1*38fd1498Szrj// <experimental/iterator> -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj// Copyright (C) 2015-2018 Free Software Foundation, Inc. 4*38fd1498Szrj// 5*38fd1498Szrj// This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj// software; you can redistribute it and/or modify it under the 7*38fd1498Szrj// terms of the GNU General Public License as published by the 8*38fd1498Szrj// Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj// any later version. 10*38fd1498Szrj 11*38fd1498Szrj// This library is distributed in the hope that it will be useful, 12*38fd1498Szrj// but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj// GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj// Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj// permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj// 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj// You should have received a copy of the GNU General Public License and 21*38fd1498Szrj// a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj// <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj/** @file experimental/iterator 26*38fd1498Szrj * This is a TS C++ Library header. 27*38fd1498Szrj */ 28*38fd1498Szrj 29*38fd1498Szrj// 30*38fd1498Szrj// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2 31*38fd1498Szrj// 32*38fd1498Szrj 33*38fd1498Szrj#ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR 34*38fd1498Szrj#define _GLIBCXX_EXPERIMENTAL_ITERATOR 1 35*38fd1498Szrj 36*38fd1498Szrj#pragma GCC system_header 37*38fd1498Szrj 38*38fd1498Szrj#if __cplusplus >= 201402L 39*38fd1498Szrj 40*38fd1498Szrj#include <iterator> 41*38fd1498Szrj#include <iosfwd> 42*38fd1498Szrj#include <experimental/type_traits> 43*38fd1498Szrj 44*38fd1498Szrjnamespace std _GLIBCXX_VISIBILITY(default) 45*38fd1498Szrj{ 46*38fd1498Szrj_GLIBCXX_BEGIN_NAMESPACE_VERSION 47*38fd1498Szrj 48*38fd1498Szrjnamespace experimental 49*38fd1498Szrj{ 50*38fd1498Szrjinline namespace fundamentals_v2 51*38fd1498Szrj{ 52*38fd1498Szrj#define __cpp_lib_experimental_ostream_joiner 201411 53*38fd1498Szrj 54*38fd1498Szrj /// Output iterator that inserts a delimiter between elements. 55*38fd1498Szrj template<typename _DelimT, typename _CharT = char, 56*38fd1498Szrj typename _Traits = char_traits<_CharT>> 57*38fd1498Szrj class ostream_joiner 58*38fd1498Szrj { 59*38fd1498Szrj public: 60*38fd1498Szrj typedef _CharT char_type; 61*38fd1498Szrj typedef _Traits traits_type; 62*38fd1498Szrj typedef basic_ostream<_CharT, _Traits> ostream_type; 63*38fd1498Szrj typedef output_iterator_tag iterator_category; 64*38fd1498Szrj typedef void value_type; 65*38fd1498Szrj typedef void difference_type; 66*38fd1498Szrj typedef void pointer; 67*38fd1498Szrj typedef void reference; 68*38fd1498Szrj 69*38fd1498Szrj ostream_joiner(ostream_type& __os, const _DelimT& __delimiter) 70*38fd1498Szrj noexcept(is_nothrow_copy_constructible_v<_DelimT>) 71*38fd1498Szrj : _M_out(std::__addressof(__os)), _M_delim(__delimiter) 72*38fd1498Szrj { } 73*38fd1498Szrj 74*38fd1498Szrj ostream_joiner(ostream_type& __os, _DelimT&& __delimiter) 75*38fd1498Szrj noexcept(is_nothrow_move_constructible_v<_DelimT>) 76*38fd1498Szrj : _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter)) 77*38fd1498Szrj { } 78*38fd1498Szrj 79*38fd1498Szrj template<typename _Tp> 80*38fd1498Szrj ostream_joiner& 81*38fd1498Szrj operator=(const _Tp& __value) 82*38fd1498Szrj { 83*38fd1498Szrj if (!_M_first) 84*38fd1498Szrj *_M_out << _M_delim; 85*38fd1498Szrj _M_first = false; 86*38fd1498Szrj *_M_out << __value; 87*38fd1498Szrj return *this; 88*38fd1498Szrj } 89*38fd1498Szrj 90*38fd1498Szrj ostream_joiner& operator*() noexcept { return *this; } 91*38fd1498Szrj ostream_joiner& operator++() noexcept { return *this; } 92*38fd1498Szrj ostream_joiner& operator++(int) noexcept { return *this; } 93*38fd1498Szrj 94*38fd1498Szrj private: 95*38fd1498Szrj ostream_type* _M_out; 96*38fd1498Szrj _DelimT _M_delim; 97*38fd1498Szrj bool _M_first = true; 98*38fd1498Szrj }; 99*38fd1498Szrj 100*38fd1498Szrj /// Object generator for ostream_joiner. 101*38fd1498Szrj template<typename _CharT, typename _Traits, typename _DelimT> 102*38fd1498Szrj inline ostream_joiner<decay_t<_DelimT>, _CharT, _Traits> 103*38fd1498Szrj make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os, 104*38fd1498Szrj _DelimT&& __delimiter) 105*38fd1498Szrj { return { __os, std::forward<_DelimT>(__delimiter) }; } 106*38fd1498Szrj} // namespace fundamentals_v2 107*38fd1498Szrj} // namespace experimental 108*38fd1498Szrj 109*38fd1498Szrj_GLIBCXX_END_NAMESPACE_VERSION 110*38fd1498Szrj} // namespace std 111*38fd1498Szrj 112*38fd1498Szrj#endif // __cplusplus <= 201103L 113*38fd1498Szrj 114*38fd1498Szrj#endif // _GLIBCXX_EXPERIMENTAL_ITERATOR 115