libstdc++-v3/libsupc++/initializer_list

   1 // std::initializer_list support -*- C++ -*-
   2
   3 // Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4 //
   5 // This file is part of GCC.
   6 //
   7 // GCC is free software; you can redistribute it and/or modify
   8 // it under the terms of the GNU General Public License as published by
   9 // the Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // GCC is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 /** @file initializer_list
  27  *  This is a Standard C++ Library header.
  28  */
  29
  30 #ifndef _INITIALIZER_LIST
  31 #define _INITIALIZER_LIST
  32
  33 #pragma GCC system_header
  34
  35 #ifdef __GXX_EXPERIMENTAL_CXX0X__
  36
  37 #pragma GCC visibility push(default)
  38
  39 #include <bits/c++config.h>
  40
  41 namespace std
  42 {
  43   /// initializer_list
  44   template<class _E>
  45     class initializer_list
  46     {
  47     public:
  48       typedef _E                value_type;
  49       typedef const _E&         reference;
  50       typedef const _E&         const_reference;
  51       typedef size_t            size_type;
  52       typedef const _E*         iterator;
  53       typedef const _E*         const_iterator;
  54
  55     private:
  56       iterator                  _M_array;
  57       size_type                 _M_len;
  58
  59       // The compiler can call a private constructor.
  60       constexpr initializer_list(const_iterator __a, size_type __l)
  61       : _M_array(__a), _M_len(__l) { }
  62
  63     public:
  64       constexpr initializer_list() noexcept
  65       : _M_array(0), _M_len(0) { }
  66
  67       // Number of elements.
  68       constexpr size_type
  69       size() const noexcept { return _M_len; }
  70
  71       // First element.
  72       constexpr const_iterator
  73       begin() const noexcept { return _M_array; }
  74
  75       // One past the last element.
  76       constexpr const_iterator
  77       end() const noexcept { return begin() + size(); }
  78   };
  79
  80   /**
  81    *  @brief  Return an iterator pointing to the first element of
  82    *          the initilizer_list.
  83    *  @param  __ils  Initializer list.
  84    */
  85   template<class _Tp>
  86     constexpr const _Tp*
  87     begin(initializer_list<_Tp> __ils) noexcept
  88     { return __ils.begin(); }
  89
  90   /**
  91    *  @brief  Return an iterator pointing to one past the last element
  92    *          of the initilizer_list.
  93    *  @param  __ils  Initializer list.
  94    */
  95   template<class _Tp>
  96     constexpr const _Tp*
  97     end(initializer_list<_Tp> __ils) noexcept
  98     { return __ils.end(); }
  99 }
 100
 101 #pragma GCC visibility pop
 102 #endif // C++0x
 103 #endif // _INITIALIZER_LIST