| // <functional> -*- C++ -*- |
| |
| // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| // Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /* |
| * Copyright (c) 1997 |
| * Silicon Graphics Computer Systems, Inc. |
| * |
| * Permission to use, copy, modify, distribute and sell this software |
| * and its documentation for any purpose is hereby granted without fee, |
| * provided that the above copyright notice appear in all copies and |
| * that both that copyright notice and this permission notice appear |
| * in supporting documentation. Silicon Graphics makes no |
| * representations about the suitability of this software for any |
| * purpose. It is provided "as is" without express or implied warranty. |
| * |
| */ |
| |
| /** @file include/functional |
| * This is a Standard C++ Library header. |
| */ |
| |
| #ifndef _GLIBCXX_FUNCTIONAL |
| #define _GLIBCXX_FUNCTIONAL 1 |
| |
| #pragma GCC system_header |
| |
| #include <bits/c++config.h> |
| #include <bits/stl_function.h> |
| |
| #ifdef __GXX_EXPERIMENTAL_CXX0X__ |
| |
| #include <typeinfo> |
| #include <new> |
| #include <tuple> |
| #include <type_traits> |
| #include <bits/functexcept.h> |
| #include <bits/functional_hash.h> |
| |
| namespace std |
| { |
| template<typename _MemberPointer> |
| class _Mem_fn; |
| |
| /** |
| * Actual implementation of _Has_result_type, which uses SFINAE to |
| * determine if the type _Tp has a publicly-accessible member type |
| * result_type. |
| */ |
| template<typename _Tp> |
| class _Has_result_type_helper : __sfinae_types |
| { |
| template<typename _Up> |
| struct _Wrap_type |
| { }; |
| |
| template<typename _Up> |
| static __one __test(_Wrap_type<typename _Up::result_type>*); |
| |
| template<typename _Up> |
| static __two __test(...); |
| |
| public: |
| static const bool value = sizeof(__test<_Tp>(0)) == 1; |
| }; |
| |
| template<typename _Tp> |
| struct _Has_result_type |
| : integral_constant<bool, |
| _Has_result_type_helper<typename remove_cv<_Tp>::type>::value> |
| { }; |
| |
| /// If we have found a result_type, extract it. |
| template<bool _Has_result_type, typename _Functor> |
| struct _Maybe_get_result_type |
| { }; |
| |
| template<typename _Functor> |
| struct _Maybe_get_result_type<true, _Functor> |
| { |
| typedef typename _Functor::result_type result_type; |
| }; |
| |
| /** |
| * Base class for any function object that has a weak result type, as |
| * defined in 3.3/3 of TR1. |
| */ |
| template<typename _Functor> |
| struct _Weak_result_type_impl |
| : _Maybe_get_result_type<_Has_result_type<_Functor>::value, _Functor> |
| { }; |
| |
| /// Retrieve the result type for a function type. |
| template<typename _Res, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res(_ArgTypes...)> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /// Retrieve the result type for a function reference. |
| template<typename _Res, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /// Retrieve the result type for a function pointer. |
| template<typename _Res, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /// Retrieve result type for a member function pointer. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /// Retrieve result type for a const member function pointer. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /// Retrieve result type for a volatile member function pointer. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /// Retrieve result type for a const volatile member function pointer. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)const volatile> |
| { |
| typedef _Res result_type; |
| }; |
| |
| /** |
| * Strip top-level cv-qualifiers from the function object and let |
| * _Weak_result_type_impl perform the real work. |
| */ |
| template<typename _Functor> |
| struct _Weak_result_type |
| : _Weak_result_type_impl<typename remove_cv<_Functor>::type> |
| { }; |
| |
| template<typename _Signature> |
| class result_of; |
| |
| template<typename _Functor, typename... _ArgTypes> |
| struct result_of<_Functor(_ArgTypes...)> |
| { |
| typedef |
| decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) ) |
| type; |
| }; |
| |
| /// Determines if the type _Tp derives from unary_function. |
| template<typename _Tp> |
| struct _Derives_from_unary_function : __sfinae_types |
| { |
| private: |
| template<typename _T1, typename _Res> |
| static __one __test(const volatile unary_function<_T1, _Res>*); |
| |
| // It's tempting to change "..." to const volatile void*, but |
| // that fails when _Tp is a function type. |
| static __two __test(...); |
| |
| public: |
| static const bool value = sizeof(__test((_Tp*)0)) == 1; |
| }; |
| |
| /// Determines if the type _Tp derives from binary_function. |
| template<typename _Tp> |
| struct _Derives_from_binary_function : __sfinae_types |
| { |
| private: |
| template<typename _T1, typename _T2, typename _Res> |
| static __one __test(const volatile binary_function<_T1, _T2, _Res>*); |
| |
| // It's tempting to change "..." to const volatile void*, but |
| // that fails when _Tp is a function type. |
| static __two __test(...); |
| |
| public: |
| static const bool value = sizeof(__test((_Tp*)0)) == 1; |
| }; |
| |
| /// Turns a function type into a function pointer type |
| template<typename _Tp, bool _IsFunctionType = is_function<_Tp>::value> |
| struct _Function_to_function_pointer |
| { |
| typedef _Tp type; |
| }; |
| |
| template<typename _Tp> |
| struct _Function_to_function_pointer<_Tp, true> |
| { |
| typedef _Tp* type; |
| }; |
| |
| /** |
| * Invoke a function object, which may be either a member pointer or a |
| * function object. The first parameter will tell which. |
| */ |
| template<typename _Functor, typename... _Args> |
| inline |
| typename enable_if< |
| (!is_member_pointer<_Functor>::value |
| && !is_function<_Functor>::value |
| && !is_function<typename remove_pointer<_Functor>::type>::value), |
| typename result_of<_Functor(_Args...)>::type |
| >::type |
| __invoke(_Functor& __f, _Args&&... __args) |
| { |
| return __f(std::forward<_Args>(__args)...); |
| } |
| |
| // To pick up function references (that will become function pointers) |
| template<typename _Functor, typename... _Args> |
| inline |
| typename enable_if< |
| (is_pointer<_Functor>::value |
| && is_function<typename remove_pointer<_Functor>::type>::value), |
| typename result_of<_Functor(_Args...)>::type |
| >::type |
| __invoke(_Functor __f, _Args&&... __args) |
| { |
| return __f(std::forward<_Args>(__args)...); |
| } |
| |
| /** |
| * Knowing which of unary_function and binary_function _Tp derives |
| * from, derives from the same and ensures that reference_wrapper |
| * will have a weak result type. See cases below. |
| */ |
| template<bool _Unary, bool _Binary, typename _Tp> |
| struct _Reference_wrapper_base_impl; |
| |
| // Not a unary_function or binary_function, so try a weak result type. |
| template<typename _Tp> |
| struct _Reference_wrapper_base_impl<false, false, _Tp> |
| : _Weak_result_type<_Tp> |
| { }; |
| |
| // unary_function but not binary_function |
| template<typename _Tp> |
| struct _Reference_wrapper_base_impl<true, false, _Tp> |
| : unary_function<typename _Tp::argument_type, |
| typename _Tp::result_type> |
| { }; |
| |
| // binary_function but not unary_function |
| template<typename _Tp> |
| struct _Reference_wrapper_base_impl<false, true, _Tp> |
| : binary_function<typename _Tp::first_argument_type, |
| typename _Tp::second_argument_type, |
| typename _Tp::result_type> |
| { }; |
| |
| // Both unary_function and binary_function. Import result_type to |
| // avoid conflicts. |
| template<typename _Tp> |
| struct _Reference_wrapper_base_impl<true, true, _Tp> |
| : unary_function<typename _Tp::argument_type, |
| typename _Tp::result_type>, |
| binary_function<typename _Tp::first_argument_type, |
| typename _Tp::second_argument_type, |
| typename _Tp::result_type> |
| { |
