| // <experimental/iterator> -*- C++ -*- |
| |
| // Copyright (C) 2015-2021 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 |