitly convert a const
// reference to a non-const reference.
return MakeMatcher(new Impl<Super>(object_));
}
private:
template <typename Super>
class Impl : public MatcherInterface<Super&> {
public:
explicit Impl(Super& x) : object_(x) {} // NOLINT
// MatchAndExplain() takes a Super& (as opposed to const Super&)
// in order to match the interface MatcherInterface<Super&>.
virtual bool MatchAndExplain(
Super& x, MatchResultListener* listener) const {
*listener << "which is located @" << static_cast<const void*>(&x);
return &x == &object_;
}
virtual void DescribeTo(::std::ostream* os) const {
*os << "references the variable ";
UniversalPrinter<Super&>::Print(object_, os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "does not reference the variable ";
UniversalPrinter<Super&>::Print(object_, os);
}
private:
const Super& object_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
T& object_;
GTEST_DISALLOW_ASSIGN_(RefMatcher);
};
// Polymorphic helper functions for narrow and wide string matchers.
inline bool CaseInsensitiveCStringEquals(const char* lhs, const char* rhs) {
return String::CaseInsensitiveCStringEquals(lhs, rhs);
}
inline bool CaseInsensitiveCStringEquals(const wchar_t* lhs,
const wchar_t* rhs) {
return String::CaseInsensitiveWideCStringEquals(lhs, rhs);
}
// String comparison for narrow or wide strings that can have embedded NUL
// characters.
template <typename StringType>
bool CaseInsensitiveStringEquals(const StringType& s1,
const StringType& s2) {
// Are the heads equal?
if (!CaseInsensitiveCStringEquals(s1.c_str(), s2.c_str())) {
return false;
}
// Skip the equal heads.
const typename StringType::value_type nul = 0;
const size_t i1 = s1.find(nul), i2 = s2.find(nul);
// Are we at the end of either s1 or s2?
if (i1 == StringType::npos || i2 == StringType::npos) {
return i1 == i2;
}
// Are the tails equal?
return CaseInsensitiveStringEquals(s1.substr(i1 + 1), s2.substr(i2 + 1));
}
// String matchers.
// Implements equality-based string matchers like StrEq, StrCaseNe, and etc.
template <typename StringType>
class StrEqualityMatcher {
public:
typedef typename StringType::const_pointer ConstCharPointer;
StrEqualityMatcher(const StringType& str, bool expect_eq,
bool case_sensitive)
: string_(str), expect_eq_(expect_eq), case_sensitive_(case_sensitive) {}
// When expect_eq_ is true, returns true iff s is equal to string_;
// otherwise returns true iff s is not equal to string_.
bool MatchAndExplain(ConstCharPointer s,
MatchResultListener* listener) const {
if (s == NULL) {
return !expect_eq_;
}
return MatchAndExplain(StringType(s), listener);
}
bool MatchAndExplain(const StringType& s,
MatchResultListener* /* listener */) const {
const bool eq = case_sensitive_ ? s == string_ :
CaseInsensitiveStringEquals(s, string_);
return expect_eq_ == eq;
}
void DescribeTo(::std::ostream* os) const {
DescribeToHelper(expect_eq_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
DescribeToHelper(!expect_eq_, os);
}
private:
void DescribeToHelper(bool expect_eq, ::std::ostream* os) const {
*os << (expect_eq ? "is " : "isn't ");
*os << "equal to ";
if (!case_sensitive_) {
*os << "(ignoring case) ";
}
UniversalPrint(string_, os);
}
const StringType string_;
const bool expect_eq_;
const bool case_sensitive_;
GTEST_DISALLOW_ASSIGN_(StrEqualityMatcher);
};
// Implements the polymorphic HasSubstr(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class HasSubstrMatcher {
public:
typedef typename StringType::const_pointer ConstCharPointer;
explicit HasSubstrMatcher(const StringType& substring)
: substring_(substring) {}
// These overloaded methods allow HasSubstr(substring) to be used as a
// Matcher<T> as long as T can be converted to string. Returns true
// iff s contains substring_ as a substring.
bool MatchAndExplain(ConstCharPointer s,
MatchResultListener* listener) const {
return s != NULL && MatchAndExplain(StringType(s), listener);
}
bool MatchAndExplain(const StringType& s,
MatchResultListener* /* listener */) const {
return s.find(substring_) != StringType::npos;
}
// Describes what this matcher matches.
void DescribeTo(::std::ostream* os) const {
*os << "has substring ";
UniversalPrint(substring_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "has no substring ";
UniversalPrint(substring_, os);
}
private:
const StringType substring_;
GTEST_DISALLOW_ASSIGN_(HasSubstrMatcher);
};
// Implements the polymorphic StartsWith(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class StartsWithMatcher {
public:
typedef typename StringType::const_pointer ConstCharPointer;
explicit StartsWithMatcher(const StringType& prefix) : prefix_(prefix) {
}
// These overloaded methods allow StartsWith(prefix) to be used as a
// Matcher<T> as long as T can be converted to string. Returns true
// iff s starts with prefix_.
bool MatchAndExplain(ConstCharPointer s,
MatchResultListener* listener) const {
return s != NULL && MatchAndExplain(StringType(s), listener);
}
bool MatchAndExplain(const StringType& s,
MatchResultListener* /* listener */) const {
return s.length() >= prefix_.length() &&
s.substr(0, prefix_.length()) == prefix_;
}
void DescribeTo(::std::ostream* os) const {
*os << "starts with ";
UniversalPrint(prefix_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't start with ";
UniversalPrint(prefix_, os);
}
private:
const StringType prefix_;
GTEST_DISALLOW_ASSIGN_(StartsWithMatcher);
};
// Implements the polymorphic EndsWith(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class EndsWithMatcher {
public:
typedef typename StringType::const_pointer ConstCharPointer;
explicit EndsWithMatcher(const StringType& suffix) : suffix_(suffix) {}
// These overloaded methods allow EndsWith(suffix) to be used as a
// Matcher<T> as long as T can be converted to string. Returns true
// iff s ends with suffix_.
bool MatchAndExplain(ConstCharPointer s,
MatchResultListener* listener) const {
return s != NULL && MatchAndExplain(StringType(s), listener);
}
bool MatchAndExplain(const StringType& s,
MatchResultListener* /* listener */) const {
return s.length() >= suffix_.length() &&
s.substr(s.length() - suffix_.length()) == suffix_;
}
void DescribeTo(::std::ostream* os) const {
*os << "ends with ";
UniversalPrint(suffix_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't end with ";
UniversalPrint(suffix_, os);
}
private:
const StringType suffix_;
GTEST_DISALLOW_ASSIGN_(EndsWithMatcher);
};
// Implements polymorphic matchers MatchesRegex(regex) and
// ContainsRegex(regex), which can be used as a Matcher<T> as long as
// T can be converted to a string.
class MatchesRegexMatcher {
public:
MatchesRegexMatcher(const RE* regex, bool full_match)
: regex_(regex), full_match_(full_match) {}
// These overloaded methods allow MatchesRegex(regex) to be used as
// a Matcher<T> as long as T can be converted to string. Returns
// true iff s matches regular expression regex. When full_match_ is
// true, a full match is done; otherwise a partial match is done.
