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// Debugging array implementation -*- C++ -*-

// Copyright (C) 2012 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

// .

/** @file debug/array

 *  This is a Standard C++ Library header.

 */

#ifndef _GLIBCXX_DEBUG_ARRAY

#define _GLIBCXX_DEBUG_ARRAY 1

#pragma GCC system_header

#include 

namespace std _GLIBCXX_VISIBILITY(default)

{

namespace __debug

{

  template

    struct array

    {

      typedef _Tp                                     value_type;

      typedef value_type*                             pointer;

      typedef const value_type*                       const_pointer;

      typedef value_type&                   	      reference;

      typedef const value_type&             	      const_reference;

      typedef value_type*                             iterator;

      typedef const value_type*                       const_iterator;

      typedef std::size_t                             size_type;

      typedef std::ptrdiff_t                          difference_type;

      typedef std::reverse_iterator           reverse_iterator;

      typedef std::reverse_iterator   const_reverse_iterator;

      // Support for zero-sized arrays mandatory.

      typedef _GLIBCXX_STD_C::__array_traits<_Tp, _Nm> _AT_Type;

      typename _AT_Type::_Type                         _M_elems;

      template

        struct _Array_check_subscript

        {

          std::size_t size() { return _Size; }

          _Array_check_subscript(std::size_t __index)

          { __glibcxx_check_subscript(__index); }

        };

      template

        struct _Array_check_nonempty

        {

          bool empty() { return _Size == 0; }

          _Array_check_nonempty()

          { __glibcxx_check_nonempty(); }

        };

      // No explicit construct/copy/destroy for aggregate type.

      // DR 776.

      void

      fill(const value_type& __u)

      { std::fill_n(begin(), size(), __u); }

      void

      swap(array& __other)

      noexcept(noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>())))

      { std::swap_ranges(begin(), end(), __other.begin()); }

      // Iterators.

      iterator

      begin() noexcept

      { return iterator(data()); }

      const_iterator

      begin() const noexcept

      { return const_iterator(data()); }

      iterator

      end() noexcept

      { return iterator(data() + _Nm); }

      const_iterator

      end() const noexcept

      { return const_iterator(data() + _Nm); }

      reverse_iterator

      rbegin() noexcept

      { return reverse_iterator(end()); }

      const_reverse_iterator

      rbegin() const noexcept

      { return const_reverse_iterator(end()); }

      reverse_iterator

      rend() noexcept

      { return reverse_iterator(begin()); }

      const_reverse_iterator

      rend() const noexcept

      { return const_reverse_iterator(begin()); }

      const_iterator

      cbegin() const noexcept

      { return const_iterator(data()); }

      const_iterator

      cend() const noexcept

      { return const_iterator(data() + _Nm); }

      const_reverse_iterator

      crbegin() const noexcept

      { return const_reverse_iterator(end()); }

      const_reverse_iterator

      crend() const noexcept

      { return const_reverse_iterator(begin()); }

      // Capacity.

      constexpr size_type

      size() const noexcept { return _Nm; }

      constexpr size_type

      max_size() const noexcept { return _Nm; }

      constexpr bool

      empty() const noexcept { return size() == 0; }

      // Element access.

      reference

      operator[](size_type __n)

      {

        __glibcxx_check_subscript(__n);

        return _AT_Type::_S_ref(_M_elems, __n);

      }

      constexpr const_reference

      operator[](size_type __n) const noexcept

      {

        return __n < _Nm ? _AT_Type::_S_ref(_M_elems, __n)

         : (_GLIBCXX_THROW_OR_ABORT(_Array_check_subscript<_Nm>(__n)),

            _AT_Type::_S_ref(_M_elems, 0));

      }

      reference

      at(size_type __n)

      {

        if (__n >= _Nm)

          std::__throw_out_of_range(__N("array::at"));

        return _AT_Type::_S_ref(_M_elems, __n);

      }

      constexpr const_reference

      at(size_type __n) const

      {

        // Result of conditional expression must be an lvalue so use

        // boolean ? lvalue : (throw-expr, lvalue)

        return __n < _Nm ? _AT_Type::_S_ref(_M_elems, __n)

          : (std::__throw_out_of_range(__N("array::at")),

             _AT_Type::_S_ref(_M_elems, 0));

      }

      reference

      front()

      {

        __glibcxx_check_nonempty();

        return *begin();

      }

      constexpr const_reference

      front() const

      {

        return _Nm ? _AT_Type::_S_ref(_M_elems, 0)

          : (_GLIBCXX_THROW_OR_ABORT(_Array_check_nonempty<_Nm>()),

             _AT_Type::_S_ref(_M_elems, 0));

      }

      reference

      back()

      {

        __glibcxx_check_nonempty();

        return _Nm ? *(end() - 1) : *end();

      }

      constexpr const_reference

      back() const

      {

        return _Nm ? _AT_Type::_S_ref(_M_elems, _Nm - 1)

          : (_GLIBCXX_THROW_OR_ABORT(_Array_check_nonempty<_Nm>()),

             _AT_Type::_S_ref(_M_elems, 0));

      }

      pointer

      data() noexcept

      { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); }

      const_pointer

      data() const noexcept

      { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); }

    };

  // Array comparisons.

  template

    inline bool

    operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)

    { return std::equal(__one.begin(), __one.end(), __two.begin()); }

  template

    inline bool

    operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)

    { return !(__one == __two); }

  template

    inline bool

    operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)

    {

      return std::lexicographical_compare(__a.begin(), __a.end(),

                                          __b.begin(), __b.end());

    }

  template

    inline bool

    operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)

    { return __two < __one; }

  template

    inline bool

    operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)

    { return !(__one > __two); }

  template

    inline bool

    operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)

    { return !(__one < __two); }

  // Specialized algorithms.

  template

    inline void

    swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)

    noexcept(noexcept(__one.swap(__two)))

    { __one.swap(__two); }

  template

    constexpr _Tp&

    get(array<_Tp, _Nm>& __arr) noexcept

    {

      static_assert(_Int < _Nm, "index is out of bounds");

      return _GLIBCXX_STD_C::__array_traits<_Tp, _Nm>::

        _S_ref(__arr._M_elems, _Int);

    }

  template

    constexpr _Tp&&

    get(array<_Tp, _Nm>&& __arr) noexcept

    {

      static_assert(_Int < _Nm, "index is out of bounds");

      return std::move(get<_Int>(__arr));

    }

  template

    constexpr const _Tp&

    get(const array<_Tp, _Nm>& __arr) noexcept

    {

      static_assert(_Int < _Nm, "index is out of bounds");

      return _GLIBCXX_STD_C::__array_traits<_Tp, _Nm>::

        _S_ref(__arr._M_elems, _Int);

    }

} // namespace __debug

  // Tuple interface to class template array.

  /// tuple_size

  template

    class tuple_size;

  template

    struct tuple_size<__debug::array<_Tp, _Nm>>

    : public integral_constant { };

  /// tuple_element

  template

    class tuple_element;

  template

    struct tuple_element<_Int, __debug::array<_Tp, _Nm>>

    {

      static_assert(_Int < _Nm, "index is out of bounds");

      typedef _Tp type;

    };

} // namespace std

#endif // _GLIBCXX_DEBUG_ARRAY