| typedef typename _Tp::result_type result_type; |
| }; |
| |
| /** |
| * Derives from unary_function or binary_function when it |
| * can. Specializations handle all of the easy cases. The primary |
| * template determines what to do with a class type, which may |
| * derive from both unary_function and binary_function. |
| */ |
| template<typename _Tp> |
| struct _Reference_wrapper_base |
| : _Reference_wrapper_base_impl< |
| _Derives_from_unary_function<_Tp>::value, |
| _Derives_from_binary_function<_Tp>::value, |
| _Tp> |
| { }; |
| |
| // - a function type (unary) |
| template<typename _Res, typename _T1> |
| struct _Reference_wrapper_base<_Res(_T1)> |
| : unary_function<_T1, _Res> |
| { }; |
| |
| // - a function type (binary) |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Reference_wrapper_base<_Res(_T1, _T2)> |
| : binary_function<_T1, _T2, _Res> |
| { }; |
| |
| // - a function pointer type (unary) |
| template<typename _Res, typename _T1> |
| struct _Reference_wrapper_base<_Res(*)(_T1)> |
| : unary_function<_T1, _Res> |
| { }; |
| |
| // - a function pointer type (binary) |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Reference_wrapper_base<_Res(*)(_T1, _T2)> |
| : binary_function<_T1, _T2, _Res> |
| { }; |
| |
| // - a pointer to member function type (unary, no qualifiers) |
| template<typename _Res, typename _T1> |
| struct _Reference_wrapper_base<_Res (_T1::*)()> |
| : unary_function<_T1*, _Res> |
| { }; |
| |
| // - a pointer to member function type (binary, no qualifiers) |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Reference_wrapper_base<_Res (_T1::*)(_T2)> |
| : binary_function<_T1*, _T2, _Res> |
| { }; |
| |
| // - a pointer to member function type (unary, const) |
| template<typename _Res, typename _T1> |
| struct _Reference_wrapper_base<_Res (_T1::*)() const> |
| : unary_function<const _T1*, _Res> |
| { }; |
| |
| // - a pointer to member function type (binary, const) |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const> |
| : binary_function<const _T1*, _T2, _Res> |
| { }; |
| |
| // - a pointer to member function type (unary, volatile) |
| template<typename _Res, typename _T1> |
| struct _Reference_wrapper_base<_Res (_T1::*)() volatile> |
| : unary_function<volatile _T1*, _Res> |
| { }; |
| |
| // - a pointer to member function type (binary, volatile) |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile> |
| : binary_function<volatile _T1*, _T2, _Res> |
| { }; |
| |
| // - a pointer to member function type (unary, const volatile) |
| template<typename _Res, typename _T1> |
| struct _Reference_wrapper_base<_Res (_T1::*)() const volatile> |
| : unary_function<const volatile _T1*, _Res> |
| { }; |
| |
| // - a pointer to member function type (binary, const volatile) |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile> |
| : binary_function<const volatile _T1*, _T2, _Res> |
| { }; |
| |
| /** |
| * @brief Primary class template for reference_wrapper. |
| * @ingroup functors |
| * @{ |
| */ |
| template<typename _Tp> |
| class reference_wrapper |
| : public _Reference_wrapper_base<typename remove_cv<_Tp>::type> |
| { |
| // If _Tp is a function type, we can't form result_of<_Tp(...)>, |
| // so turn it into a function pointer type. |
| typedef typename _Function_to_function_pointer<_Tp>::type |
| _M_func_type; |
| |
| _Tp* _M_data; |
| public: |
| typedef _Tp type; |
| |
| reference_wrapper(_Tp& __indata): _M_data(&__indata) |
| { } |
| |
| reference_wrapper(_Tp&&) = delete; |
| |
| reference_wrapper(const reference_wrapper<_Tp>& __inref): |
| _M_data(__inref._M_data) |
| { } |
| |
| reference_wrapper& |
| operator=(const reference_wrapper<_Tp>& __inref) |
| { |
| _M_data = __inref._M_data; |
| return *this; |
| } |
| |
| operator _Tp&() const |
| { return this->get(); } |
| |
| _Tp& |
| get() const |
| { return *_M_data; } |
| |
| template<typename... _Args> |
| typename result_of<_M_func_type(_Args...)>::type |
| operator()(_Args&&... __args) const |
| { |
| return __invoke(get(), std::forward<_Args>(__args)...); |
| } |
| }; |
| |
| |
| /// Denotes a reference should be taken to a variable. |
| template<typename _Tp> |
| inline reference_wrapper<_Tp> |
| ref(_Tp& __t) |
| { return reference_wrapper<_Tp>(__t); } |
| |
| /// Denotes a const reference should be taken to a variable. |
| template<typename _Tp> |
| inline reference_wrapper<const _Tp> |
| cref(const _Tp& __t) |
| { return reference_wrapper<const _Tp>(__t); } |
| |
| /// Partial specialization. |
| template<typename _Tp> |
| inline reference_wrapper<_Tp> |
| ref(reference_wrapper<_Tp> __t) |
| { return ref(__t.get()); } |
| |
| /// Partial specialization. |
| template<typename _Tp> |
| inline reference_wrapper<const _Tp> |
| cref(reference_wrapper<_Tp> __t) |
| { return cref(__t.get()); } |
| |
| // @} group functors |
| |
| template<typename _Tp, bool> |
| struct _Mem_fn_const_or_non |
| { |
| typedef const _Tp& type; |
| }; |
| |
| template<typename _Tp> |
| struct _Mem_fn_const_or_non<_Tp, false> |
| { |
| typedef _Tp& type; |
| }; |
| |
| /** |
| * Derives from @c unary_function or @c binary_function, or perhaps |
| * nothing, depending on the number of arguments provided. The |
| * primary template is the basis case, which derives nothing. |
| */ |
| template<typename _Res, typename... _ArgTypes> |
| struct _Maybe_unary_or_binary_function { }; |
| |
| /// Derives from @c unary_function, as appropriate. |
| template<typename _Res, typename _T1> |
| struct _Maybe_unary_or_binary_function<_Res, _T1> |
| : std::unary_function<_T1, _Res> { }; |
| |
| /// Derives from @c binary_function, as appropriate. |
| template<typename _Res, typename _T1, typename _T2> |
| struct _Maybe_unary_or_binary_function<_Res, _T1, _T2> |
| : std::binary_function<_T1, _T2, _Res> { }; |
| |
| /// Implementation of @c mem_fn for member function pointers. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| class _Mem_fn<_Res (_Class::*)(_ArgTypes...)> |
| : public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...> |
| { |
| typedef _Res (_Class::*_Functor)(_ArgTypes...); |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __object, const volatile _Class *, |
| _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const |
| { return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| public: |
| typedef _Res result_type; |
| |
| explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } |
| |
| // Handle objects |
| _Res |
| operator()(_Class& __object, _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle pointers |
| _Res |
| operator()(_Class* __object, _ArgTypes... __args) const |
| { return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle smart pointers, references and pointers to derived |
| template<typename _Tp> |
| _Res |
| operator()(_Tp& __object, _ArgTypes... __args) const |
| { |
| return _M_call(__object, &__object, |
| std::forward<_ArgTypes>(__args)...); |
| } |
| |
| private: |
| _Functor __pmf; |
| }; |
| |
| /// Implementation of @c mem_fn for const member function pointers. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const> |
| : public _Maybe_unary_or_binary_function<_Res, const _Class*, |
| _ArgTypes...> |
| { |
| typedef _Res (_Class::*_Functor)(_ArgTypes...) const; |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __object, const volatile _Class *, |
| _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const |
| { return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| public: |
| typedef _Res result_type; |
| |
| explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } |
| |
| // Handle objects |
| _Res |
| operator()(const _Class& __object, _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle pointers |
| _Res |
| operator()(const _Class* __object, _ArgTypes... __args) const |
| { return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle smart pointers, references and pointers to derived |