bool MatchAndExplain(const char* s,
MatchResultListener* listener) const {
return s != NULL && MatchAndExplain(internal::string(s), listener);
}
bool MatchAndExplain(const internal::string& s,
MatchResultListener* /* listener */) const {
return full_match_ ? RE::FullMatch(s, *regex_) :
RE::PartialMatch(s, *regex_);
}
void DescribeTo(::std::ostream* os) const {
*os << (full_match_ ? "matches" : "contains")
<< " regular expression ";
UniversalPrinter<internal::string>::Print(regex_->pattern(), os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't " << (full_match_ ? "match" : "contain")
<< " regular expression ";
UniversalPrinter<internal::string>::Print(regex_->pattern(), os);
}
private:
const internal::linked_ptr<const RE> regex_;
const bool full_match_;
GTEST_DISALLOW_ASSIGN_(MatchesRegexMatcher);
};
// Implements a matcher that compares the two fields of a 2-tuple
// using one of the ==, <=, <, etc, operators. The two fields being
// compared don't have to have the same type.
//
// The matcher defined here is polymorphic (for example, Eq() can be
// used to match a tuple<int, short>, a tuple<const long&, double>,
// etc). Therefore we use a template type conversion operator in the
// implementation.
//
// We define this as a macro in order to eliminate duplicated source
// code.
#define GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(name, op, relation) \
class name##2Matcher { \
public: \
template <typename T1, typename T2> \
operator Matcher< ::std::tr1::tuple<T1, T2> >() const { \
return MakeMatcher(new Impl< ::std::tr1::tuple<T1, T2> >); \
} \
template <typename T1, typename T2> \
operator Matcher<const ::std::tr1::tuple<T1, T2>&>() const { \
return MakeMatcher(new Impl<const ::std::tr1::tuple<T1, T2>&>); \
} \
private: \
template <typename Tuple> \
class Impl : public MatcherInterface<Tuple> { \
public: \
virtual bool MatchAndExplain( \
Tuple args, \
MatchResultListener* /* listener */) const { \
return ::std::tr1::get<0>(args) op ::std::tr1::get<1>(args); \
} \
virtual void DescribeTo(::std::ostream* os) const { \
*os << "are " relation; \
} \
virtual void DescribeNegationTo(::std::ostream* os) const { \
*os << "aren't " relation; \
} \
}; \
}
// Implements Eq(), Ge(), Gt(), Le(), Lt(), and Ne() respectively.
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(Eq, ==, "an equal pair");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
Ge, >=, "a pair where the first >= the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
Gt, >, "a pair where the first > the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
Le, <=, "a pair where the first <= the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
Lt, <, "a pair where the first < the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(Ne, !=, "an unequal pair");
#undef GMOCK_IMPLEMENT_COMPARISON2_MATCHER_
// Implements the Not(...) matcher for a particular argument type T.
// We do not nest it inside the NotMatcher class template, as that
// will prevent different instantiations of NotMatcher from sharing
// the same NotMatcherImpl<T> class.
template <typename T>
class NotMatcherImpl : public MatcherInterface<T> {
public:
explicit NotMatcherImpl(const Matcher<T>& matcher)
: matcher_(matcher) {}
virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
return !matcher_.MatchAndExplain(x, listener);
}
virtual void DescribeTo(::std::ostream* os) const {
matcher_.DescribeNegationTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
matcher_.DescribeTo(os);
}
private:
const Matcher<T> matcher_;
GTEST_DISALLOW_ASSIGN_(NotMatcherImpl);
};
// Implements the Not(m) matcher, which matches a value that doesn't
// match matcher m.
template <typename InnerMatcher>
class NotMatcher {
public:
explicit NotMatcher(InnerMatcher matcher) : matcher_(matcher) {}
// This template type conversion operator allows Not(m) to be used
// to match any type m can match.
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new NotMatcherImpl<T>(SafeMatcherCast<T>(matcher_)));
}
private:
InnerMatcher matcher_;
GTEST_DISALLOW_ASSIGN_(NotMatcher);
};
// Implements the AllOf(m1, m2) matcher for a particular argument type
// T. We do not nest it inside the BothOfMatcher class template, as
// that will prevent different instantiations of BothOfMatcher from
// sharing the same BothOfMatcherImpl<T> class.
template <typename T>
class BothOfMatcherImpl : public MatcherInterface<T> {
public:
BothOfMatcherImpl(const Matcher<T>& matcher1, const Matcher<T>& matcher2)
: matcher1_(matcher1), matcher2_(matcher2) {}
virtual void DescribeTo(::std::ostream* os) const {
*os << "(";
matcher1_.DescribeTo(os);
*os << ") and (";
matcher2_.DescribeTo(os);
*os << ")";
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "(";
matcher1_.DescribeNegationTo(os);
*os << ") or (";
matcher2_.DescribeNegationTo(os);
*os << ")";
}
virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
// If either matcher1_ or matcher2_ doesn't match x, we only need
// to explain why one of them fails.
StringMatchResultListener listener1;
if (!matcher1_.MatchAndExplain(x, &listener1)) {
*listener << listener1.str();
return false;
}
StringMatchResultListener listener2;
if (!matcher2_.MatchAndExplain(x, &listener2)) {
*listener << listener2.str();
return false;
}
// Otherwise we need to explain why *both* of them match.
const internal::string s1 = listener1.str();
const internal::string s2 = listener2.str();
if (s1 == "") {
*listener << s2;
} else {
*listener << s1;
if (s2 != "") {
*listener << ", and " << s2;
}
}
return true;
}
private:
const Matcher<T> matcher1_;
const Matcher<T> matcher2_;
GTEST_DISALLOW_ASSIGN_(BothOfMatcherImpl);
};
// Used for implementing the AllOf(m_1, ..., m_n) matcher, which
// matches a value that matches all of the matchers m_1, ..., and m_n.
template <typename Matcher1, typename Matcher2>
class BothOfMatcher {
public:
BothOfMatcher(Matcher1 matcher1, Matcher2 matcher2)
: matcher1_(matcher1), matcher2_(matcher2) {}
// This template type conversion operator allows a
// BothOfMatcher<Matcher1, Matcher2> object to match any type that
// both Matcher1 and Matcher2 can match.
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new BothOfMatcherImpl<T>(SafeMatcherCast<T>(matcher1_),
SafeMatcherCast<T>(matcher2_)));
}
private:
Matcher1 matcher1_;
Matcher2 matcher2_;
GTEST_DISALLOW_ASSIGN_(BothOfMatcher);
};
// Implements the AnyOf(m1, m2) matcher for a particular argument type
// T. We do not nest it inside the AnyOfMatcher class template, as
// that will prevent different instantiations of AnyOfMatcher from
// sharing the same EitherOfMatcherImpl<T> class.
template <typename T>
class EitherOfMatcherImpl : public MatcherInterface<T> {
public:
EitherOfMatcherImpl(const Matcher<T>& matcher1, const Matcher<T>& matcher2)
: matcher1_(matcher1), matcher2_(matcher2) {}
virtual void DescribeTo(::std::ostream* os) const {
*os << "(";
matcher1_.DescribeTo(os);
*os << ") or (";
matcher2_.DescribeTo(os);
*os << ")";
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "(";
matcher1_.DescribeNegationTo(os);
*os << ") and (";
matcher2_.DescribeNegationTo(os);
*os << ")";
}
virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
// If either matcher1_ or matcher2_ matches x, we just need to
// explain why *one* of them matches.
