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// Debugging vector implementation -*- C++ -*-

// Copyright (C) 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/>.

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

#ifndef _GLIBCXX_DEBUG_VECTOR
#define _GLIBCXX_DEBUG_VECTOR 1

#include <vector>
#include <utility>
#include <debug/safe_sequence.h>
#include <debug/safe_iterator.h>

namespace std
{
namespace __debug
{
  /// Class std::vector with safety/checking/debug instrumentation.
  template<typename _Tp,
           typename _Allocator = std::allocator<_Tp> >
    class vector
    : public _GLIBCXX_STD_D::vector<_Tp, _Allocator>,
      public __gnu_debug::_Safe_sequence<vector<_Tp, _Allocator> >
    {
      typedef _GLIBCXX_STD_D::vector<_Tp, _Allocator> _Base;
      typedef __gnu_debug::_Safe_sequence<vector>              _Safe_base;

      typedef typename _Base::const_iterator _Base_const_iterator;
      typedef __gnu_debug::_After_nth_from<_Base_const_iterator> _After_nth;

    public:
      typedef typename _Base::reference             reference;
      typedef typename _Base::const_reference       const_reference;

      typedef __gnu_debug::_Safe_iterator<typename _Base::iterator,vector>
      iterator;
      typedef __gnu_debug::_Safe_iterator<typename _Base::const_iterator,vector>
      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;

      // 23.2.4.1 construct/copy/destroy:
      explicit vector(const _Allocator& __a = _Allocator())
      : _Base(__a), _M_guaranteed_capacity(0) { }

      explicit vector(size_type __n, const _Tp& __value = _Tp(),
                      const _Allocator& __a = _Allocator())
      : _Base(__n, __value, __a), _M_guaranteed_capacity(__n) { }

      template<class _InputIterator>
        vector(_InputIterator __first, _InputIterator __last,
               const _Allocator& __a = _Allocator())
        : _Base(__gnu_debug::__check_valid_range(__first, __last),
                __last, __a),
          _M_guaranteed_capacity(0)
        { _M_update_guaranteed_capacity(); }

      vector(const vector& __x)
      : _Base(__x), _Safe_base(), _M_guaranteed_capacity(__x.size()) { }

      /// Construction from a release-mode vector
      vector(const _Base& __x)
      : _Base(__x), _Safe_base(), _M_guaranteed_capacity(__x.size()) { }

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      vector(vector&& __x)
      : _Base(std::forward<vector>(__x)), _Safe_base(),
        _M_guaranteed_capacity(this->size())
      {
        this->_M_swap(__x);
        __x._M_guaranteed_capacity = 0;
      }

      vector(initializer_list<value_type> __l,
             const allocator_type& __a = allocator_type())
      : _Base(__l, __a), _Safe_base(),
        _M_guaranteed_capacity(__l.size()) { }
#endif

      ~vector() { }

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

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      vector&
      operator=(vector&& __x)
      {
        // NB: DR 1204.
        // NB: DR 675.
        clear();
        swap(__x);
        return *this;
      }

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

      template<typename _InputIterator>
        void
        assign(_InputIterator __first, _InputIterator __last)
        {
          __glibcxx_check_valid_range(__first, __last);
          _Base::assign(__first, __last);
          this->_M_invalidate_all();
          _M_update_guaranteed_capacity();
        }

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

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      void
      assign(initializer_list<value_type> __l)
      {
        _Base::assign(__l);
        this->_M_invalidate_all();
        _M_update_guaranteed_capacity();
      }
#endif

      using _Base::get_allocator;

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

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

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

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

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

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

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

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

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      const_iterator
      cbegin() const
      { return const_iterator(_Base::begin(), this); }

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

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

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

      // 23.2.4.2 capacity:
      using _Base::size;
      using _Base::max_size;

      void
      resize(size_type __sz, _Tp __c = _Tp())
      {
        bool __realloc = _M_requires_reallocation(__sz);
        if (__sz < this->size())
          this->_M_invalidate_if(_After_nth(__sz, _M_base().begin()));
        _Base::resize(__sz, __c);
        if (__realloc)
          this->_M_invalidate_all();
        _M_update_guaranteed_capacity();
      }

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      using _Base::shrink_to_fit;
#endif

      size_type
      capacity() const
      {
#ifdef _GLIBCXX_DEBUG_PEDANTIC
        return _M_guaranteed_capacity;
#else
        return _Base::capacity();
#endif
      }

      using _Base::empty;

      void
      reserve(size_type __n)
      {
        bool __realloc = _M_requires_reallocation(__n);
        _Base::reserve(__n);
        if (__n > _M_guaranteed_capacity)
          _M_guaranteed_capacity = __n;
        if (__realloc)
          this->_M_invalidate_all();
      }

      // element access:
      reference
      operator[](size_type __n)
      {
        __glibcxx_check_subscript(__n);
        return _M_base()[__n];
      }

      const_reference
      operator[](size_type __n) const
      {
        __glibcxx_check_subscript(__n);
        return _M_base()[__n];
      }

      using _Base::at;

      reference
      front()
      {
        __glibcxx_check_nonempty();
        return _Base::front();
      }

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

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

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

      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // DR 464. Suggestion for new member functions in standard containers.
      using _Base::data;

      // 23.2.4.3 modifiers:
      void
      push_back(const _Tp& __x)
      {
        bool __realloc = _M_requires_reallocation(this->size() + 1);
        _Base::push_back(__x);
        if (__realloc)
          this->_M_invalidate_all();
        _M_update_guaranteed_capacity();
      }

