array

Go to the documentation of this file.

// class template array -*- C++ -*-

// Copyright (C) 2004, 2005, 2006 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

#ifndef _ARRAY
#define _ARRAY 1

#include <new>
#include <iterator>
#include <algorithm>
#include <cstddef>
#include <bits/functexcept.h>

//namespace std::tr1
namespace std
{
namespace tr1
{
  template<typename _Tp, std::size_t _Nm>
    struct array
    {
      typedef _Tp                         value_type;
      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<iterator>         reverse_iterator;
      typedef std::reverse_iterator<const_iterator>   const_reverse_iterator;

      // Support for zero-sized arrays mandatory.
      value_type _M_instance[_Nm ? _Nm : 1] __attribute__((__aligned__));

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

      void 
      assign(const value_type& __u)
      { std::fill_n(begin(), size(), __u); }

      void 
      swap(array& __other)
      { std::swap_ranges(begin(), end(), __other.begin()); }

      // Iterators.
      iterator
      begin()
      { return iterator(&_M_instance[0]); }

      const_iterator
      begin() const 
      { return const_iterator(&_M_instance[0]); }

      iterator
      end() 
      { return iterator(&_M_instance[_Nm]); }

      const_iterator
      end() const
      { return const_iterator(&_M_instance[_Nm]); }

      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()); }

      // Capacity.
      size_type 
      size() const { return _Nm; }

      size_type 
      max_size() const { return _Nm; }

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

      // Element access.
      reference
      operator[](size_type __n)
      { return _M_instance[__n]; }

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

      reference
      at(size_type __n)
      { return _M_at<_Nm>(__n); }

      const_reference
      at(size_type __n) const
      { return _M_at<_Nm>(__n); }

      reference 
      front()
      { return *begin(); }

      const_reference 
      front() const
      { return *begin(); }

      reference 
      back()
      { return _Nm ? *(end() - 1) : *end(); }

      const_reference 
      back() const
      { return _Nm ? *(end() - 1) : *end(); }

      _Tp* 
      data()
      { return &_M_instance[0]; }

      const _Tp* 
      data() const
      { return &_M_instance[0]; }

    private:
      template<std::size_t _Mm>
        typename std::__enable_if<reference, _Mm>::__type
        _M_at(size_type __n)
        {
      if (__builtin_expect(__n >= _Mm, false))
        std::__throw_out_of_range("array::_M_at");
      return _M_instance[__n];
    }

      // Avoid "unsigned comparison with zero" warnings.
      template<std::size_t _Mm>
        typename std::__enable_if<reference, !_Mm>::__type
        _M_at(size_type)
        {
      std::__throw_out_of_range("array::_M_at");
      return _M_instance[0];
    }

      template<std::size_t _Mm>
        typename std::__enable_if<const_reference, _Mm>::__type
        _M_at(size_type __n) const
        {
      if (__builtin_expect(__n >= _Mm, false))
        std::__throw_out_of_range("array::_M_at");
      return _M_instance[__n];
    }

      template<std::size_t _Mm>
        typename std::__enable_if<const_reference, !_Mm>::__type
        _M_at(size_type) const
        {
      std::__throw_out_of_range("array::_M_at");
      return _M_instance[0];
    }     
    };

  // Array comparisons.
  template<typename _Tp, std::size_t _Nm>
    inline bool 
    operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
    { return std::equal(__one.begin(), __one.end(), __two.begin()); }

  template<typename _Tp, std::size_t _Nm>
    inline bool
    operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
    { return !(__one == __two); }

  template<typename _Tp, std::size_t _Nm>
    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<typename _Tp, std::size_t _Nm>
    inline bool
    operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
    { return __two < __one; }

  template<typename _Tp, std::size_t _Nm>
    inline bool
    operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
    { return !(__one > __two); }

  template<typename _Tp, std::size_t _Nm>
    inline bool
    operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
    { return !(__one < __two); }

  // Specialized algorithms [6.2.2.2].
  template<typename _Tp, std::size_t _Nm>
    inline void
    swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
    { std::swap_ranges(__one.begin(), __one.end(), __two.begin()); }

  // Tuple interface to class template array [6.2.2.5].
  template<typename _Tp> class tuple_size;
  template<int _Int, typename _Tp> class tuple_element;

  template<typename _Tp, std::size_t _Nm>
    struct tuple_size<array<_Tp, _Nm> >
    { static const int value = _Nm; };

  template<int _Int, typename _Tp, std::size_t _Nm>
    struct tuple_element<_Int, array<_Tp, _Nm> >
    { typedef _Tp type; };

  template<int _Int, typename _Tp, std::size_t _Nm>
    inline _Tp&
    get(array<_Tp, _Nm>& __arr)
    { return __arr[_Int]; }

  template<int _Int, typename _Tp, std::size_t _Nm>
    inline const _Tp&
    get(const array<_Tp, _Nm>& __arr)
    { return __arr[_Int]; }
} // namespace std::tr1
}

#endif

---