StringMatchResultListener listener1;
if (matcher1_.MatchAndExplain(x, &listener1)) {
*listener << listener1.str();
return true;
}
StringMatchResultListener listener2;
if (matcher2_.MatchAndExplain(x, &listener2)) {
*listener << listener2.str();
return true;
}
// Otherwise we need to explain why *both* of them fail.
const internal::string s1 = listener1.str();
const internal::string s2 = listener2.str();
if (s1 == "") {
*listener << s2;
} else {
*listener << s1;
if (s2 != "") {
*listener << ", and " << s2;
}
}
return false;
}
private:
const Matcher<T> matcher1_;
const Matcher<T> matcher2_;
GTEST_DISALLOW_ASSIGN_(EitherOfMatcherImpl);
};
// Used for implementing the AnyOf(m_1, ..., m_n) matcher, which
// matches a value that matches at least one of the matchers m_1, ...,
// and m_n.
template <typename Matcher1, typename Matcher2>
class EitherOfMatcher {
public:
EitherOfMatcher(Matcher1 matcher1, Matcher2 matcher2)
: matcher1_(matcher1), matcher2_(matcher2) {}
// This template type conversion operator allows a
// EitherOfMatcher<Matcher1, Matcher2> object to match any type that
// both Matcher1 and Matcher2 can match.
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new EitherOfMatcherImpl<T>(
SafeMatcherCast<T>(matcher1_), SafeMatcherCast<T>(matcher2_)));
}
private:
Matcher1 matcher1_;
Matcher2 matcher2_;
GTEST_DISALLOW_ASSIGN_(EitherOfMatcher);
};
// Used for implementing Truly(pred), which turns a predicate into a
// matcher.
template <typename Predicate>
class TrulyMatcher {
public:
explicit TrulyMatcher(Predicate pred) : predicate_(pred) {}
// This method template allows Truly(pred) to be used as a matcher
// for type T where T is the argument type of predicate 'pred'. The
// argument is passed by reference as the predicate may be
// interested in the address of the argument.
template <typename T>
bool MatchAndExplain(T& x, // NOLINT
MatchResultListener* /* listener */) const {
// Without the if-statement, MSVC sometimes warns about converting
// a value to bool (warning 4800).
//
// We cannot write 'return !!predicate_(x);' as that doesn't work
// when predicate_(x) returns a class convertible to bool but
// having no operator!().
if (predicate_(x))
return true;
return false;
}
void DescribeTo(::std::ostream* os) const {
*os << "satisfies the given predicate";
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't satisfy the given predicate";
}
private:
Predicate predicate_;
GTEST_DISALLOW_ASSIGN_(TrulyMatcher);
};
// Used for implementing Matches(matcher), which turns a matcher into
// a predicate.
template <typename M>
class MatcherAsPredicate {
public:
explicit MatcherAsPredicate(M matcher) : matcher_(matcher) {}
// This template operator() allows Matches(m) to be used as a
// predicate on type T where m is a matcher on type T.
//
// The argument x is passed by reference instead of by value, as
// some matcher may be interested in its address (e.g. as in
// Matches(Ref(n))(x)).
template <typename T>
bool operator()(const T& x) const {
// We let matcher_ commit to a particular type here instead of
// when the MatcherAsPredicate object was constructed. This
// allows us to write Matches(m) where m is a polymorphic matcher
// (e.g. Eq(5)).
//
// If we write Matcher<T>(matcher_).Matches(x) here, it won't
// compile when matcher_ has type Matcher<const T&>; if we write
// Matcher<const T&>(matcher_).Matches(x) here, it won't compile
// when matcher_ has type Matcher<T>; if we just write
// matcher_.Matches(x), it won't compile when matcher_ is
// polymorphic, e.g. Eq(5).
//
// MatcherCast<const T&>() is necessary for making the code work
// in all of the above situations.
return MatcherCast<const T&>(matcher_).Matches(x);
}
private:
M matcher_;
GTEST_DISALLOW_ASSIGN_(MatcherAsPredicate);
};
// For implementing ASSERT_THAT() and EXPECT_THAT(). The template
// argument M must be a type that can be converted to a matcher.
template <typename M>
class PredicateFormatterFromMatcher {
public:
explicit PredicateFormatterFromMatcher(const M& m) : matcher_(m) {}
// This template () operator allows a PredicateFormatterFromMatcher
// object to act as a predicate-formatter suitable for using with
// Google Test's EXPECT_PRED_FORMAT1() macro.
template <typename T>
AssertionResult operator()(const char* value_text, const T& x) const {
// We convert matcher_ to a Matcher<const T&> *now* instead of
// when the PredicateFormatterFromMatcher object was constructed,
// as matcher_ may be polymorphic (e.g. NotNull()) and we won't
// know which type to instantiate it to until we actually see the
// type of x here.
//
// We write MatcherCast<const T&>(matcher_) instead of
// Matcher<const T&>(matcher_), as the latter won't compile when
// matcher_ has type Matcher<T> (e.g. An<int>()).
const Matcher<const T&> matcher = MatcherCast<const T&>(matcher_);
StringMatchResultListener listener;
if (MatchPrintAndExplain(x, matcher, &listener))
return AssertionSuccess();
::std::stringstream ss;
ss << "Value of: " << value_text << "\n"
<< "Expected: ";
matcher.DescribeTo(&ss);
ss << "\n Actual: " << listener.str();
return AssertionFailure() << ss.str();
}
private:
const M matcher_;
GTEST_DISALLOW_ASSIGN_(PredicateFormatterFromMatcher);
};
// A helper function for converting a matcher to a predicate-formatter
// without the user needing to explicitly write the type. This is
// used for implementing ASSERT_THAT() and EXPECT_THAT().
template <typename M>
inline PredicateFormatterFromMatcher<M>
MakePredicateFormatterFromMatcher(const M& matcher) {
return PredicateFormatterFromMatcher<M>(matcher);
}
// Implements the polymorphic floating point equality matcher, which
// matches two float values using ULP-based approximation. The
// template is meant to be instantiated with FloatType being either
// float or double.
template <typename FloatType>
class FloatingEqMatcher {
public:
// Constructor for FloatingEqMatcher.
// The matcher's input will be compared with rhs. The matcher treats two
// NANs as equal if nan_eq_nan is true. Otherwise, under IEEE standards,
// equality comparisons between NANs will always return false.
