// Debugging list implementation -*- C++ -*-

// Copyright (C) 2003-2014 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/>.

/** @file debug/list
 *  This file is a GNU debug extension to the Standard C++ Library.
 */

#ifndef _GLIBCXX_DEBUG_LIST
#define _GLIBCXX_DEBUG_LIST 1

#include <list>
#include <debug/safe_sequence.h>
#include <debug/safe_iterator.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __debug
{
  /// Class std::list with safety/checking/debug instrumentation.
  template<typename _Tp, typename _Allocator = std::allocator<_Tp> >
    class list
    : public _GLIBCXX_STD_C::list<_Tp, _Allocator>,
      public __gnu_debug::_Safe_sequence<list<_Tp, _Allocator> >
    {
      typedef _GLIBCXX_STD_C::list<_Tp, _Allocator> _Base;

      typedef typename _Base::iterator       _Base_iterator;
      typedef typename _Base::const_iterator _Base_const_iterator;
      typedef __gnu_debug::_Equal_to<_Base_const_iterator> _Equal;
      typedef __gnu_debug::_Not_equal_to<_Base_const_iterator> _Not_equal;
    public:
      typedef typename _Base::reference             reference;
      typedef typename _Base::const_reference       const_reference;

      typedef __gnu_debug::_Safe_iterator<_Base_iterator, list>
						    iterator;
      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator, list>
						    const_iterator;

      typedef typename _Base::size_type             size_type;
      typedef typename _Base::difference_type       difference_type;

      typedef _Tp				    value_type;
      typedef _Allocator			    allocator_type;
      typedef typename _Base::pointer               pointer;
      typedef typename _Base::const_pointer         const_pointer;
      typedef std::reverse_iterator<iterator>       reverse_iterator;
      typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

      // 23.2.2.1 construct/copy/destroy:

      list() _GLIBCXX_NOEXCEPT
      : _Base() { }

      explicit
      list(const _Allocator& __a) _GLIBCXX_NOEXCEPT
      : _Base(__a) { }

#if __cplusplus >= 201103L
      explicit
      list(size_type __n)
      : _Base(__n) { }

      list(size_type __n, const _Tp& __value,
	   const _Allocator& __a = _Allocator())
      : _Base(__n, __value, __a) { }
#else
      explicit
      list(size_type __n, const _Tp& __value = _Tp(),
	   const _Allocator& __a = _Allocator())
      : _Base(__n, __value, __a) { }
#endif

#if __cplusplus >= 201103L
      template<class _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
#else
      template<class _InputIterator>
#endif
	list(_InputIterator __first, _InputIterator __last,
	     const _Allocator& __a = _Allocator())
	: _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
								     __last)),
		__gnu_debug::__base(__last), __a)
        { }

      list(const list& __x)
      : _Base(__x) { }

      list(const _Base& __x)
      : _Base(__x) { }

#if __cplusplus >= 201103L
      list(list&& __x) noexcept
      : _Base(std::move(__x))
      { this->_M_swap(__x); }

      list(initializer_list<value_type> __l,
           const allocator_type& __a = allocator_type())
        : _Base(__l, __a) { }
#endif

      ~list() _GLIBCXX_NOEXCEPT { }

      list&
      operator=(const list& __x)
      {
	static_cast<_Base&>(*this) = __x;
	this->_M_invalidate_all();
	return *this;
      }

#if __cplusplus >= 201103L
      list&
      operator=(list&& __x)
      {
	// NB: DR 1204.
	// NB: DR 675.
	__glibcxx_check_self_move_assign(__x);
	clear();
	swap(__x);
      	return *this;
      }

      list&
      operator=(initializer_list<value_type> __l)
      {
	static_cast<_Base&>(*this) = __l;
	this->_M_invalidate_all();
	return *this;
      }

      void
      assign(initializer_list<value_type> __l)
      {
	_Base::assign(__l);
	this->_M_invalidate_all();
      }
#endif

#if __cplusplus >= 201103L
      template<class _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
#else
      template<class _InputIterator>
#endif
        void
        assign(_InputIterator __first, _InputIterator __last)
        {
	  __glibcxx_check_valid_range(__first, __last);
	  _Base::assign(__gnu_debug::__base(__first),
			__gnu_debug::__base(__last));
	  this->_M_invalidate_all();
	}

      void
      assign(size_type __n, const _Tp& __t)
      {
	_Base::assign(__n, __t);
	this->_M_invalidate_all();
      }

      using _Base::get_allocator;