| template<typename _Tp> |
| _Res operator()(_Tp& __object, _ArgTypes... __args) const |
| { |
| return _M_call(__object, &__object, |
| std::forward<_ArgTypes>(__args)...); |
| } |
| |
| private: |
| _Functor __pmf; |
| }; |
| |
| /// Implementation of @c mem_fn for volatile member function pointers. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile> |
| : public _Maybe_unary_or_binary_function<_Res, volatile _Class*, |
| _ArgTypes...> |
| { |
| typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile; |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __object, const volatile _Class *, |
| _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const |
| { return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| public: |
| typedef _Res result_type; |
| |
| explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } |
| |
| // Handle objects |
| _Res |
| operator()(volatile _Class& __object, _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle pointers |
| _Res |
| operator()(volatile _Class* __object, _ArgTypes... __args) const |
| { return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle smart pointers, references and pointers to derived |
| template<typename _Tp> |
| _Res |
| operator()(_Tp& __object, _ArgTypes... __args) const |
| { |
| return _M_call(__object, &__object, |
| std::forward<_ArgTypes>(__args)...); |
| } |
| |
| private: |
| _Functor __pmf; |
| }; |
| |
| /// Implementation of @c mem_fn for const volatile member function pointers. |
| template<typename _Res, typename _Class, typename... _ArgTypes> |
| class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile> |
| : public _Maybe_unary_or_binary_function<_Res, const volatile _Class*, |
| _ArgTypes...> |
| { |
| typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile; |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __object, const volatile _Class *, |
| _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| template<typename _Tp> |
| _Res |
| _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const |
| { return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| public: |
| typedef _Res result_type; |
| |
| explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } |
| |
| // Handle objects |
| _Res |
| operator()(const volatile _Class& __object, _ArgTypes... __args) const |
| { return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle pointers |
| _Res |
| operator()(const volatile _Class* __object, _ArgTypes... __args) const |
| { return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); } |
| |
| // Handle smart pointers, references and pointers to derived |
| template<typename _Tp> |
| _Res operator()(_Tp& __object, _ArgTypes... __args) const |
| { |
| return _M_call(__object, &__object, |
| std::forward<_ArgTypes>(__args)...); |
| } |
| |
| private: |
| _Functor __pmf; |
| }; |
| |
| |
| template<typename _Res, typename _Class> |
| class _Mem_fn<_Res _Class::*> |
| { |
| // This bit of genius is due to Peter Dimov, improved slightly by |
| // Douglas Gregor. |
| template<typename _Tp> |
| _Res& |
| _M_call(_Tp& __object, _Class *) const |
| { return __object.*__pm; } |
| |
| template<typename _Tp, typename _Up> |
| _Res& |
| _M_call(_Tp& __object, _Up * const *) const |
| { return (*__object).*__pm; } |
| |
| template<typename _Tp, typename _Up> |
| const _Res& |
| _M_call(_Tp& __object, const _Up * const *) const |
| { return (*__object).*__pm; } |
| |
| template<typename _Tp> |
| const _Res& |
| _M_call(_Tp& __object, const _Class *) const |
| { return __object.*__pm; } |
| |
| template<typename _Tp> |
| const _Res& |
| _M_call(_Tp& __ptr, const volatile void*) const |
| { return (*__ptr).*__pm; } |
| |
| template<typename _Tp> static _Tp& __get_ref(); |
| |
| template<typename _Tp> |
| static __sfinae_types::__one __check_const(_Tp&, _Class*); |
| template<typename _Tp, typename _Up> |
| static __sfinae_types::__one __check_const(_Tp&, _Up * const *); |
| template<typename _Tp, typename _Up> |
| static __sfinae_types::__two __check_const(_Tp&, const _Up * const *); |
| template<typename _Tp> |
| static __sfinae_types::__two __check_const(_Tp&, const _Class*); |
| template<typename _Tp> |
| static __sfinae_types::__two __check_const(_Tp&, const volatile void*); |
| |
| public: |
| template<typename _Tp> |
| struct _Result_type |
| : _Mem_fn_const_or_non<_Res, |
| (sizeof(__sfinae_types::__two) |
| == sizeof(__check_const<_Tp>(__get_ref<_Tp>(), (_Tp*)0)))> |
| { }; |
| |
| template<typename _Signature> |
| struct result; |
| |
| template<typename _CVMem, typename _Tp> |
| struct result<_CVMem(_Tp)> |
| : public _Result_type<_Tp> { }; |
| |
| template<typename _CVMem, typename _Tp> |
| struct result<_CVMem(_Tp&)> |
| : public _Result_type<_Tp> { }; |
| |
| explicit |
| _Mem_fn(_Res _Class::*__pm) : __pm(__pm) { } |
| |
| // Handle objects |
| _Res& |
| operator()(_Class& __object) const |
| { return __object.*__pm; } |
| |
| const _Res& |
| operator()(const _Class& __object) const |
| { return __object.*__pm; } |
| |
| // Handle pointers |
| _Res& |
| operator()(_Class* __object) const |
| { return __object->*__pm; } |
| |
| const _Res& |
| operator()(const _Class* __object) const |
| { return __object->*__pm; } |
| |
| // Handle smart pointers and derived |
| template<typename _Tp> |
| typename _Result_type<_Tp>::type |
| operator()(_Tp& __unknown) const |
| { return _M_call(__unknown, &__unknown); } |
| |
| private: |
| _Res _Class::*__pm; |
| }; |
| |
| /** |
| * @brief Returns a function object that forwards to the member |
| * pointer @a pm. |
| * @ingroup functors |
| */ |
| template<typename _Tp, typename _Class> |
| inline _Mem_fn<_Tp _Class::*> |
| mem_fn(_Tp _Class::* __pm) |
| { |
| return _Mem_fn<_Tp _Class::*>(__pm); |
| } |
| |
| /** |
| * @brief Determines if the given type _Tp is a function object |
| * should be treated as a subexpression when evaluating calls to |
| * function objects returned by bind(). [TR1 3.6.1] |
| * @ingroup binders |
| */ |
| template<typename _Tp> |
| struct is_bind_expression |
| : public false_type { }; |
| |
| /** |
| * @brief Determines if the given type _Tp is a placeholder in a |
| * bind() expression and, if so, which placeholder it is. [TR1 3.6.2] |
| * @ingroup binders |
| */ |
| template<typename _Tp> |
| struct is_placeholder |
| : public integral_constant<int, 0> |
| { }; |
| |
| /// The type of placeholder objects defined by libstdc++. |
| template<int _Num> struct _Placeholder { }; |
| |
| /** @namespace std::placeholders |
| * @brief ISO C++ 0x entities sub namespace for functional. |
| * @ingroup binders |
| * |
| * Define a large number of placeholders. There is no way to |
| * simplify this with variadic templates, because we're introducing |
| * unique names for each. |
| */ |
| namespace placeholders |
| { |
| namespace |
| { |
| _Placeholder<1> _1; |
| _Placeholder<2> _2; |
| _Placeholder<3> _3; |
| _Placeholder<4> _4; |
| _Placeholder<5> _5; |
| _Placeholder<6> _6; |
| _Placeholder<7> _7; |
| _Placeholder<8> _8; |
| _Placeholder<9> _9; |
| _Placeholder<10> _10; |
| _Placeholder<11> _11; |
| _Placeholder<12> _12; |
| _Placeholder<13> _13; |
| _Placeholder<14> _14; |
| _Placeholder<15> _15; |
| _Placeholder<16> _16; |
| _Placeholder<17> _17; |
| _Placeholder<18> _18; |
| _Placeholder<19> _19; |
| _Placeholder<20> _20; |
| _Placeholder<21> _21; |
| _Placeholder<22> _22; |
| _Placeholder<23> _23; |
| _Placeholder<24> _24; |
| _Placeholder<25> _25; |
| _Placeholder<26> _26; |
| _Placeholder<27> _27; |
| _Placeholder<28> _28; |
| _Placeholder<29> _29; |
| } |
| } |
| |
| /** |
| * Partial specialization of is_placeholder that provides the placeholder |
| * number for the placeholder objects defined by libstdc++. |
| * @ingroup binders |
| */ |
| template<int _Num> |
| struct is_placeholder<_Placeholder<_Num> > |
| : public integral_constant<int, _Num> |
| { }; |
| |
| /** |