FloatingEqMatcher(FloatType rhs, bool nan_eq_nan) :
rhs_(rhs), nan_eq_nan_(nan_eq_nan) {}
// Implements floating point equality matcher as a Matcher<T>.
template <typename T>
class Impl : public MatcherInterface<T> {
public:
Impl(FloatType rhs, bool nan_eq_nan) :
rhs_(rhs), nan_eq_nan_(nan_eq_nan) {}
virtual bool MatchAndExplain(T value,
MatchResultListener* /* listener */) const {
const FloatingPoint<FloatType> lhs(value), rhs(rhs_);
// Compares NaNs first, if nan_eq_nan_ is true.
if (nan_eq_nan_ && lhs.is_nan()) {
return rhs.is_nan();
}
return lhs.AlmostEquals(rhs);
}
virtual void DescribeTo(::std::ostream* os) const {
// os->precision() returns the previously set precision, which we
// store to restore the ostream to its original configuration
// after outputting.
const ::std::streamsize old_precision = os->precision(
::std::numeric_limits<FloatType>::digits10 + 2);
if (FloatingPoint<FloatType>(rhs_).is_nan()) {
if (nan_eq_nan_) {
*os << "is NaN";
} else {
*os << "never matches";
}
} else {
*os << "is approximately " << rhs_;
}
os->precision(old_precision);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
// As before, get original precision.
const ::std::streamsize old_precision = os->precision(
::std::numeric_limits<FloatType>::digits10 + 2);
if (FloatingPoint<FloatType>(rhs_).is_nan()) {
if (nan_eq_nan_) {
*os << "isn't NaN";
} else {
*os << "is anything";
}
} else {
*os << "isn't approximately " << rhs_;
}
// Restore original precision.
os->precision(old_precision);
}
private:
const FloatType rhs_;
const bool nan_eq_nan_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
// The following 3 type conversion operators allow FloatEq(rhs) and
// NanSensitiveFloatEq(rhs) to be used as a Matcher<float>, a
// Matcher<const float&>, or a Matcher<float&>, but nothing else.
// (While Google's C++ coding style doesn't allow arguments passed
// by non-const reference, we may see them in code not conforming to
// the style. Therefore Google Mock needs to support them.)
operator Matcher<FloatType>() const {
return MakeMatcher(new Impl<FloatType>(rhs_, nan_eq_nan_));
}
operator Matcher<const FloatType&>() const {
return MakeMatcher(new Impl<const FloatType&>(rhs_, nan_eq_nan_));
}
operator Matcher<FloatType&>() const {
return MakeMatcher(new Impl<FloatType&>(rhs_, nan_eq_nan_));
}
private:
const FloatType rhs_;
const bool nan_eq_nan_;
GTEST_DISALLOW_ASSIGN_(FloatingEqMatcher);
};
// Implements the Pointee(m) matcher for matching a pointer whose
// pointee matches matcher m. The pointer can be either raw or smart.
template <typename InnerMatcher>
class PointeeMatcher {
public:
explicit PointeeMatcher(const InnerMatcher& matcher) : matcher_(matcher) {}
// This type conversion operator template allows Pointee(m) to be
// used as a matcher for any pointer type whose pointee type is
// compatible with the inner matcher, where type Pointer can be
// either a raw pointer or a smart pointer.
//
// The reason we do this instead of relying on
// MakePolymorphicMatcher() is that the latter is not flexible
// enough for implementing the DescribeTo() method of Pointee().
template <typename Pointer>
operator Matcher<Pointer>() const {
return MakeMatcher(new Impl<Pointer>(matcher_));
}
private:
// The monomorphic implementation that works for a particular pointer type.
template <typename Pointer>
class Impl : public MatcherInterface<Pointer> {
public:
typedef typename PointeeOf<GTEST_REMOVE_CONST_( // NOLINT
GTEST_REMOVE_REFERENCE_(Pointer))>::type Pointee;
explicit Impl(const InnerMatcher& matcher)
: matcher_(MatcherCast<const Pointee&>(matcher)) {}
virtual void DescribeTo(::std::ostream* os) const {
*os << "points to a value that ";
matcher_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "does not point to a value that ";
matcher_.DescribeTo(os);
}
virtual bool MatchAndExplain(Pointer pointer,
MatchResultListener* listener) const {
if (GetRawPointer(pointer) == NULL)
return false;
*listener << "which points to ";
return MatchPrintAndExplain(*pointer, matcher_, listener);
}
private:
const Matcher<const Pointee&> matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
const InnerMatcher matcher_;
GTEST_DISALLOW_ASSIGN_(PointeeMatcher);
};
// Implements the Field() matcher for matching a field (i.e. member
// variable) of an object.
template <typename Class, typename FieldType>
class FieldMatcher {
public:
FieldMatcher(FieldType Class::*field,
const Matcher<const FieldType&>& matcher)
: field_(field), matcher_(matcher) {}
void DescribeTo(::std::ostream* os) const {
*os << "is an object whose given field ";
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "is an object whose given field ";
matcher_.DescribeNegationTo(os);
}
template <typename T>
bool MatchAndExplain(const T& value, MatchResultListener* listener) const {
return MatchAndExplainImpl(
typename ::testing::internal::
is_pointer<GTEST_REMOVE_CONST_(T)>::type(),
value, listener);
}
private:
// The first argument of MatchAndExplainImpl() is needed to help
// Symbian's C++ compiler choose which overload to use. Its type is
// true_type iff the Field() matcher is used to match a pointer.
bool MatchAndExplainImpl(false_type /* is_not_pointer */, const Class& obj,
MatchResultListener* listener) const {
*listener << "whose given field is ";
return MatchPrintAndExplain(obj.*field_, matcher_, listener);
}
bool MatchAndExplainImpl(true_type /* is_pointer */, const Class* p,
MatchResultListener* listener) const {
if (p == NULL)
return false;
*listener << "which points to an object ";
// Since *p has a field, it must be a class/struct/union type and
// thus cannot be a pointer. Therefore we pass false_type() as
// the first argument.
return MatchAndExplainImpl(false_type(), *p, listener);
}
const FieldType Class::*field_;
const Matcher<const FieldType&> matcher_;
GTEST_DISALLOW_ASSIGN_(FieldMatcher);
};
// Implements the Property() matcher for matching a property
// (i.e. return value of a getter method) of an object.
template <typename Class, typename PropertyType>
class PropertyMatcher {
public:
// The property may have a reference type, so 'const PropertyType&'
// may cause double references and fail to compile. That's why we
// need GTEST_REFERENCE_TO_CONST, which works regardless of
// PropertyType being a reference or not.
typedef GTEST_REFERENCE_TO_CONST_(PropertyType) RefToConstProperty;
PropertyMatcher(PropertyType (Class::*property)() const,
const Matcher<RefToConstProperty>& matcher)
: property_(property), matcher_(matcher) {}
void DescribeTo(::std::ostream* os) const {
*os << "is an object whose given property ";
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "is an object whose given property ";
matcher_.DescribeNegationTo(os);
}
template <typename T>
bool MatchAndExplain(const T&value, MatchResultListener* listener) const {
return MatchAndExplainImpl(
typename ::testing::internal::
is_pointer<GTEST_REMOVE_CONST_(T)>::type(),
value, listener);
}
private:
// The first argument of MatchAndExplainImpl() is needed to help
// Symbian's C++ compiler choose which overload to use. Its type is
// true_type iff the Property() matcher is used to match a pointer.
bool MatchAndExplainImpl(false_type /* is_not_pointer */, const Class& obj,
MatchResultListener* listener) const {
*listener << "whose given property is ";
// Cannot pass the return value (for example, int) to MatchPrintAndExplain,
// which takes a non-const reference as argument.