      // iterators:
      iterator
      begin() _GLIBCXX_NOEXCEPT
      { return iterator(_Base::begin(), this); }

      const_iterator
      begin() const _GLIBCXX_NOEXCEPT
      { return const_iterator(_Base::begin(), this); }

      iterator
      end() _GLIBCXX_NOEXCEPT
      { return iterator(_Base::end(), this); }

      const_iterator
      end() const _GLIBCXX_NOEXCEPT
      { return const_iterator(_Base::end(), this); }

      reverse_iterator
      rbegin() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(end()); }

      const_reverse_iterator
      rbegin() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(end()); }

      reverse_iterator
      rend() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(begin()); }

      const_reverse_iterator
      rend() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(begin()); }

#if __cplusplus >= 201103L
      const_iterator
      cbegin() const noexcept
      { return const_iterator(_Base::begin(), this); }

      const_iterator
      cend() const noexcept
      { return const_iterator(_Base::end(), this); }

      const_reverse_iterator
      crbegin() const noexcept
      { return const_reverse_iterator(end()); }

      const_reverse_iterator
      crend() const noexcept
      { return const_reverse_iterator(begin()); }
#endif

      // 23.2.2.2 capacity:
      using _Base::empty;
      using _Base::size;
      using _Base::max_size;

#if __cplusplus >= 201103L
      void
      resize(size_type __sz)
      {
	this->_M_detach_singular();

	// if __sz < size(), invalidate all iterators in [begin+__sz, end())
	_Base_iterator __victim = _Base::begin();
	_Base_iterator __end = _Base::end();
	for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
	  ++__victim;

	for (; __victim != __end; ++__victim)
	  {
	    this->_M_invalidate_if(_Equal(__victim));
	  }

	__try
	  {
	    _Base::resize(__sz);
	  }
	__catch(...)
	  {
	    this->_M_revalidate_singular();
	    __throw_exception_again;
	  }
      }

      void
      resize(size_type __sz, const _Tp& __c)
      {
	this->_M_detach_singular();

	// if __sz < size(), invalidate all iterators in [begin+__sz, end())
	_Base_iterator __victim = _Base::begin();
	_Base_iterator __end = _Base::end();
	for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
	  ++__victim;

	for (; __victim != __end; ++__victim)
	  {
	    this->_M_invalidate_if(_Equal(__victim));
	  }

	__try
	  {
	    _Base::resize(__sz, __c);
	  }
	__catch(...)
	  {
	    this->_M_revalidate_singular();
	    __throw_exception_again;
	  }
      }
#else
      void
      resize(size_type __sz, _Tp __c = _Tp())
      {
	this->_M_detach_singular();

	// if __sz < size(), invalidate all iterators in [begin+__sz, end())
	_Base_iterator __victim = _Base::begin();
	_Base_iterator __end = _Base::end();
	for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
	  ++__victim;

	for (; __victim != __end; ++__victim)
	  {
	    this->_M_invalidate_if(_Equal(__victim));
	  }

	__try
	  {
	    _Base::resize(__sz, __c);
	  }
	__catch(...)
	  {
	    this->_M_revalidate_singular();
	    __throw_exception_again;
	  }
      }
#endif

      // element access:
      reference
      front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::front();
      }

      const_reference
      front() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::front();
      }

      reference
      back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::back();
      }

      const_reference
      back() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::back();
      }

      // 23.2.2.3 modifiers:
      using _Base::push_front;

#if __cplusplus >= 201103L
      using _Base::emplace_front;
#endif

      void
      pop_front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	this->_M_invalidate_if(_Equal(_Base::begin()));
	_Base::pop_front();
      }

      using _Base::push_back;

#if __cplusplus >= 201103L
      using _Base::emplace_back;
#endif

      void
      pop_back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	this->_M_invalidate_if(_Equal(--_Base::end()));
	_Base::pop_back();
      }