| * Stores a tuple of indices. Used by bind() to extract the elements |
| * in a tuple. |
| */ |
| template<int... _Indexes> |
| struct _Index_tuple |
| { |
| typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next; |
| }; |
| |
| /// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>. |
| template<std::size_t _Num> |
| struct _Build_index_tuple |
| { |
| typedef typename _Build_index_tuple<_Num-1>::__type::__next __type; |
| }; |
| |
| template<> |
| struct _Build_index_tuple<0> |
| { |
| typedef _Index_tuple<> __type; |
| }; |
| |
| /** |
| * Used by _Safe_tuple_element to indicate that there is no tuple |
| * element at this position. |
| */ |
| struct _No_tuple_element; |
| |
| /** |
| * Implementation helper for _Safe_tuple_element. This primary |
| * template handles the case where it is safe to use @c |
| * tuple_element. |
| */ |
| template<int __i, typename _Tuple, bool _IsSafe> |
| struct _Safe_tuple_element_impl |
| : tuple_element<__i, _Tuple> { }; |
| |
| /** |
| * Implementation helper for _Safe_tuple_element. This partial |
| * specialization handles the case where it is not safe to use @c |
| * tuple_element. We just return @c _No_tuple_element. |
| */ |
| template<int __i, typename _Tuple> |
| struct _Safe_tuple_element_impl<__i, _Tuple, false> |
| { |
| typedef _No_tuple_element type; |
| }; |
| |
| /** |
| * Like tuple_element, but returns @c _No_tuple_element when |
| * tuple_element would return an error. |
| */ |
| template<int __i, typename _Tuple> |
| struct _Safe_tuple_element |
| : _Safe_tuple_element_impl<__i, _Tuple, |
| (__i >= 0 && __i < tuple_size<_Tuple>::value)> |
| { }; |
| |
| /** |
| * Maps an argument to bind() into an actual argument to the bound |
| * function object [TR1 3.6.3/5]. Only the first parameter should |
| * be specified: the rest are used to determine among the various |
| * implementations. Note that, although this class is a function |
| * object, it isn't entirely normal because it takes only two |
| * parameters regardless of the number of parameters passed to the |
| * bind expression. The first parameter is the bound argument and |
| * the second parameter is a tuple containing references to the |
| * rest of the arguments. |
| */ |
| template<typename _Arg, |
| bool _IsBindExp = is_bind_expression<_Arg>::value, |
| bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)> |
| class _Mu; |
| |
| /** |
| * If the argument is reference_wrapper<_Tp>, returns the |
| * underlying reference. [TR1 3.6.3/5 bullet 1] |
| */ |
| template<typename _Tp> |
| class _Mu<reference_wrapper<_Tp>, false, false> |
| { |
| public: |
| typedef _Tp& result_type; |
| |
| /* Note: This won't actually work for const volatile |
| * reference_wrappers, because reference_wrapper::get() is const |
| * but not volatile-qualified. This might be a defect in the TR. |
| */ |
| template<typename _CVRef, typename _Tuple> |
| result_type |
| operator()(_CVRef& __arg, _Tuple&&) const volatile |
| { return __arg.get(); } |
| }; |
| |
| /** |
| * If the argument is a bind expression, we invoke the underlying |
| * function object with the same cv-qualifiers as we are given and |
| * pass along all of our arguments (unwrapped). [TR1 3.6.3/5 bullet 2] |
| */ |
| template<typename _Arg> |
| class _Mu<_Arg, true, false> |
| { |
| public: |
| template<typename _Signature> class result; |
| |
| // Determine the result type when we pass the arguments along. This |
| // involves passing along the cv-qualifiers placed on _Mu and |
| // unwrapping the argument bundle. |
| template<typename _CVMu, typename _CVArg, typename... _Args> |
| class result<_CVMu(_CVArg, tuple<_Args...>)> |
| : public result_of<_CVArg(_Args...)> { }; |
| |
| template<typename _CVArg, typename... _Args> |
| typename result_of<_CVArg(_Args...)>::type |
| operator()(_CVArg& __arg, |
| tuple<_Args...>&& __tuple) const volatile |
| { |
| // Construct an index tuple and forward to __call |
| typedef typename _Build_index_tuple<sizeof...(_Args)>::__type |
| _Indexes; |
| return this->__call(__arg, std::move(__tuple), _Indexes()); |
| } |
| |
| private: |
| // Invokes the underlying function object __arg by unpacking all |
| // of the arguments in the tuple. |
| template<typename _CVArg, typename... _Args, int... _Indexes> |
| typename result_of<_CVArg(_Args...)>::type |
| __call(_CVArg& __arg, tuple<_Args...>&& __tuple, |
| const _Index_tuple<_Indexes...>&) const volatile |
| { |
| return __arg(std::forward<_Args>(get<_Indexes>(__tuple))...); |
| } |
| }; |
| |
| /** |
| * If the argument is a placeholder for the Nth argument, returns |
| * a reference to the Nth argument to the bind function object. |
| * [TR1 3.6.3/5 bullet 3] |
| */ |
| template<typename _Arg> |
| class _Mu<_Arg, false, true> |
| { |
| public: |
| template<typename _Signature> class result; |
| |
| template<typename _CVMu, typename _CVArg, typename _Tuple> |
| class result<_CVMu(_CVArg, _Tuple)> |
| { |
| // Add a reference, if it hasn't already been done for us. |
| // This allows us to be a little bit sloppy in constructing |
| // the tuple that we pass to result_of<...>. |
| typedef typename _Safe_tuple_element<(is_placeholder<_Arg>::value |
| - 1), _Tuple>::type |
| __base_type; |
| |
| public: |
| typedef typename add_rvalue_reference<__base_type>::type type; |
| }; |
| |
| template<typename _Tuple> |
| typename result<_Mu(_Arg, _Tuple)>::type |
| operator()(const volatile _Arg&, _Tuple&& __tuple) const volatile |
| { |
| return std::forward<typename result<_Mu(_Arg, _Tuple)>::type>( |
| ::std::get<(is_placeholder<_Arg>::value - 1)>(__tuple)); |
| } |
| }; |
| |
| /** |
| * If the argument is just a value, returns a reference to that |
| * value. The cv-qualifiers on the reference are the same as the |
| * cv-qualifiers on the _Mu object. [TR1 3.6.3/5 bullet 4] |
| */ |
| template<typename _Arg> |
| class _Mu<_Arg, false, false> |
| { |
| public: |
| template<typename _Signature> struct result; |
| |
| template<typename _CVMu, typename _CVArg, typename _Tuple> |
| struct result<_CVMu(_CVArg, _Tuple)> |
| { |
| typedef typename add_lvalue_reference<_CVArg>::type type; |
| }; |
| |
| // Pick up the cv-qualifiers of the argument |
| template<typename _CVArg, typename _Tuple> |
| _CVArg&& |
| operator()(_CVArg&& __arg, _Tuple&&) const volatile |
| { return std::forward<_CVArg>(__arg); } |
| }; |
| |
| /** |
| * Maps member pointers into instances of _Mem_fn but leaves all |
| * other function objects untouched. Used by tr1::bind(). The |
| * primary template handles the non--member-pointer case. |
| */ |
| template<typename _Tp> |
| struct _Maybe_wrap_member_pointer |
| { |
| typedef _Tp type; |
| |
| static const _Tp& |
| __do_wrap(const _Tp& __x) |
| { return __x; } |
| }; |
| |
| /** |
| * Maps member pointers into instances of _Mem_fn but leaves all |
| * other function objects untouched. Used by tr1::bind(). This |
| * partial specialization handles the member pointer case. |
| */ |
| template<typename _Tp, typename _Class> |
| struct _Maybe_wrap_member_pointer<_Tp _Class::*> |
| { |
| typedef _Mem_fn<_Tp _Class::*> type; |
| |
| static type |
| __do_wrap(_Tp _Class::* __pm) |
| { return type(__pm); } |
| }; |
| |
| // Specialization needed to prevent "forming reference to void" errors when |
| // bind<void>() is called, because argument deduction instantiates |
| // _Maybe_wrap_member_pointer<void> outside the immediate context where |
| // SFINAE applies. |
| template<> |
| struct _Maybe_wrap_member_pointer<void> |
| { |
| typedef void type; |
| }; |
| |
| /// Type of the function object returned from bind(). |
| template<typename _Signature> |
| struct _Bind; |
| |
| template<typename _Functor, typename... _Bound_args> |
| class _Bind<_Functor(_Bound_args...)> |
| : public _Weak_result_type<_Functor> |
| { |
| typedef _Bind __self_type; |
| typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type |
| _Bound_indexes; |