RefToConstProperty result = (obj.*property_)();
return MatchPrintAndExplain(result, matcher_, listener);
}
bool MatchAndExplainImpl(true_type /* is_pointer */, const Class* p,
MatchResultListener* listener) const {
if (p == NULL)
return false;
*listener << "which points to an object ";
// Since *p has a property method, it must be a class/struct/union
// type and thus cannot be a pointer. Therefore we pass
// false_type() as the first argument.
return MatchAndExplainImpl(false_type(), *p, listener);
}
PropertyType (Class::*property_)() const;
const Matcher<RefToConstProperty> matcher_;
GTEST_DISALLOW_ASSIGN_(PropertyMatcher);
};
// Type traits specifying various features of different functors for ResultOf.
// The default template specifies features for functor objects.
// Functor classes have to typedef argument_type and result_type
// to be compatible with ResultOf.
template <typename Functor>
struct CallableTraits {
typedef typename Functor::result_type ResultType;
typedef Functor StorageType;
static void CheckIsValid(Functor /* functor */) {}
template <typename T>
static ResultType Invoke(Functor f, T arg) { return f(arg); }
};
// Specialization for function pointers.
template <typename ArgType, typename ResType>
struct CallableTraits<ResType(*)(ArgType)> {
typedef ResType ResultType;
typedef ResType(*StorageType)(ArgType);
static void CheckIsValid(ResType(*f)(ArgType)) {
GTEST_CHECK_(f != NULL)
<< "NULL function pointer is passed into ResultOf().";
}
template <typename T>
static ResType Invoke(ResType(*f)(ArgType), T arg) {
return (*f)(arg);
}
};
// Implements the ResultOf() matcher for matching a return value of a
// unary function of an object.
template <typename Callable>
class ResultOfMatcher {
public:
typedef typename CallableTraits<Callable>::ResultType ResultType;
ResultOfMatcher(Callable callable, const Matcher<ResultType>& matcher)
: callable_(callable), matcher_(matcher) {
CallableTraits<Callable>::CheckIsValid(callable_);
}
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new Impl<T>(callable_, matcher_));
}
private:
typedef typename CallableTraits<Callable>::StorageType CallableStorageType;
template <typename T>
class Impl : public MatcherInterface<T> {
public:
Impl(CallableStorageType callable, const Matcher<ResultType>& matcher)
: callable_(callable), matcher_(matcher) {}
virtual void DescribeTo(::std::ostream* os) const {
*os << "is mapped by the given callable to a value that ";
matcher_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "is mapped by the given callable to a value that ";
matcher_.DescribeNegationTo(os);
}
virtual bool MatchAndExplain(T obj, MatchResultListener* listener) const {
*listener << "which is mapped by the given callable to ";
// Cannot pass the return value (for example, int) to
// MatchPrintAndExplain, which takes a non-const reference as argument.
ResultType result =
CallableTraits<Callable>::template Invoke<T>(callable_, obj);
return MatchPrintAndExplain(result, matcher_, listener);
}
private:
// Functors often define operator() as non-const method even though
// they are actualy stateless. But we need to use them even when
// 'this' is a const pointer. It's the user's responsibility not to
// use stateful callables with ResultOf(), which does't guarantee
// how many times the callable will be invoked.
mutable CallableStorageType callable_;
const Matcher<ResultType> matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
}; // class Impl
const CallableStorageType callable_;
const Matcher<ResultType> matcher_;
GTEST_DISALLOW_ASSIGN_(ResultOfMatcher);
};
// Implements an equality matcher for any STL-style container whose elements
// support ==. This matcher is like Eq(), but its failure explanations provide
// more detailed information that is useful when the container is used as a set.
// The failure message reports elements that are in one of the operands but not
// the other. The failure messages do not report duplicate or out-of-order
// elements in the containers (which don't properly matter to sets, but can
// occur if the containers are vectors or lists, for example).
//
// Uses the container's const_iterator, value_type, operator ==,
// begin(), and end().
template <typename Container>
class ContainerEqMatcher {
public:
typedef internal::StlContainerView<Container> View;
typedef typename View::type StlContainer;
typedef typename View::const_reference StlContainerReference;
// We make a copy of rhs in case the elements in it are modified
// after this matcher is created.
explicit ContainerEqMatcher(const Container& rhs) : rhs_(View::Copy(rhs)) {
// Makes sure the user doesn't instantiate this class template
// with a const or reference type.
(void)testing::StaticAssertTypeEq<Container,
GTEST_REMOVE_REFERENCE_AND_CONST_(Container)>();
}
void DescribeTo(::std::ostream* os) const {
*os << "equals ";
UniversalPrint(rhs_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "does not equal ";
UniversalPrint(rhs_, os);
}
template <typename LhsContainer>
bool MatchAndExplain(const LhsContainer& lhs,
MatchResultListener* listener) const {
// GTEST_REMOVE_CONST_() is needed to work around an MSVC 8.0 bug
// that causes LhsContainer to be a const type sometimes.
typedef internal::StlContainerView<GTEST_REMOVE_CONST_(LhsContainer)>
LhsView;
typedef typename LhsView::type LhsStlContainer;
StlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
if (lhs_stl_container == rhs_)
return true;
::std::ostream* const os = listener->stream();
if (os != NULL) {
// Something is different. Check for extra values first.
bool printed_header = false;
for (typename LhsStlContainer::const_iterator it =
lhs_stl_container.begin();
it != lhs_stl_container.end(); ++it) {
if (internal::ArrayAwareFind(rhs_.begin(), rhs_.end(), *it) ==
rhs_.end()) {
if (printed_header) {
*os << ", ";
} else {
*os << "which has these unexpected elements: ";
printed_header = true;
}
UniversalPrint(*it, os);
}
}
// Now check for missing values.
bool printed_header2 = false;
for (typename StlContainer::const_iterator it = rhs_.begin();
it != rhs_.end(); ++it) {
if (internal::ArrayAwareFind(
lhs_stl_container.begin(), lhs_stl_container.end(), *it) ==
lhs_stl_container.end()) {
if (printed_header2) {
*os << ", ";
} else {
*os << (printed_header ? ",\nand" : "which")
<< " doesn't have these expected elements: ";
printed_header2 = true;
}
UniversalPrint(*it, os);
}
}
}
return false;
}
private:
const StlContainer rhs_;
GTEST_DISALLOW_ASSIGN_(ContainerEqMatcher);
};
// Implements Pointwise(tuple_matcher, rhs_container). tuple_matcher
// must be able to be safely cast to Matcher<tuple<const T1&, const
// T2&> >, where T1 and T2 are the types of elements in the LHS
// container and the RHS container respectively.
template <typename TupleMatcher, typename RhsContainer>
class PointwiseMatcher {
public:
typedef internal::StlContainerView<RhsContainer> RhsView;
typedef typename RhsView::type RhsStlContainer;
typedef typename RhsStlContainer::value_type RhsValue;
// Like ContainerEq, we make a copy of rhs in case the elements in
// it are modified after this matcher is created.