#if __cplusplus >= 201103L
      template<typename... _Args>
        iterator
        emplace(const_iterator __position, _Args&&... __args)
	{
	  __glibcxx_check_insert(__position);
	  return iterator(_Base::emplace(__position.base(),
					std::forward<_Args>(__args)...), this);
	}
#endif

     iterator
#if __cplusplus >= 201103L
     insert(const_iterator __position, const _Tp& __x)
#else
     insert(iterator __position, const _Tp& __x)
#endif
     {
       __glibcxx_check_insert(__position);
       return iterator(_Base::insert(__position.base(), __x), this);
     }

#if __cplusplus >= 201103L
      iterator
      insert(const_iterator __position, _Tp&& __x)
      { return emplace(__position, std::move(__x)); }

      iterator
      insert(const_iterator __p, initializer_list<value_type> __l)
      {
	__glibcxx_check_insert(__p);
	return iterator(_Base::insert(__p.base(), __l), this);
      }
#endif

#if __cplusplus >= 201103L
      iterator
      insert(const_iterator __position, size_type __n, const _Tp& __x)
      {
	__glibcxx_check_insert(__position);
	return iterator(_Base::insert(__position.base(), __n, __x), this);
      }
#else
      void
      insert(iterator __position, size_type __n, const _Tp& __x)
      {
	__glibcxx_check_insert(__position);
	_Base::insert(__position.base(), __n, __x);
      }
#endif

#if __cplusplus >= 201103L
      template<class _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
	iterator
        insert(const_iterator __position, _InputIterator __first,
	       _InputIterator __last)
        {
	  __glibcxx_check_insert_range(__position, __first, __last);
	  return iterator(_Base::insert(__position.base(),
					__gnu_debug::__base(__first),
					__gnu_debug::__base(__last)),
			  this);
	}
#else
      template<class _InputIterator>
	void
        insert(iterator __position, _InputIterator __first,
	       _InputIterator __last)
        {
	  __glibcxx_check_insert_range(__position, __first, __last);
	  _Base::insert(__position.base(), __gnu_debug::__base(__first),
					   __gnu_debug::__base(__last));
	}
#endif

    private:
      _Base_iterator
#if __cplusplus >= 201103L
      _M_erase(_Base_const_iterator __position) noexcept
#else
      _M_erase(_Base_iterator __position)
#endif
      {
	this->_M_invalidate_if(_Equal(__position));
	return _Base::erase(__position);
      }

    public:
      iterator
#if __cplusplus >= 201103L
      erase(const_iterator __position) noexcept
#else
      erase(iterator __position)
#endif
      {
	__glibcxx_check_erase(__position);
	return iterator(_M_erase(__position.base()), this);
      }

      iterator
#if __cplusplus >= 201103L
      erase(const_iterator __first, const_iterator __last) noexcept
#else
      erase(iterator __first, iterator __last)
#endif
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 151. can't currently clear() empty container
	__glibcxx_check_erase_range(__first, __last);
	for (_Base_const_iterator __victim = __first.base();
	     __victim != __last.base(); ++__victim)
	  {
	    _GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),
			          _M_message(__gnu_debug::__msg_valid_range)
				  ._M_iterator(__first, "position")
				  ._M_iterator(__last, "last"));
	    this->_M_invalidate_if(_Equal(__victim));
	  }
	return iterator(_Base::erase(__first.base(), __last.base()), this);
      }

      void
      swap(list& __x)
      {
	_Base::swap(__x);
	this->_M_swap(__x);
      }

      void
      clear() _GLIBCXX_NOEXCEPT
      {
	_Base::clear();
	this->_M_invalidate_all();
      }

      // 23.2.2.4 list operations:
      void
#if __cplusplus >= 201103L
      splice(const_iterator __position, list&& __x) noexcept
#else
      splice(iterator __position, list& __x)
#endif
      {
	_GLIBCXX_DEBUG_VERIFY(&__x != this,
			      _M_message(__gnu_debug::__msg_self_splice)
			      ._M_sequence(*this, "this"));
	this->_M_transfer_from_if(__x, _Not_equal(__x._M_base().end()));
	_Base::splice(__position.base(), _GLIBCXX_MOVE(__x._M_base()));
      }

#if __cplusplus >= 201103L
      void
      splice(const_iterator __position, list& __x) noexcept
      { splice(__position, std::move(__x)); }
#endif

      void
#if __cplusplus >= 201103L
      splice(const_iterator __position, list&& __x, const_iterator __i) noexcept
#else
      splice(iterator __position, list& __x, iterator __i)
#endif
      {
	__glibcxx_check_insert(__position);

	// We used to perform the splice_alloc check:  not anymore, redundant
	// after implementing the relevant bits of N1599.