| |
| _Functor _M_f; |
| tuple<_Bound_args...> _M_bound_args; |
| |
| // Call unqualified |
| template<typename _Result, typename... _Args, int... _Indexes> |
| _Result |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as const |
| template<typename _Result, typename... _Args, int... _Indexes> |
| _Result |
| __call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| #if 0 |
| // Call as volatile |
| template<typename _Result, typename... _Args, int... _Indexes> |
| _Result |
| __call_v(tuple<_Args...>&& __args, |
| _Index_tuple<_Indexes...>) volatile |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as const volatile |
| template<typename _Result, typename... _Args, int... _Indexes> |
| _Result |
| __call_c_v(tuple<_Args...>&& __args, |
| _Index_tuple<_Indexes...>) const volatile |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| #endif |
| |
| public: |
| explicit _Bind(_Functor __f, _Bound_args... __bound_args) |
| : _M_f(std::forward<_Functor>(__f)), |
| _M_bound_args(std::forward<_Bound_args>(__bound_args)...) |
| { } |
| |
| // Call unqualified |
| template<typename... _Args, typename _Result |
| = decltype( std::declval<_Functor>()( |
| _Mu<_Bound_args>()( std::declval<_Bound_args&>(), |
| std::declval<tuple<_Args...>&&>() )... ) )> |
| _Result |
| operator()(_Args&&... __args) |
| { |
| return this->__call<_Result>(tuple<_Args...> |
| (std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| |
| // Call as const |
| template<typename... _Args, typename _Result |
| = decltype( std::declval<const _Functor>()( |
| _Mu<_Bound_args>()( std::declval<const _Bound_args&>(), |
| std::declval<tuple<_Args...>&&>() )... ) )> |
| _Result |
| operator()(_Args&&... __args) const |
| { |
| return this->__call_c<_Result>(tuple<_Args...> |
| (std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| |
| #if 0 |
| // Call as volatile |
| template<typename... _Args, typename _Result |
| = decltype( std::declval<volatile _Functor>()( |
| _Mu<_Bound_args>()( std::declval<volatile _Bound_args&>(), |
| std::declval<tuple<_Args...>&&>() )... ) )> |
| _Result |
| operator()(_Args&&... __args) volatile |
| { |
| return this->__call_v<_Result>(tuple<_Args...> |
| (std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| |
| // Call as const volatile |
| template<typename... _Args, typename _Result |
| = decltype( std::declval<const volatile _Functor>()( |
| _Mu<_Bound_args>()( std::declval<const volatile _Bound_args&>(), |
| std::declval<tuple<_Args...>&&>() )... ) )> |
| _Result |
| operator()(_Args&&... __args) const volatile |
| { |
| return this->__call_c_v<_Result>(tuple<_Args...> |
| (std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| #endif |
| }; |
| |
| /// Type of the function object returned from bind<R>(). |
| template<typename _Result, typename _Signature> |
| struct _Bind_result; |
| |
| template<typename _Result, typename _Functor, typename... _Bound_args> |
| class _Bind_result<_Result, _Functor(_Bound_args...)> |
| { |
| typedef _Bind_result __self_type; |
| typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type |
| _Bound_indexes; |
| |
| _Functor _M_f; |
| tuple<_Bound_args...> _M_bound_args; |
| |
| // sfinae types |
| template<typename _Res> |
| struct __enable_if_void : enable_if<is_void<_Res>::value, int> { }; |
| template<typename _Res> |
| struct __disable_if_void : enable_if<!is_void<_Res>::value, int> { }; |
| |
| // Call unqualified |
| template<typename _Res, typename... _Args, int... _Indexes> |
| _Result |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __disable_if_void<_Res>::type = 0) |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call unqualified, return void |
| template<typename _Res, typename... _Args, int... _Indexes> |
| void |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __enable_if_void<_Res>::type = 0) |
| { |
| _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as const |
| template<typename _Res, typename... _Args, int... _Indexes> |
| _Result |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __disable_if_void<_Res>::type = 0) const |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as const, return void |
| template<typename _Res, typename... _Args, int... _Indexes> |
| void |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __enable_if_void<_Res>::type = 0) const |
| { |
| _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as volatile |
| template<typename _Res, typename... _Args, int... _Indexes> |
| _Result |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __disable_if_void<_Res>::type = 0) volatile |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as volatile, return void |
| template<typename _Res, typename... _Args, int... _Indexes> |
| void |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __enable_if_void<_Res>::type = 0) volatile |
| { |
| _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as const volatile |
| template<typename _Res, typename... _Args, int... _Indexes> |
| _Result |
| __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, |
| typename __disable_if_void<_Res>::type = 0) const volatile |
| { |
| return _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| // Call as const volatile, return void |
| template<typename _Res, typename... _Args, int... _Indexes> |
| void |
| __call(tuple<_Args...>&& __args, |
| _Index_tuple<_Indexes...>, |
| typename __enable_if_void<_Res>::type = 0) const volatile |
| { |
| _M_f(_Mu<_Bound_args>() |
| (get<_Indexes>(_M_bound_args), std::move(__args))...); |
| } |
| |
| public: |
| typedef _Result result_type; |
| |
| explicit |
| _Bind_result(_Functor __f, _Bound_args... __bound_args) |
| : _M_f(std::forward<_Functor>(__f)), |
| _M_bound_args(std::forward<_Bound_args>(__bound_args)...) |
| { } |
| |
| // Call unqualified |
| template<typename... _Args> |
| result_type |
| operator()(_Args&&... __args) |
| { |
| return this->__call<_Result>( |
| tuple<_Args...>(std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| |
| // Call as const |
| template<typename... _Args> |
| result_type |
| operator()(_Args&&... __args) const |
| { |
| return this->__call<_Result>( |
| tuple<_Args...>(std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| |
| // Call as volatile |
| template<typename... _Args> |
| result_type |
| operator()(_Args&&... __args) volatile |
| { |
| return this->__call<_Result>( |
| tuple<_Args...>(std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| |
| // Call as const volatile |
| template<typename... _Args> |
| result_type |
| operator()(_Args&&... __args) const volatile |
| { |
| return this->__call<_Result>( |
| tuple<_Args...>(std::forward<_Args>(__args)...), |
| _Bound_indexes()); |
| } |
| }; |
| |
| /** |
| * @brief Class template _Bind is always a bind expression. |
| * @ingroup binders |
| */ |
| template<typename _Signature> |
| struct is_bind_expression<_Bind<_Signature> > |
| : public true_type { }; |
| |
| /** |
| * @brief Class template _Bind is always a bind expression. |
| * @ingroup binders |
| */ |
| template<typename _Result, typename _Signature> |
| struct is_bind_expression<_Bind_result<_Result, _Signature> > |
| : public true_type { }; |
| |
| /** |
| * @brief Function template for std::bind. |
| * @ingroup binders |
| */ |
| template<typename _Functor, typename... _ArgTypes> |
| inline |
| _Bind<typename _Maybe_wrap_member_pointer<_Functor>::type(_ArgTypes...)> |
| bind(_Functor __f, _ArgTypes... __args) |
| { |
| typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type; |
| typedef typename __maybe_type::type __functor_type; |
| typedef _Bind<__functor_type(_ArgTypes...)> __result_type; |
| return __result_type(__maybe_type::__do_wrap(__f), |
| std::forward<_ArgTypes>(__args)...); |
| } |
| |
| /** |
| * @brief Function template for std::bind. |
| * @ingroup binders |
| */ |
| template<typename _Result, typename _Functor, typename... _ArgTypes> |