PointwiseMatcher(const TupleMatcher& tuple_matcher, const RhsContainer& rhs)
: tuple_matcher_(tuple_matcher), rhs_(RhsView::Copy(rhs)) {
// Makes sure the user doesn't instantiate this class template
// with a const or reference type.
(void)testing::StaticAssertTypeEq<RhsContainer,
GTEST_REMOVE_REFERENCE_AND_CONST_(RhsContainer)>();
}
template <typename LhsContainer>
operator Matcher<LhsContainer>() const {
return MakeMatcher(new Impl<LhsContainer>(tuple_matcher_, rhs_));
}
template <typename LhsContainer>
class Impl : public MatcherInterface<LhsContainer> {
public:
typedef internal::StlContainerView<
GTEST_REMOVE_REFERENCE_AND_CONST_(LhsContainer)> LhsView;
typedef typename LhsView::type LhsStlContainer;
typedef typename LhsView::const_reference LhsStlContainerReference;
typedef typename LhsStlContainer::value_type LhsValue;
// We pass the LHS value and the RHS value to the inner matcher by
// reference, as they may be expensive to copy. We must use tuple
// instead of pair here, as a pair cannot hold references (C++ 98,
// 20.2.2 [lib.pairs]).
typedef std::tr1::tuple<const LhsValue&, const RhsValue&> InnerMatcherArg;
Impl(const TupleMatcher& tuple_matcher, const RhsStlContainer& rhs)
// mono_tuple_matcher_ holds a monomorphic version of the tuple matcher.
: mono_tuple_matcher_(SafeMatcherCast<InnerMatcherArg>(tuple_matcher)),
rhs_(rhs) {}
virtual void DescribeTo(::std::ostream* os) const {
*os << "contains " << rhs_.size()
<< " values, where each value and its corresponding value in ";
UniversalPrinter<RhsStlContainer>::Print(rhs_, os);
*os << " ";
mono_tuple_matcher_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't contain exactly " << rhs_.size()
<< " values, or contains a value x at some index i"
<< " where x and the i-th value of ";
UniversalPrint(rhs_, os);
*os << " ";
mono_tuple_matcher_.DescribeNegationTo(os);
}
virtual bool MatchAndExplain(LhsContainer lhs,
MatchResultListener* listener) const {
LhsStlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
const size_t actual_size = lhs_stl_container.size();
if (actual_size != rhs_.size()) {
*listener << "which contains " << actual_size << " values";
return false;
}
typename LhsStlContainer::const_iterator left = lhs_stl_container.begin();
typename RhsStlContainer::const_iterator right = rhs_.begin();
for (size_t i = 0; i != actual_size; ++i, ++left, ++right) {
const InnerMatcherArg value_pair(*left, *right);
if (listener->IsInterested()) {
StringMatchResultListener inner_listener;
if (!mono_tuple_matcher_.MatchAndExplain(
value_pair, &inner_listener)) {
*listener << "where the value pair (";
UniversalPrint(*left, listener->stream());
*listener << ", ";
UniversalPrint(*right, listener->stream());
*listener << ") at index #" << i << " don't match";
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return false;
}
} else {
if (!mono_tuple_matcher_.Matches(value_pair))
return false;
}
}
return true;
}
private:
const Matcher<InnerMatcherArg> mono_tuple_matcher_;
const RhsStlContainer rhs_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
private:
const TupleMatcher tuple_matcher_;
const RhsStlContainer rhs_;
GTEST_DISALLOW_ASSIGN_(PointwiseMatcher);
};
// Holds the logic common to ContainsMatcherImpl and EachMatcherImpl.
template <typename Container>
class QuantifierMatcherImpl : public MatcherInterface<Container> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
typedef StlContainerView<RawContainer> View;
typedef typename View::type StlContainer;
typedef typename View::const_reference StlContainerReference;
typedef typename StlContainer::value_type Element;
template <typename InnerMatcher>
explicit QuantifierMatcherImpl(InnerMatcher inner_matcher)
: inner_matcher_(
testing::SafeMatcherCast<const Element&>(inner_matcher)) {}
// Checks whether:
// * All elements in the container match, if all_elements_should_match.
// * Any element in the container matches, if !all_elements_should_match.
bool MatchAndExplainImpl(bool all_elements_should_match,
Container container,
MatchResultListener* listener) const {
StlContainerReference stl_container = View::ConstReference(container);
size_t i = 0;
for (typename StlContainer::const_iterator it = stl_container.begin();
it != stl_container.end(); ++it, ++i) {
StringMatchResultListener inner_listener;
const bool matches = inner_matcher_.MatchAndExplain(*it, &inner_listener);
if (matches != all_elements_should_match) {
*listener << "whose element #" << i
<< (matches ? " matches" : " doesn't match");
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return !all_elements_should_match;
}
}
return all_elements_should_match;
}
protected:
const Matcher<const Element&> inner_matcher_;
GTEST_DISALLOW_ASSIGN_(QuantifierMatcherImpl);
};
// Implements Contains(element_matcher) for the given argument type Container.
// Symmetric to EachMatcherImpl.
template <typename Container>
class ContainsMatcherImpl : public QuantifierMatcherImpl<Container> {
public:
template <typename InnerMatcher>
explicit ContainsMatcherImpl(InnerMatcher inner_matcher)
: QuantifierMatcherImpl<Container>(inner_matcher) {}
// Describes what this matcher does.
virtual void DescribeTo(::std::ostream* os) const {
*os << "contains at least one element that ";
this->inner_matcher_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't contain any element that ";
this->inner_matcher_.DescribeTo(os);
}
virtual bool MatchAndExplain(Container container,
MatchResultListener* listener) const {
return this->MatchAndExplainImpl(false, container, listener);
}
private:
GTEST_DISALLOW_ASSIGN_(ContainsMatcherImpl);
};
// Implements Each(element_matcher) for the given argument type Container.
// Symmetric to ContainsMatcherImpl.
template <typename Container>
class EachMatcherImpl : public QuantifierMatcherImpl<Container> {
public:
template <typename InnerMatcher>
explicit EachMatcherImpl(InnerMatcher inner_matcher)
: QuantifierMatcherImpl<Container>(inner_matcher) {}
// Describes what this matcher does.
virtual void DescribeTo(::std::ostream* os) const {
*os << "only contains elements that ";
this->inner_matcher_.DescribeTo(os);
}
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "contains some element that ";
this->inner_matcher_.DescribeNegationTo(os);
}
virtual bool MatchAndExplain(Container container,
MatchResultListener* listener) const {
return this->MatchAndExplainImpl(true, container, listener);
}
private:
GTEST_DISALLOW_ASSIGN_(EachMatcherImpl);
};
// Implements polymorphic Contains(element_matcher).
template <typename M>
class ContainsMatcher {
public:
explicit ContainsMatcher(M m) : inner_matcher_(m) {}
template <typename Container>
operator Matcher<Container>() const {
return MakeMatcher(new ContainsMatcherImpl<Container>(inner_matcher_));
}
private:
const M inner_matcher_;
GTEST_DISALLOW_ASSIGN_(ContainsMatcher);
};
// Implements polymorphic Each(element_matcher).
template <typename M>
class EachMatcher {
public:
explicit EachMatcher(M m) : inner_matcher_(m) {}
template <typename Container>
operator Matcher<Container>() const {
return MakeMatcher(new EachMatcherImpl<Container>(inner_matcher_));
}
private:
const M inner_matcher_;
GTEST_DISALLOW_ASSIGN_(EachMatcher);
};
// Implements Key(inner_matcher) for the given argument pair type.