	_GLIBCXX_DEBUG_VERIFY(__i._M_dereferenceable(),
			      _M_message(__gnu_debug::__msg_splice_bad)
			      ._M_iterator(__i, "__i"));
	_GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(&__x),
			      _M_message(__gnu_debug::__msg_splice_other)
			     ._M_iterator(__i, "__i")._M_sequence(__x, "__x"));

	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 250. splicing invalidates iterators
	this->_M_transfer_from_if(__x, _Equal(__i.base()));
	_Base::splice(__position.base(), _GLIBCXX_MOVE(__x._M_base()),
		      __i.base());
      }

#if __cplusplus >= 201103L
      void
      splice(const_iterator __position, list& __x, const_iterator __i) noexcept
      { splice(__position, std::move(__x), __i); }
#endif

      void
#if __cplusplus >= 201103L
      splice(const_iterator __position, list&& __x, const_iterator __first,
	     const_iterator __last) noexcept
#else
      splice(iterator __position, list& __x, iterator __first,
	     iterator __last)
#endif
      {
	__glibcxx_check_insert(__position);
	__glibcxx_check_valid_range(__first, __last);
	_GLIBCXX_DEBUG_VERIFY(__first._M_attached_to(&__x),
			      _M_message(__gnu_debug::__msg_splice_other)
			      ._M_sequence(__x, "x")
			      ._M_iterator(__first, "first"));

	// We used to perform the splice_alloc check:  not anymore, redundant
	// after implementing the relevant bits of N1599.

	for (_Base_const_iterator __tmp = __first.base();
	     __tmp != __last.base(); ++__tmp)
	  {
	    _GLIBCXX_DEBUG_VERIFY(__tmp != _Base::end(),
				  _M_message(__gnu_debug::__msg_valid_range)
				  ._M_iterator(__first, "first")
				  ._M_iterator(__last, "last"));
	    _GLIBCXX_DEBUG_VERIFY(&__x != this || __tmp != __position.base(),
				_M_message(__gnu_debug::__msg_splice_overlap)
				  ._M_iterator(__tmp, "position")
				  ._M_iterator(__first, "first")
				  ._M_iterator(__last, "last"));
	    // _GLIBCXX_RESOLVE_LIB_DEFECTS
	    // 250. splicing invalidates iterators
	    this->_M_transfer_from_if(__x, _Equal(__tmp));
	  }

	_Base::splice(__position.base(), _GLIBCXX_MOVE(__x._M_base()),
		      __first.base(), __last.base());
      }

#if __cplusplus >= 201103L
      void
      splice(const_iterator __position, list& __x,
	     const_iterator __first, const_iterator __last) noexcept
      { splice(__position, std::move(__x), __first, __last); }
#endif

      void
      remove(const _Tp& __value)
      {
	for (_Base_iterator __x = _Base::begin(); __x != _Base::end(); )
	  {
	    if (*__x == __value)
	      __x = _M_erase(__x);
	    else
	      ++__x;
	  }
      }

      template<class _Predicate>
        void
        remove_if(_Predicate __pred)
        {
	  for (_Base_iterator __x = _Base::begin(); __x != _Base::end(); )
	    {
	      if (__pred(*__x))
		__x = _M_erase(__x);
	      else
		++__x;
	    }
	}

      void
      unique()
      {
	_Base_iterator __first = _Base::begin();
	_Base_iterator __last = _Base::end();
	if (__first == __last)
	  return;
	_Base_iterator __next = __first; ++__next;
	while (__next != __last)
	  {
	    if (*__first == *__next)
	      __next = _M_erase(__next);
	    else
	      __first = __next++;
	  }
      }

      template<class _BinaryPredicate>
        void
        unique(_BinaryPredicate __binary_pred)
        {
	  _Base_iterator __first = _Base::begin();
	  _Base_iterator __last = _Base::end();
	  if (__first == __last)
	    return;
	  _Base_iterator __next = __first; ++__next;
	  while (__next != __last)
	    {
	      if (__binary_pred(*__first, *__next))
		__next = _M_erase(__next);
	      else
		__first = __next++;
	    }
	}