| inline |
| _Bind_result<_Result, |
| typename _Maybe_wrap_member_pointer<_Functor>::type |
| (_ArgTypes...)> |
| bind(_Functor __f, _ArgTypes... __args) |
| { |
| typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type; |
| typedef typename __maybe_type::type __functor_type; |
| typedef _Bind_result<_Result, __functor_type(_ArgTypes...)> |
| __result_type; |
| return __result_type(__maybe_type::__do_wrap(__f), |
| std::forward<_ArgTypes>(__args)...); |
| } |
| |
| /** |
| * @brief Exception class thrown when class template function's |
| * operator() is called with an empty target. |
| * @ingroup exceptions |
| */ |
| class bad_function_call : public std::exception { }; |
| |
| /** |
| * The integral constant expression 0 can be converted into a |
| * pointer to this type. It is used by the function template to |
| * accept NULL pointers. |
| */ |
| struct _M_clear_type; |
| |
| /** |
| * Trait identifying "location-invariant" types, meaning that the |
| * address of the object (or any of its members) will not escape. |
| * Also implies a trivial copy constructor and assignment operator. |
| */ |
| template<typename _Tp> |
| struct __is_location_invariant |
| : integral_constant<bool, (is_pointer<_Tp>::value |
| || is_member_pointer<_Tp>::value)> |
| { }; |
| |
| class _Undefined_class; |
| |
| union _Nocopy_types |
| { |
| void* _M_object; |
| const void* _M_const_object; |
| void (*_M_function_pointer)(); |
| void (_Undefined_class::*_M_member_pointer)(); |
| }; |
| |
| union _Any_data |
| { |
| void* _M_access() { return &_M_pod_data[0]; } |
| const void* _M_access() const { return &_M_pod_data[0]; } |
| |
| template<typename _Tp> |
| _Tp& |
| _M_access() |
| { return *static_cast<_Tp*>(_M_access()); } |
| |
| template<typename _Tp> |
| const _Tp& |
| _M_access() const |
| { return *static_cast<const _Tp*>(_M_access()); } |
| |
| _Nocopy_types _M_unused; |
| char _M_pod_data[sizeof(_Nocopy_types)]; |
| }; |
| |
| enum _Manager_operation |
| { |
| __get_type_info, |
| __get_functor_ptr, |
| __clone_functor, |
| __destroy_functor |
| }; |
| |
| // Simple type wrapper that helps avoid annoying const problems |
| // when casting between void pointers and pointers-to-pointers. |
| template<typename _Tp> |
| struct _Simple_type_wrapper |
| { |
| _Simple_type_wrapper(_Tp __value) : __value(__value) { } |
| |
| _Tp __value; |
| }; |
| |
| template<typename _Tp> |
| struct __is_location_invariant<_Simple_type_wrapper<_Tp> > |
| : __is_location_invariant<_Tp> |
| { }; |
| |
| // Converts a reference to a function object into a callable |
| // function object. |
| template<typename _Functor> |
| inline _Functor& |
| __callable_functor(_Functor& __f) |
| { return __f; } |
| |
| template<typename _Member, typename _Class> |
| inline _Mem_fn<_Member _Class::*> |
| __callable_functor(_Member _Class::* &__p) |
| { return mem_fn(__p); } |
| |
| template<typename _Member, typename _Class> |
| inline _Mem_fn<_Member _Class::*> |
| __callable_functor(_Member _Class::* const &__p) |
| { return mem_fn(__p); } |
| |
| template<typename _Signature> |
| class function; |
| |
| /// Base class of all polymorphic function object wrappers. |
| class _Function_base |
| { |
| public: |
| static const std::size_t _M_max_size = sizeof(_Nocopy_types); |
| static const std::size_t _M_max_align = __alignof__(_Nocopy_types); |
| |
| template<typename _Functor> |
| class _Base_manager |
| { |
| protected: |
| static const bool __stored_locally = |
| (__is_location_invariant<_Functor>::value |
| && sizeof(_Functor) <= _M_max_size |
| && __alignof__(_Functor) <= _M_max_align |
| && (_M_max_align % __alignof__(_Functor) == 0)); |
| |
| typedef integral_constant<bool, __stored_locally> _Local_storage; |
| |
| // Retrieve a pointer to the function object |
| static _Functor* |
| _M_get_pointer(const _Any_data& __source) |
| { |
| const _Functor* __ptr = |
| __stored_locally? &__source._M_access<_Functor>() |
| /* have stored a pointer */ : __source._M_access<_Functor*>(); |
| return const_cast<_Functor*>(__ptr); |
| } |
| |
| // Clone a location-invariant function object that fits within |
| // an _Any_data structure. |
| static void |
| _M_clone(_Any_data& __dest, const _Any_data& __source, true_type) |
| { |
| new (__dest._M_access()) _Functor(__source._M_access<_Functor>()); |
| } |
| |
| // Clone a function object that is not location-invariant or |
| // that cannot fit into an _Any_data structure. |
| static void |
| _M_clone(_Any_data& __dest, const _Any_data& __source, false_type) |
| { |
| __dest._M_access<_Functor*>() = |
| new _Functor(*__source._M_access<_Functor*>()); |
| } |
| |
| // Destroying a location-invariant object may still require |
| // destruction. |
| static void |
| _M_destroy(_Any_data& __victim, true_type) |
| { |
| __victim._M_access<_Functor>().~_Functor(); |
| } |
| |
| // Destroying an object located on the heap. |
| static void |
| _M_destroy(_Any_data& __victim, false_type) |
| { |
| delete __victim._M_access<_Functor*>(); |
| } |
| |
| public: |
| static bool |
| _M_manager(_Any_data& __dest, const _Any_data& __source, |
| _Manager_operation __op) |
| { |
| switch (__op) |
| { |
| #ifdef __GXX_RTTI |
| case __get_type_info: |
| __dest._M_access<const type_info*>() = &typeid(_Functor); |
| break; |
| #endif |
| case __get_functor_ptr: |
| __dest._M_access<_Functor*>() = _M_get_pointer(__source); |
| break; |
| |
| case __clone_functor: |
| _M_clone(__dest, __source, _Local_storage()); |
| break; |
| |
| case __destroy_functor: |
| _M_destroy(__dest, _Local_storage()); |
| break; |
| } |
| return false; |
| } |
| |
| static void |
| _M_init_functor(_Any_data& __functor, _Functor&& __f) |
| { _M_init_functor(__functor, std::move(__f), _Local_storage()); } |
| |
| template<typename _Signature> |
| static bool |
| _M_not_empty_function(const function<_Signature>& __f) |
| { return static_cast<bool>(__f); } |
| |
| template<typename _Tp> |
| static bool |
| _M_not_empty_function(const _Tp*& __fp) |
| { return __fp; } |
| |
| template<typename _Class, typename _Tp> |
| static bool |
| _M_not_empty_function(_Tp _Class::* const& __mp) |
| { return __mp; } |
| |
| template<typename _Tp> |
| static bool |
| _M_not_empty_function(const _Tp&) |
| { return true; } |
| |
| private: |
| static void |
| _M_init_functor(_Any_data& __functor, _Functor&& __f, true_type) |
| { new (__functor._M_access()) _Functor(std::move(__f)); } |
| |
| static void |
| _M_init_functor(_Any_data& __functor, _Functor&& __f, false_type) |
| { __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); } |
| }; |
| |
| template<typename _Functor> |
| class _Ref_manager : public _Base_manager<_Functor*> |
| { |
| typedef _Function_base::_Base_manager<_Functor*> _Base; |
| |
| public: |
| static bool |
| _M_manager(_Any_data& __dest, const _Any_data& __source, |
| _Manager_operation __op) |
| { |
| switch (__op) |
| { |
| #ifdef __GXX_RTTI |
| case __get_type_info: |
| __dest._M_access<const type_info*>() = &typeid(_Functor); |
| break; |
| #endif |
| case __get_functor_ptr: |
| __dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source); |
| return is_const<_Functor>::value; |
| break; |
| |
| default: |
| _Base::_M_manager(__dest, __source, __op); |
| } |
| return false; |
| } |
| |
| static void |
| _M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f) |
| { |
| // TBD: Use address_of function instead. |
| _Base::_M_init_functor(__functor, &__f.get()); |
| } |
| }; |
| |
| _Function_base() : _M_manager(0) { } |
| |
| ~_Function_base() |
| { |
| if (_M_manager) |
| _M_manager(_M_functor, _M_functor, __destroy_functor); |
| } |
| |
| |
| bool _M_empty() const { return !_M_manager; } |
| |
| typedef bool (*_Manager_type)(_Any_data&, const _Any_data&, |
| _Manager_operation); |
| |
| _Any_data _M_functor; |
| _Manager_type _M_manager; |
| }; |
| |
| template<typename _Signature, typename _Functor> |