// Key(inner_matcher) matches an std::pair whose 'first' field matches
// inner_matcher. For example, Contains(Key(Ge(5))) can be used to match an
// std::map that contains at least one element whose key is >= 5.
template <typename PairType>
class KeyMatcherImpl : public MatcherInterface<PairType> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(PairType) RawPairType;
typedef typename RawPairType::first_type KeyType;
template <typename InnerMatcher>
explicit KeyMatcherImpl(InnerMatcher inner_matcher)
: inner_matcher_(
testing::SafeMatcherCast<const KeyType&>(inner_matcher)) {
}
// Returns true iff 'key_value.first' (the key) matches the inner matcher.
virtual bool MatchAndExplain(PairType key_value,
MatchResultListener* listener) const {
StringMatchResultListener inner_listener;
const bool match = inner_matcher_.MatchAndExplain(key_value.first,
&inner_listener);
const internal::string explanation = inner_listener.str();
if (explanation != "") {
*listener << "whose first field is a value " << explanation;
}
return match;
}
// Describes what this matcher does.
virtual void DescribeTo(::std::ostream* os) const {
*os << "has a key that ";
inner_matcher_.DescribeTo(os);
}
// Describes what the negation of this matcher does.
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't have a key that ";
inner_matcher_.DescribeTo(os);
}
private:
const Matcher<const KeyType&> inner_matcher_;
GTEST_DISALLOW_ASSIGN_(KeyMatcherImpl);
};
// Implements polymorphic Key(matcher_for_key).
template <typename M>
class KeyMatcher {
public:
explicit KeyMatcher(M m) : matcher_for_key_(m) {}
template <typename PairType>
operator Matcher<PairType>() const {
return MakeMatcher(new KeyMatcherImpl<PairType>(matcher_for_key_));
}
private:
const M matcher_for_key_;
GTEST_DISALLOW_ASSIGN_(KeyMatcher);
};
// Implements Pair(first_matcher, second_matcher) for the given argument pair
// type with its two matchers. See Pair() function below.
template <typename PairType>
class PairMatcherImpl : public MatcherInterface<PairType> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(PairType) RawPairType;
typedef typename RawPairType::first_type FirstType;
typedef typename RawPairType::second_type SecondType;
template <typename FirstMatcher, typename SecondMatcher>
PairMatcherImpl(FirstMatcher first_matcher, SecondMatcher second_matcher)
: first_matcher_(
testing::SafeMatcherCast<const FirstType&>(first_matcher)),
second_matcher_(
testing::SafeMatcherCast<const SecondType&>(second_matcher)) {
}
// Describes what this matcher does.
virtual void DescribeTo(::std::ostream* os) const {
*os << "has a first field that ";
first_matcher_.DescribeTo(os);
*os << ", and has a second field that ";
second_matcher_.DescribeTo(os);
}
// Describes what the negation of this matcher does.
virtual void DescribeNegationTo(::std::ostream* os) const {
*os << "has a first field that ";
first_matcher_.DescribeNegationTo(os);
*os << ", or has a second field that ";
second_matcher_.DescribeNegationTo(os);
}
// Returns true iff 'a_pair.first' matches first_matcher and 'a_pair.second'
// matches second_matcher.
virtual bool MatchAndExplain(PairType a_pair,
MatchResultListener* listener) const {
if (!listener->IsInterested()) {
// If the listener is not interested, we don't need to construct the
// explanation.
return first_matcher_.Matches(a_pair.first) &&
second_matcher_.Matches(a_pair.second);
}
StringMatchResultListener first_inner_listener;
if (!first_matcher_.MatchAndExplain(a_pair.first,
&first_inner_listener)) {
*listener << "whose first field does not match";
PrintIfNotEmpty(first_inner_listener.str(), listener->stream());
return false;
}
StringMatchResultListener second_inner_listener;
if (!second_matcher_.MatchAndExplain(a_pair.second,
&second_inner_listener)) {
*listener << "whose second field does not match";
PrintIfNotEmpty(second_inner_listener.str(), listener->stream());
return false;
}
ExplainSuccess(first_inner_listener.str(), second_inner_listener.str(),
listener);
return true;
}
private:
void ExplainSuccess(const internal::string& first_explanation,
const internal::string& second_explanation,
MatchResultListener* listener) const {
*listener << "whose both fields match";
if (first_explanation != "") {
*listener << ", where the first field is a value " << first_explanation;
}
if (second_explanation != "") {
*listener << ", ";
if (first_explanation != "") {
*listener << "and ";
} else {
*listener << "where ";
}
*listener << "the second field is a value " << second_explanation;
}
}
const Matcher<const FirstType&> first_matcher_;
const Matcher<const SecondType&> second_matcher_;
GTEST_DISALLOW_ASSIGN_(PairMatcherImpl);
};
// Implements polymorphic Pair(first_matcher, second_matcher).
template <typename FirstMatcher, typename SecondMatcher>
class PairMatcher {
public:
PairMatcher(FirstMatcher first_matcher, SecondMatcher second_matcher)
: first_matcher_(first_matcher), second_matcher_(second_matcher) {}
template <typename PairType>
operator Matcher<PairType> () const {
return MakeMatcher(
new PairMatcherImpl<PairType>(
first_matcher_, second_matcher_));
}
private:
const FirstMatcher first_matcher_;
const SecondMatcher second_matcher_;
GTEST_DISALLOW_ASSIGN_(PairMatcher);
};
// Implements ElementsAre() and ElementsAreArray().
template <typename Container>
class ElementsAreMatcherImpl : public MatcherInterface<Container> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
typedef internal::StlContainerView<RawContainer> View;
typedef typename View::type StlContainer;
typedef typename View::const_reference StlContainerReference;
typedef typename StlContainer::value_type Element;
// Constructs the matcher from a sequence of element values or
// element matchers.
template <typename InputIter>
ElementsAreMatcherImpl(InputIter first, size_t a_count) {
matchers_.reserve(a_count);
InputIter it = first;
for (size_t i = 0; i != a_count; ++i, ++it) {
matchers_.push_back(MatcherCast<const Element&>(*it));
}
}
// Describes what this matcher does.
virtual void DescribeTo(::std::ostream* os) const {
if (count() == 0) {
*os << "is empty";
} else if (count() == 1) {
*os << "has 1 element that ";
matchers_[0].DescribeTo(os);
} else {
*os << "has " << Elements(count()) << " where\n";
for (size_t i = 0; i != count(); ++i) {
*os << "element #" << i << " ";
matchers_[i].DescribeTo(os);
if (i + 1 < count()) {
*os << ",\n";
}
}
}
}
// Describes what the negation of this matcher does.
