experimental/iterator
Go to the documentation of this file.
// <experimental/iterator> -*- C++ -*-
// Copyright (C) 2015-2022 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 experimental/iterator
* This is a TS C++ Library header.
* @ingroup libfund-ts
*/
//
// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
//
#ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR
#define _GLIBCXX_EXPERIMENTAL_ITERATOR 1
#pragma GCC system_header
#if __cplusplus >= 201402L
#include <iterator>
#include <iosfwd>
#include <experimental/type_traits>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace experimental
{
inline namespace fundamentals_v2
{
#define __cpp_lib_experimental_ostream_joiner 201411
/// Output iterator that inserts a delimiter between elements.
template<typename _DelimT, typename _CharT = char,
typename _Traits = char_traits<_CharT>>
class ostream_joiner
{
public:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef basic_ostream<_CharT, _Traits> ostream_type;
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
ostream_joiner(ostream_type& __os, const _DelimT& __delimiter)
noexcept(is_nothrow_copy_constructible_v<_DelimT>)
: _M_out(std::__addressof(__os)), _M_delim(__delimiter)
{ }
ostream_joiner(ostream_type& __os, _DelimT&& __delimiter)
noexcept(is_nothrow_move_constructible_v<_DelimT>)
: _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter))
{ }
template<typename _Tp>
ostream_joiner&
operator=(const _Tp& __value)
{
if (!_M_first)
*_M_out << _M_delim;
_M_first = false;
*_M_out << __value;
return *this;
}
ostream_joiner& operator*() noexcept { return *this; }
ostream_joiner& operator++() noexcept { return *this; }
ostream_joiner& operator++(int) noexcept { return *this; }
private:
ostream_type* _M_out;
_DelimT _M_delim;
bool _M_first = true;
};
/// Object generator for ostream_joiner.
template<typename _CharT, typename _Traits, typename _DelimT>
inline ostream_joiner<decay_t<_DelimT>, _CharT, _Traits>
make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os,
_DelimT&& __delimiter)
{ return { __os, std::forward<_DelimT>(__delimiter) }; }
} // namespace fundamentals_v2
} // namespace experimental
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // __cplusplus <= 201103L
#endif // _GLIBCXX_EXPERIMENTAL_ITERATOR