| class _Function_handler; |
| |
| template<typename _Res, typename _Functor, typename... _ArgTypes> |
| class _Function_handler<_Res(_ArgTypes...), _Functor> |
| : public _Function_base::_Base_manager<_Functor> |
| { |
| typedef _Function_base::_Base_manager<_Functor> _Base; |
| |
| public: |
| static _Res |
| _M_invoke(const _Any_data& __functor, _ArgTypes... __args) |
| { |
| return (*_Base::_M_get_pointer(__functor))( |
| std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| template<typename _Functor, typename... _ArgTypes> |
| class _Function_handler<void(_ArgTypes...), _Functor> |
| : public _Function_base::_Base_manager<_Functor> |
| { |
| typedef _Function_base::_Base_manager<_Functor> _Base; |
| |
| public: |
| static void |
| _M_invoke(const _Any_data& __functor, _ArgTypes... __args) |
| { |
| (*_Base::_M_get_pointer(__functor))( |
| std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| template<typename _Res, typename _Functor, typename... _ArgTypes> |
| class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> > |
| : public _Function_base::_Ref_manager<_Functor> |
| { |
| typedef _Function_base::_Ref_manager<_Functor> _Base; |
| |
| public: |
| static _Res |
| _M_invoke(const _Any_data& __functor, _ArgTypes... __args) |
| { |
| return __callable_functor(**_Base::_M_get_pointer(__functor))( |
| std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| template<typename _Functor, typename... _ArgTypes> |
| class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> > |
| : public _Function_base::_Ref_manager<_Functor> |
| { |
| typedef _Function_base::_Ref_manager<_Functor> _Base; |
| |
| public: |
| static void |
| _M_invoke(const _Any_data& __functor, _ArgTypes... __args) |
| { |
| __callable_functor(**_Base::_M_get_pointer(__functor))( |
| std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| template<typename _Class, typename _Member, typename _Res, |
| typename... _ArgTypes> |
| class _Function_handler<_Res(_ArgTypes...), _Member _Class::*> |
| : public _Function_handler<void(_ArgTypes...), _Member _Class::*> |
| { |
| typedef _Function_handler<void(_ArgTypes...), _Member _Class::*> |
| _Base; |
| |
| public: |
| static _Res |
| _M_invoke(const _Any_data& __functor, _ArgTypes... __args) |
| { |
| return mem_fn(_Base::_M_get_pointer(__functor)->__value)( |
| std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| template<typename _Class, typename _Member, typename... _ArgTypes> |
| class _Function_handler<void(_ArgTypes...), _Member _Class::*> |
| : public _Function_base::_Base_manager< |
| _Simple_type_wrapper< _Member _Class::* > > |
| { |
| typedef _Member _Class::* _Functor; |
| typedef _Simple_type_wrapper<_Functor> _Wrapper; |
| typedef _Function_base::_Base_manager<_Wrapper> _Base; |
| |
| public: |
| static bool |
| _M_manager(_Any_data& __dest, const _Any_data& __source, |
| _Manager_operation __op) |
| { |
| switch (__op) |
| { |
| #ifdef __GXX_RTTI |
| case __get_type_info: |
| __dest._M_access<const type_info*>() = &typeid(_Functor); |
| break; |
| #endif |
| case __get_functor_ptr: |
| __dest._M_access<_Functor*>() = |
| &_Base::_M_get_pointer(__source)->__value; |
| break; |
| |
| default: |
| _Base::_M_manager(__dest, __source, __op); |
| } |
| return false; |
| } |
| |
| static void |
| _M_invoke(const _Any_data& __functor, _ArgTypes... __args) |
| { |
| mem_fn(_Base::_M_get_pointer(__functor)->__value)( |
| std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| /** |
| * @brief Primary class template for std::function. |
| * @ingroup functors |
| * |
| * Polymorphic function wrapper. |
| */ |
| template<typename _Res, typename... _ArgTypes> |
| class function<_Res(_ArgTypes...)> |
| : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>, |
| private _Function_base |
| { |
| typedef _Res _Signature_type(_ArgTypes...); |
| |
| struct _Useless { }; |
| |
| public: |
| typedef _Res result_type; |
| |
| // [3.7.2.1] construct/copy/destroy |
| |
| /** |
| * @brief Default construct creates an empty function call wrapper. |
| * @post @c !(bool)*this |
| */ |
| explicit |
| function() : _Function_base() { } |
| |
| /** |
| * @brief Default construct creates an empty function call wrapper. |
| * @post @c !(bool)*this |
| */ |
| function(_M_clear_type*) : _Function_base() { } |
| |
| /** |
| * @brief %Function copy constructor. |
| * @param x A %function object with identical call signature. |
| * @post @c (bool)*this == (bool)x |
| * |
| * The newly-created %function contains a copy of the target of @a |
| * x (if it has one). |
| */ |
| function(const function& __x); |
| |
| /** |
| * @brief %Function move constructor. |
| * @param x A %function object rvalue with identical call signature. |
| * |
| * The newly-created %function contains the target of @a x |
| * (if it has one). |
| */ |
| function(function&& __x) : _Function_base() |
| { |
| __x.swap(*this); |
| } |
| |
| // TODO: needs allocator_arg_t |
| |
| /** |
| * @brief Builds a %function that targets a copy of the incoming |
| * function object. |
| * @param f A %function object that is callable with parameters of |
| * type @c T1, @c T2, ..., @c TN and returns a value convertible |
| * to @c Res. |
| * |
| * The newly-created %function object will target a copy of @a |
| * f. If @a f is @c reference_wrapper<F>, then this function |
| * object will contain a reference to the function object @c |
| * f.get(). If @a f is a NULL function pointer or NULL |
| * pointer-to-member, the newly-created object will be empty. |
| * |
| * If @a f is a non-NULL function pointer or an object of type @c |
| * reference_wrapper<F>, this function will not throw. |
| */ |
| template<typename _Functor> |
| function(_Functor __f, |
| typename enable_if< |
| !is_integral<_Functor>::value, _Useless>::type |
| = _Useless()); |
| |
| /** |
| * @brief %Function assignment operator. |
| * @param x A %function with identical call signature. |
| * @post @c (bool)*this == (bool)x |
| * @returns @c *this |
| * |
| * The target of @a x is copied to @c *this. If @a x has no |
| * target, then @c *this will be empty. |
| * |
| * If @a x targets a function pointer or a reference to a function |
| * object, then this operation will not throw an %exception. |
| */ |
| function& |
| operator=(const function& __x) |
| { |
| function(__x).swap(*this); |
| return *this; |
| } |
| |
| /** |
| * @brief %Function move-assignment operator. |
| * @param x A %function rvalue with identical call signature. |
| * @returns @c *this |
| * |
| * The target of @a x is moved to @c *this. If @a x has no |
| * target, then @c *this will be empty. |
| * |
| * If @a x targets a function pointer or a reference to a function |
| * object, then this operation will not throw an %exception. |
| */ |
| function& |
| operator=(function&& __x) |
| { |
| function(std::move(__x)).swap(*this); |
| return *this; |
| } |
| |
| /** |
| * @brief %Function assignment to zero. |
| * @post @c !(bool)*this |
| * @returns @c *this |
| * |
| * The target of @c *this is deallocated, leaving it empty. |
| */ |
| function& |
| operator=(_M_clear_type*) |
| { |
| if (_M_manager) |
| { |
| _M_manager(_M_functor, _M_functor, __destroy_functor); |
| _M_manager = 0; |
| _M_invoker = 0; |
| } |
| return *this; |
| } |
| |
| /** |
| * @brief %Function assignment to a new target. |
| * @param f A %function object that is callable with parameters of |
| * type @c T1, @c T2, ..., @c TN and returns a value convertible |
| * to @c Res. |
| * @return @c *this |
| * |
| * This %function object wrapper will target a copy of @a |
| * f. If @a f is @c reference_wrapper<F>, then this function |
| * object will contain a reference to the function object @c |
| * f.get(). If @a f is a NULL function pointer or NULL |
| * pointer-to-member, @c this object will be empty. |
| * |
| * If @a f is a non-NULL function pointer or an object of type @c |
