initializer_list.hpp

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// Author:  Mario S. Könz <mskoenz@gmx.net>
// Date:    18.11.2013 23:04:55 CET
// File:    initializer_list.hpp

#ifndef __INITIALIZER_LIST_HEADER
#define __INITIALIZER_LIST_HEADER

namespace std
{
  template<class _E>
    class initializer_list
    {
    public:
      typedef _E                value_type;
      typedef const _E&         reference;
      typedef const _E&         const_reference;
      typedef size_t            size_type;
      typedef const _E*         iterator;
      typedef const _E*         const_iterator;

    private:
      iterator                  _M_array;
      size_type                 _M_len;

      // The compiler can call a private constructor.
      constexpr initializer_list(const_iterator __a, size_type __l)
      : _M_array(__a), _M_len(__l) { }

    public:
      constexpr initializer_list() noexcept
      : _M_array(0), _M_len(0) { }

      // Number of elements.
      constexpr size_type
      size() const noexcept { return _M_len; }

      // First element.
      constexpr const_iterator
      begin() const noexcept { return _M_array; }

      // One past the last element.
      constexpr const_iterator
      end() const noexcept { return begin() + size(); }
    };

  template<class _Tp>
    constexpr const _Tp*
    begin(initializer_list<_Tp> __ils) noexcept
    { return __ils.begin(); }

  template<class _Tp>
    constexpr const _Tp*
    end(initializer_list<_Tp> __ils) noexcept
    { return __ils.end(); }
}

#endif //__INITIALIZER_LIST_HEADER