      void
#if __cplusplus >= 201103L
      merge(list&& __x)
#else
      merge(list& __x)
#endif
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 300. list::merge() specification incomplete
	if (this != &__x)
	  {
	    __glibcxx_check_sorted(_Base::begin(), _Base::end());
	    __glibcxx_check_sorted(__x.begin().base(), __x.end().base());
	    this->_M_transfer_from_if(__x, _Not_equal(__x._M_base().end()));
	    _Base::merge(_GLIBCXX_MOVE(__x._M_base()));
	  }
      }

#if __cplusplus >= 201103L
      void
      merge(list& __x)
      { merge(std::move(__x)); }
#endif

      template<class _Compare>
        void
#if __cplusplus >= 201103L
        merge(list&& __x, _Compare __comp)
#else
        merge(list& __x, _Compare __comp)
#endif
        {
	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
	  // 300. list::merge() specification incomplete
	  if (this != &__x)
	    {
	      __glibcxx_check_sorted_pred(_Base::begin(), _Base::end(),
					  __comp);
	      __glibcxx_check_sorted_pred(__x.begin().base(), __x.end().base(),
					  __comp);
	      this->_M_transfer_from_if(__x, _Not_equal(__x._M_base().end()));
	      _Base::merge(_GLIBCXX_MOVE(__x._M_base()), __comp);
	    }
	}

#if __cplusplus >= 201103L
      template<typename _Compare>
        void
        merge(list& __x, _Compare __comp)
        { merge(std::move(__x), __comp); }
#endif

      void
      sort() { _Base::sort(); }

      template<typename _StrictWeakOrdering>
        void
        sort(_StrictWeakOrdering __pred) { _Base::sort(__pred); }

      using _Base::reverse;

      _Base&
      _M_base() _GLIBCXX_NOEXCEPT       { return *this; }

      const _Base&
      _M_base() const _GLIBCXX_NOEXCEPT { return *this; }

    private:
      void
      _M_invalidate_all()
      {
	this->_M_invalidate_if(_Not_equal(_Base::end()));
      }
    };

  template<typename _Tp, typename _Alloc>
    inline bool
    operator==(const list<_Tp, _Alloc>& __lhs,
	       const list<_Tp, _Alloc>& __rhs)
    { return __lhs._M_base() == __rhs._M_base(); }

  template<typename _Tp, typename _Alloc>
    inline bool
    operator!=(const list<_Tp, _Alloc>& __lhs,
	       const list<_Tp, _Alloc>& __rhs)
    { return __lhs._M_base() != __rhs._M_base(); }

  template<typename _Tp, typename _Alloc>
    inline bool
    operator<(const list<_Tp, _Alloc>& __lhs,
	      const list<_Tp, _Alloc>& __rhs)
    { return __lhs._M_base() < __rhs._M_base(); }

  template<typename _Tp, typename _Alloc>
    inline bool
    operator<=(const list<_Tp, _Alloc>& __lhs,
	       const list<_Tp, _Alloc>& __rhs)
    { return __lhs._M_base() <= __rhs._M_base(); }

  template<typename _Tp, typename _Alloc>
    inline bool
    operator>=(const list<_Tp, _Alloc>& __lhs,
	       const list<_Tp, _Alloc>& __rhs)
    { return __lhs._M_base() >= __rhs._M_base(); }

  template<typename _Tp, typename _Alloc>
    inline bool
    operator>(const list<_Tp, _Alloc>& __lhs,
	      const list<_Tp, _Alloc>& __rhs)
    { return __lhs._M_base() > __rhs._M_base(); }

  template<typename _Tp, typename _Alloc>
    inline void
    swap(list<_Tp, _Alloc>& __lhs, list<_Tp, _Alloc>& __rhs)
    { __lhs.swap(__rhs); }

} // namespace __debug
} // namespace std

#ifndef _GLIBCXX_DEBUG_PEDANTIC
namespace __gnu_debug
{
  template<class _Tp, class _Alloc>
    struct _Insert_range_from_self_is_safe<std::__debug::list<_Tp, _Alloc> >
    { enum { __value = 1 }; };
}
#endif

#endif