| * reference_wrapper<F>, this function will not throw. |
| */ |
| template<typename _Functor> |
| typename enable_if<!is_integral<_Functor>::value, function&>::type |
| operator=(_Functor&& __f) |
| { |
| function(std::forward<_Functor>(__f)).swap(*this); |
| return *this; |
| } |
| |
| /// @overload |
| template<typename _Functor> |
| typename enable_if<!is_integral<_Functor>::value, function&>::type |
| operator=(reference_wrapper<_Functor> __f) |
| { |
| function(__f).swap(*this); |
| return *this; |
| } |
| |
| // [3.7.2.2] function modifiers |
| |
| /** |
| * @brief Swap the targets of two %function objects. |
| * @param f A %function with identical call signature. |
| * |
| * Swap the targets of @c this function object and @a f. This |
| * function will not throw an %exception. |
| */ |
| void swap(function& __x) |
| { |
| /* We cannot perform direct assignments of the _M_functor |
| parts as they are of type _Any_data and have a different |
| dynamic type. Doing so would violate type-based aliasing |
| rules and lead to spurious miscompilations. |
| Instead perform a bytewise exchange of the memory of |
| both POD objects. |
| ??? A wordwise exchange honoring alignment of _M_functor |
| would be more efficient. See PR42845. */ |
| for (unsigned i = 0; i < sizeof (_M_functor._M_pod_data); ++i) |
| std::swap (_M_functor._M_pod_data[i], __x._M_functor._M_pod_data[i]); |
| _Manager_type __old_manager = _M_manager; |
| _M_manager = __x._M_manager; |
| __x._M_manager = __old_manager; |
| _Invoker_type __old_invoker = _M_invoker; |
| _M_invoker = __x._M_invoker; |
| __x._M_invoker = __old_invoker; |
| } |
| |
| // TODO: needs allocator_arg_t |
| /* |
| template<typename _Functor, typename _Alloc> |
| void |
| assign(_Functor&& __f, const _Alloc& __a) |
| { |
| function(allocator_arg, __a, |
| std::forward<_Functor>(__f)).swap(*this); |
| } |
| */ |
| |
| // [3.7.2.3] function capacity |
| |
| /** |
| * @brief Determine if the %function wrapper has a target. |
| * |
| * @return @c true when this %function object contains a target, |
| * or @c false when it is empty. |
| * |
| * This function will not throw an %exception. |
| */ |
| explicit operator bool() const |
| { return !_M_empty(); } |
| |
| // [3.7.2.4] function invocation |
| |
| /** |
| * @brief Invokes the function targeted by @c *this. |
| * @returns the result of the target. |
| * @throws bad_function_call when @c !(bool)*this |
| * |
| * The function call operator invokes the target function object |
| * stored by @c this. |
| */ |
| _Res operator()(_ArgTypes... __args) const; |
| |
| #ifdef __GXX_RTTI |
| // [3.7.2.5] function target access |
| /** |
| * @brief Determine the type of the target of this function object |
| * wrapper. |
| * |
| * @returns the type identifier of the target function object, or |
| * @c typeid(void) if @c !(bool)*this. |
| * |
| * This function will not throw an %exception. |
| */ |
| const type_info& target_type() const; |
| |
| /** |
| * @brief Access the stored target function object. |
| * |
| * @return Returns a pointer to the stored target function object, |
| * if @c typeid(Functor).equals(target_type()); otherwise, a NULL |
| * pointer. |
| * |
| * This function will not throw an %exception. |
| */ |
| template<typename _Functor> _Functor* target(); |
| |
| /// @overload |
| template<typename _Functor> const _Functor* target() const; |
| #endif |
| |
| // deleted overloads |
| template<typename _Res2, typename... _ArgTypes2> |
| void operator==(const function<_Res2(_ArgTypes2...)>&) const = delete; |
| template<typename _Res2, typename... _ArgTypes2> |
| void operator!=(const function<_Res2(_ArgTypes2...)>&) const = delete; |
| |
| private: |
| typedef _Res (*_Invoker_type)(const _Any_data&, _ArgTypes...); |
| _Invoker_type _M_invoker; |
| }; |
| |
| // Out-of-line member definitions. |
| template<typename _Res, typename... _ArgTypes> |
| function<_Res(_ArgTypes...)>:: |
| function(const function& __x) |
| : _Function_base() |
| { |
| if (static_cast<bool>(__x)) |
| { |
| _M_invoker = __x._M_invoker; |
| _M_manager = __x._M_manager; |
| __x._M_manager(_M_functor, __x._M_functor, __clone_functor); |
| } |
| } |
| |
| template<typename _Res, typename... _ArgTypes> |
| template<typename _Functor> |
| function<_Res(_ArgTypes...)>:: |
| function(_Functor __f, |
| typename enable_if< |
| !is_integral<_Functor>::value, _Useless>::type) |
| : _Function_base() |
| { |
| typedef _Function_handler<_Signature_type, _Functor> _My_handler; |
| |
| if (_My_handler::_M_not_empty_function(__f)) |
| { |
| _M_invoker = &_My_handler::_M_invoke; |
| _M_manager = &_My_handler::_M_manager; |
| _My_handler::_M_init_functor(_M_functor, std::move(__f)); |
| } |
| } |
| |
| template<typename _Res, typename... _ArgTypes> |
| _Res |
| function<_Res(_ArgTypes...)>:: |
| operator()(_ArgTypes... __args) const |
| { |
| if (_M_empty()) |
| __throw_bad_function_call(); |
| return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...); |
| } |
| |
| #ifdef __GXX_RTTI |
| template<typename _Res, typename... _ArgTypes> |
| const type_info& |
| function<_Res(_ArgTypes...)>:: |
| target_type() const |
| { |
| if (_M_manager) |
| { |
| _Any_data __typeinfo_result; |
| _M_manager(__typeinfo_result, _M_functor, __get_type_info); |
| return *__typeinfo_result._M_access<const type_info*>(); |
| } |
| else |
| return typeid(void); |
| } |
| |
| template<typename _Res, typename... _ArgTypes> |
| template<typename _Functor> |
| _Functor* |
| function<_Res(_ArgTypes...)>:: |
| target() |
| { |
| if (typeid(_Functor) == target_type() && _M_manager) |
| { |
| _Any_data __ptr; |
| if (_M_manager(__ptr, _M_functor, __get_functor_ptr) |
| && !is_const<_Functor>::value) |
| return 0; |
| else |
| return __ptr._M_access<_Functor*>(); |
| } |
| else |
| return 0; |
| } |
| |
| template<typename _Res, typename... _ArgTypes> |
| template<typename _Functor> |
| const _Functor* |
| function<_Res(_ArgTypes...)>:: |
| target() const |
| { |
| if (typeid(_Functor) == target_type() && _M_manager) |
| { |
| _Any_data __ptr; |
| _M_manager(__ptr, _M_functor, __get_functor_ptr); |
| return __ptr._M_access<const _Functor*>(); |
| } |
| else |
| return 0; |
| } |
| #endif |
| |
| // [20.7.15.2.6] null pointer comparisons |
| |
| /** |
| * @brief Compares a polymorphic function object wrapper against 0 |
| * (the NULL pointer). |
| * @returns @c true if the wrapper has no target, @c false otherwise |
| * |
| * This function will not throw an %exception. |
| */ |
| template<typename _Res, typename... _Args> |
| inline bool |
| operator==(const function<_Res(_Args...)>& __f, _M_clear_type*) |
| { return !static_cast<bool>(__f); } |
| |
| /// @overload |
| template<typename _Res, typename... _Args> |
| inline bool |
| operator==(_M_clear_type*, const function<_Res(_Args...)>& __f) |
| { return !static_cast<bool>(__f); } |
| |
| /** |
| * @brief Compares a polymorphic function object wrapper against 0 |
| * (the NULL pointer). |
| * @returns @c false if the wrapper has no target, @c true otherwise |
| * |
| * This function will not throw an %exception. |
| */ |
| template<typename _Res, typename... _Args> |
| inline bool |
| operator!=(const function<_Res(_Args...)>& __f, _M_clear_type*) |
| { return static_cast<bool>(__f); } |
| |
| /// @overload |
| template<typename _Res, typename... _Args> |
| inline bool |
| operator!=(_M_clear_type*, const function<_Res(_Args...)>& __f) |
| { return static_cast<bool>(__f); } |
| |
| // [20.7.15.2.7] specialized algorithms |
| |
| /** |
| * @brief Swap the targets of two polymorphic function object wrappers. |
| * |
| * This function will not throw an %exception. |
| */ |
| template<typename _Res, typename... _Args> |
| inline void |
| swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) |
| { __x.swap(__y); } |
| } |
| |
| #endif // __GXX_EXPERIMENTAL_CXX0X__ |
| |
| #endif // _GLIBCXX_FUNCTIONAL |