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      template<typename _Up = _Tp>
        typename __gnu_cxx::__enable_if<!std::__are_same<_Up, bool>::__value,
                                        void>::__type
        push_back(_Tp&& __x)
        { emplace_back(std::move(__x)); }

      template<typename... _Args>
        void
        emplace_back(_Args&&... __args)
        {
          bool __realloc = _M_requires_reallocation(this->size() + 1);
          _Base::emplace_back(std::forward<_Args>(__args)...);
          if (__realloc)
            this->_M_invalidate_all();
          _M_update_guaranteed_capacity();
        }
#endif

      void
      pop_back()
      {
        __glibcxx_check_nonempty();
        iterator __victim = end() - 1;
        __victim._M_invalidate();
        _Base::pop_back();
      }

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      template<typename... _Args>
        iterator
        emplace(iterator __position, _Args&&... __args)
        {
          __glibcxx_check_insert(__position);
          bool __realloc = _M_requires_reallocation(this->size() + 1);
          difference_type __offset = __position - begin();
          typename _Base::iterator __res = _Base::emplace(__position.base(),
                                            std::forward<_Args>(__args)...);
          if (__realloc)
            this->_M_invalidate_all();
          else
            this->_M_invalidate_if(_After_nth(__offset, _M_base().begin()));
          _M_update_guaranteed_capacity();
          return iterator(__res, this);
        }
#endif

      iterator
      insert(iterator __position, const _Tp& __x)
      {
        __glibcxx_check_insert(__position);
        bool __realloc = _M_requires_reallocation(this->size() + 1);
        difference_type __offset = __position - begin();
        typename _Base::iterator __res = _Base::insert(__position.base(),__x);
        if (__realloc)
          this->_M_invalidate_all();
        else
          this->_M_invalidate_if(_After_nth(__offset, _M_base().begin()));
        _M_update_guaranteed_capacity();
        return iterator(__res, this);
      }

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      template<typename _Up = _Tp>
        typename __gnu_cxx::__enable_if<!std::__are_same<_Up, bool>::__value,
                                        iterator>::__type
        insert(iterator __position, _Tp&& __x)
        { return emplace(__position, std::move(__x)); }

      void
      insert(iterator __position, initializer_list<value_type> __l)
      { this->insert(__position, __l.begin(), __l.end()); }
#endif

      void
      insert(iterator __position, size_type __n, const _Tp& __x)
      {
        __glibcxx_check_insert(__position);
        bool __realloc = _M_requires_reallocation(this->size() + __n);
        difference_type __offset = __position - begin();
        _Base::insert(__position.base(), __n, __x);
        if (__realloc)
          this->_M_invalidate_all();
        else
          this->_M_invalidate_if(_After_nth(__offset, _M_base().begin()));
        _M_update_guaranteed_capacity();
      }

      template<class _InputIterator>
        void
        insert(iterator __position,
               _InputIterator __first, _InputIterator __last)
        {
          __glibcxx_check_insert_range(__position, __first, __last);

          /* Hard to guess if invalidation will occur, because __last
             - __first can't be calculated in all cases, so we just
             punt here by checking if it did occur. */
          typename _Base::iterator __old_begin = _M_base().begin();
          difference_type __offset = __position - begin();
          _Base::insert(__position.base(), __first, __last);

          if (_M_base().begin() != __old_begin)
            this->_M_invalidate_all();
          else
            this->_M_invalidate_if(_After_nth(__offset, _M_base().begin()));
          _M_update_guaranteed_capacity();
        }

      iterator
      erase(iterator __position)
      {
        __glibcxx_check_erase(__position);
        difference_type __offset = __position - begin();
        typename _Base::iterator __res = _Base::erase(__position.base());
        this->_M_invalidate_if(_After_nth(__offset, _M_base().begin()));
        return iterator(__res, this);
      }

      iterator
      erase(iterator __first, iterator __last)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 151. can't currently clear() empty container
        __glibcxx_check_erase_range(__first, __last);

        difference_type __offset = __first - begin();
        typename _Base::iterator __res = _Base::erase(__first.base(),
                                                         __last.base());
        this->_M_invalidate_if(_After_nth(__offset, _M_base().begin()));
        return iterator(__res, this);
      }

      void
      swap(vector& __x)
      {
        _Base::swap(__x);
        this->_M_swap(__x);
        std::swap(_M_guaranteed_capacity, __x._M_guaranteed_capacity);
      }

      void
      clear()
      {
        _Base::clear();
        this->_M_invalidate_all();
        _M_guaranteed_capacity = 0;
      }

      _Base&
      _M_base() { return *this; }

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

    private:
      size_type _M_guaranteed_capacity;

      bool
      _M_requires_reallocation(size_type __elements)
      { return __elements > this->capacity(); }

      void
      _M_update_guaranteed_capacity()
      {
        if (this->size() > _M_guaranteed_capacity)
          _M_guaranteed_capacity = this->size();
      }
    };

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

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

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

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

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

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

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

} // namespace __debug

#ifdef __GXX_EXPERIMENTAL_CXX0X__
  // DR 1182.
  /// std::hash specialization for vector<bool>.
  template<typename _Alloc>
    struct hash<__debug::vector<bool, _Alloc>>
    : public std::unary_function<__debug::vector<bool, _Alloc>, size_t>
    {
      size_t
      operator()(const __debug::vector<bool, _Alloc>& __b) const
      { return std::hash<_GLIBCXX_STD_D::vector<bool, _Alloc>>()
          (__b._M_base()); }
    };
#endif

} // namespace std

#endif