118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
// <experimental/iterator> -*- C++ -*-
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// Copyright (C) 2015-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file experimental/iterator
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* This is a TS C++ Library header.
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*/
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//
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// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
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//
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#ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR
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#define _GLIBCXX_EXPERIMENTAL_ITERATOR 1
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#pragma GCC system_header
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#if __cplusplus <= 201103L
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# include <bits/c++14_warning.h>
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#else
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#include <experimental/type_traits>
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#include <iosfwd>
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#include <bits/move.h>
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#include <bits/stl_iterator_base_types.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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namespace experimental
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{
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inline namespace fundamentals_v2
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#define __cpp_lib_experimental_ostream_joiner 201411
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/// Output iterator that inserts a delimiter between elements.
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template<typename _DelimT, typename _CharT = char,
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typename _Traits = char_traits<_CharT>>
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class ostream_joiner
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{
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public:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_ostream<_CharT, _Traits> ostream_type;
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typedef output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void difference_type;
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typedef void pointer;
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typedef void reference;
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ostream_joiner(ostream_type& __os, const _DelimT& __delimiter)
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noexcept(is_nothrow_copy_constructible_v<_DelimT>)
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: _M_out(std::__addressof(__os)), _M_delim(__delimiter)
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{ }
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ostream_joiner(ostream_type& __os, _DelimT&& __delimiter)
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noexcept(is_nothrow_move_constructible_v<_DelimT>)
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: _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter))
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{ }
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template<typename _Tp>
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ostream_joiner&
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operator=(const _Tp& __value)
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{
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if (!_M_first)
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*_M_out << _M_delim;
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_M_first = false;
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*_M_out << __value;
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return *this;
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}
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ostream_joiner& operator*() noexcept { return *this; }
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ostream_joiner& operator++() noexcept { return *this; }
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ostream_joiner& operator++(int) noexcept { return *this; }
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private:
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ostream_type* _M_out;
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_DelimT _M_delim;
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bool _M_first = true;
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};
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/// Object generator for ostream_joiner.
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template<typename _CharT, typename _Traits, typename _DelimT>
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inline ostream_joiner<decay_t<_DelimT>, _CharT, _Traits>
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make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os,
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_DelimT&& __delimiter)
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{ return { __os, std::forward<_DelimT>(__delimiter) }; }
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace fundamentals_v2
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} // namespace experimental
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} // namespace std
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#endif // __cplusplus <= 201103L
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#endif // _GLIBCXX_EXPERIMENTAL_ITERATOR
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