virtual void DescribeNegationTo(::std::ostream* os) const {
if (count() == 0) {
*os << "isn't empty";
return;
}
*os << "doesn't have " << Elements(count()) << ", or\n";
for (size_t i = 0; i != count(); ++i) {
*os << "element #" << i << " ";
matchers_[i].DescribeNegationTo(os);
if (i + 1 < count()) {
*os << ", or\n";
}
}
}
virtual bool MatchAndExplain(Container container,
MatchResultListener* listener) const {
StlContainerReference stl_container = View::ConstReference(container);
const size_t actual_count = stl_container.size();
if (actual_count != count()) {
// The element count doesn't match. If the container is empty,
// there's no need to explain anything as Google Mock already
// prints the empty container. Otherwise we just need to show
// how many elements there actually are.
if (actual_count != 0) {
*listener << "which has " << Elements(actual_count);
}
return false;
}
typename StlContainer::const_iterator it = stl_container.begin();
// explanations[i] is the explanation of the element at index i.
std::vector<internal::string> explanations(count());
for (size_t i = 0; i != count(); ++it, ++i) {
StringMatchResultListener s;
if (matchers_[i].MatchAndExplain(*it, &s)) {
explanations[i] = s.str();
} else {
// The container has the right size but the i-th element
// doesn't match its expectation.
*listener << "whose element #" << i << " doesn't match";
PrintIfNotEmpty(s.str(), listener->stream());
return false;
}
}
// Every element matches its expectation. We need to explain why
// (the obvious ones can be skipped).
bool reason_printed = false;
for (size_t i = 0; i != count(); ++i) {
const internal::string& s = explanations[i];
if (!s.empty()) {
if (reason_printed) {
*listener << ",\nand ";
}
*listener << "whose element #" << i << " matches, " << s;
reason_printed = true;
}
}
return true;
}
private:
static Message Elements(size_t count) {
return Message() << count << (count == 1 ? " element" : " elements");
}
size_t count() const { return matchers_.size(); }
std::vector<Matcher<const Element&> > matchers_;
GTEST_DISALLOW_ASSIGN_(ElementsAreMatcherImpl);
};
// Implements ElementsAre() of 0 arguments.
class ElementsAreMatcher0 {
public:
ElementsAreMatcher0() {}
template <typename Container>
operator Matcher<Container>() const {
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
typedef typename internal::StlContainerView<RawContainer>::type::value_type
Element;
const Matcher<const Element&>* const matchers = NULL;
return MakeMatcher(new ElementsAreMatcherImpl<Container>(matchers, 0));
}
};
// Implements ElementsAreArray().
template <typename T>
class ElementsAreArrayMatcher {
public:
ElementsAreArrayMatcher(const T* first, size_t count) :
first_(first), count_(count) {}
template <typename Container>
operator Matcher<Container>() const {
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
typedef typename internal::StlContainerView<RawContainer>::type::value_type
Element;
return MakeMatcher(new ElementsAreMatcherImpl<Container>(first_, count_));
}
private:
const T* const first_;
const size_t count_;
GTEST_DISALLOW_ASSIGN_(ElementsAreArrayMatcher);
};
// Returns the description for a matcher defined using the MATCHER*()
// macro where the user-supplied description string is "", if
// 'negation' is false; otherwise returns the description of the
// negation of the matcher. 'param_values' contains a list of strings
// that are the print-out of the matcher's parameters.
string FormatMatcherDescription(bool negation, const char* matcher_name,
const Strings& param_values);
} // namespace internal
// Implements MatcherCast().
template <typename T, typename M>
inline Matcher<T> MatcherCast(M matcher) {
return internal::MatcherCastImpl<T, M>::Cast(matcher);
}
// _ is a matcher that matches anything of any type.
//
// This definition is fine as:
//
// 1. The C++ standard permits using the name _ in a namespace that
// is not the global namespace or ::std.
// 2. The AnythingMatcher class has no data member or constructor,
// so it's OK to create global variables of this type.
// 3. c-style has approved of using _ in this case.
const internal::AnythingMatcher _ = {};
// Creates a matcher that matches any value of the given type T.
template <typename T>
inline Matcher<T> A() { return MakeMatcher(new internal::AnyMatcherImpl<T>()); }
// Creates a matcher that matches any value of the given type T.
template <typename T>
inline Matcher<T> An() { return A<T>(); }
// Creates a polymorphic matcher that matches anything equal to x.
// Note: if the parameter of Eq() were declared as const T&, Eq("foo")
// wouldn't compile.
template <typename T>
inline internal::EqMatcher<T> Eq(T x) { return internal::EqMatcher<T>(x); }
// Constructs a Matcher<T> from a 'value' of type T. The constructed
// matcher matches any value that's equal to 'value'.
template <typename T>
Matcher<T>::Matcher(T value) { *this = Eq(value); }
// Creates a monomorphic matcher that matches anything with type Lhs
// and equal to rhs. A user may need to use this instead of Eq(...)
// in order to resolve an overloading ambiguity.
//
// TypedEq<T>(x) is just a convenient short-hand for Matcher<T>(Eq(x))
// or Matcher<T>(x), but more readable than the latter.
//
// We could define similar monomorphic matchers for other comparison
// operations (e.g. TypedLt, TypedGe, and etc), but decided not to do
// it yet as those are used much less than Eq() in practice. A user
// can always write Matcher<T>(Lt(5)) to be explicit about the type,
// for example.
template <typename Lhs, typename Rhs>
inline Matcher<Lhs> TypedEq(const Rhs& rhs) { return Eq(rhs); }
// Creates a polymorphic matcher that matches anything >= x.
template <typename Rhs>
inline internal::GeMatcher<Rhs> Ge(Rhs x) {
return internal::GeMatcher<Rhs>(x);
}
// Creates a polymorphic matcher that matches anything > x.
template <typename Rhs>
inline internal::GtMatcher<Rhs> Gt(Rhs x) {
return internal::GtMatcher<Rhs>(x);
}
// Creates a polymorphic matcher that matches anything <= x.
template <typename Rhs>
inline internal::LeMatcher<Rhs> Le(Rhs x) {
return internal::LeMatcher<Rhs>(x);
}
// Creates a polymorphic matcher that matches anything < x.
template <typename Rhs>
inline internal::LtMatcher<Rhs> Lt(Rhs x) {
return internal::LtMatcher<Rhs>(x);
}
// Creates a polymorphic matcher that matches anything != x.
template <typename Rhs>
inline internal::NeMatcher<Rhs> Ne(Rhs x) {
return internal::NeMatcher<Rhs>(x);
}
// Creates a polymorphic matcher that matches any NULL pointer.
inline PolymorphicMatcher<internal::IsNullMatcher > IsNull() {
return MakePolymorphicMatcher(internal::IsNullMatcher());
}
// Creates a polymorphic matcher that matches any non-NULL pointer.
// This is convenient as Not(NULL) doesn't compile (the compiler
// thinks that that expression is comparing a pointer with an integer).
inline PolymorphicMatcher<internal::NotNullMatcher > NotNull() {
return Ma