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// Streambuf iterators |
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|
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// Copyright (C) 1997-2021 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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|
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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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|
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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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|
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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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|
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/** @file bits/streambuf_iterator.h |
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* This is an internal header file, included by other library headers. |
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* Do not attempt to use it directly. @headername{iterator} |
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*/ |
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|
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#ifndef _STREAMBUF_ITERATOR_H |
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#define _STREAMBUF_ITERATOR_H 1 |
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|
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#pragma GCC system_header |
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|
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#include <streambuf> |
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#include <debug/debug.h> |
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|
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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/** |
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* @addtogroup iterators |
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* @{ |
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*/ |
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|
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// 24.5.3 Template class istreambuf_iterator |
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/// Provides input iterator semantics for streambufs. |
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template<typename _CharT, typename _Traits> |
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class istreambuf_iterator |
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: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, |
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_CharT*, _CharT> |
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{ |
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public: |
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// Types: |
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///@{ |
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/// Public typedefs |
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#if __cplusplus < 201103L |
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typedef _CharT& reference; // Changed to _CharT by LWG 445 |
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#elif __cplusplus > 201703L |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 3188. istreambuf_iterator::pointer should not be unspecified |
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using pointer = void; |
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#endif |
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|
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typedef _CharT char_type; |
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typedef _Traits traits_type; |
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typedef typename _Traits::int_type int_type; |
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typedef basic_streambuf<_CharT, _Traits> streambuf_type; |
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typedef basic_istream<_CharT, _Traits> istream_type; |
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///@} |
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|
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template<typename _CharT2> |
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
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ostreambuf_iterator<_CharT2> >::__type |
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copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
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ostreambuf_iterator<_CharT2>); |
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|
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template<bool _IsMove, typename _CharT2> |
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
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_CharT2*>::__type |
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__copy_move_a2(istreambuf_iterator<_CharT2>, |
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istreambuf_iterator<_CharT2>, _CharT2*); |
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|
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template<typename _CharT2, typename _Size> |
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
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_CharT2*>::__type |
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__copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool); |
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|
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template<typename _CharT2> |
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
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istreambuf_iterator<_CharT2> >::__type |
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find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
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const _CharT2&); |
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|
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template<typename _CharT2, typename _Distance> |
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
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void>::__type |
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advance(istreambuf_iterator<_CharT2>&, _Distance); |
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|
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private: |
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// 24.5.3 istreambuf_iterator |
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// p 1 |
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// If the end of stream is reached (streambuf_type::sgetc() |
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// returns traits_type::eof()), the iterator becomes equal to |
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// the "end of stream" iterator value. |
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// NB: This implementation assumes the "end of stream" value |
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// is EOF, or -1. |
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mutable streambuf_type* _M_sbuf; |
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int_type _M_c; |
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|
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public: |
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/// Construct end of input stream iterator. |
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_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT |
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: _M_sbuf(0), _M_c(traits_type::eof()) { } |
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|
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#if __cplusplus > 201703L && __cpp_lib_concepts |
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constexpr istreambuf_iterator(default_sentinel_t) noexcept |
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: istreambuf_iterator() { } |
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#endif |
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|
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#if __cplusplus >= 201103L |
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istreambuf_iterator(const istreambuf_iterator&) noexcept = default; |
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|
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~istreambuf_iterator() = default; |
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#endif |
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|
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/// Construct start of input stream iterator. |
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istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT |
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: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { } |
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|
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/// Construct start of streambuf iterator. |
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istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT |
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: _M_sbuf(__s), _M_c(traits_type::eof()) { } |
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|
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#if __cplusplus >= 201103L |
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istreambuf_iterator& |
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operator=(const istreambuf_iterator&) noexcept = default; |
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#endif |
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|
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/// Return the current character pointed to by iterator. This returns |
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/// streambuf.sgetc(). It cannot be assigned. NB: The result of |
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/// operator*() on an end of stream is undefined. |
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char_type |
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operator*() const |
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{ |
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int_type __c = _M_get(); |
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|
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#ifdef _GLIBCXX_DEBUG_PEDANTIC |
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// Dereferencing a past-the-end istreambuf_iterator is a |
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// libstdc++ extension |
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__glibcxx_requires_cond(!_S_is_eof(__c), |
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_M_message(__gnu_debug::__msg_deref_istreambuf) |
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._M_iterator(*this)); |
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#endif |
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return traits_type::to_char_type(__c); |
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} |
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|
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/// Advance the iterator. Calls streambuf.sbumpc(). |
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istreambuf_iterator& |
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operator++() |
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{ |
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__glibcxx_requires_cond(_M_sbuf && |
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(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), |
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_M_message(__gnu_debug::__msg_inc_istreambuf) |
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._M_iterator(*this)); |
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|
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_M_sbuf->sbumpc(); |
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_M_c = traits_type::eof(); |
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return *this; |
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} |
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|
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/// Advance the iterator. Calls streambuf.sbumpc(). |
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istreambuf_iterator |
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operator++(int) |
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{ |
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__glibcxx_requires_cond(_M_sbuf && |
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(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), |
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_M_message(__gnu_debug::__msg_inc_istreambuf) |
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._M_iterator(*this)); |
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|
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istreambuf_iterator __old = *this; |
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__old._M_c = _M_sbuf->sbumpc(); |
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_M_c = traits_type::eof(); |
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return __old; |
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} |
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|
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 110 istreambuf_iterator::equal not const |
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// NB: there is also number 111 (NAD) relevant to this function. |
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/// Return true both iterators are end or both are not end. |
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bool |
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equal(const istreambuf_iterator& __b) const |
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{ return _M_at_eof() == __b._M_at_eof(); } |
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|
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private: |
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int_type |
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_M_get() const |
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{ |
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int_type __ret = _M_c; |
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if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc())) |
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_M_sbuf = 0; |
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return __ret; |
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} |
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|
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bool |
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_M_at_eof() const |
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{ return _S_is_eof(_M_get()); } |
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|
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static bool |
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_S_is_eof(int_type __c) |
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{ |
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const int_type __eof = traits_type::eof(); |
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return traits_type::eq_int_type(__c, __eof); |
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} |
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|
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#if __cplusplus > 201703L && __cpp_lib_concepts |
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friend bool |
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operator==(const istreambuf_iterator& __i, default_sentinel_t __s) |
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{ return __i._M_at_eof(); } |
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#endif |
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}; |
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|
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template<typename _CharT, typename _Traits> |
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inline bool |
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operator==(const istreambuf_iterator<_CharT, _Traits>& __a, |
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const istreambuf_iterator<_CharT, _Traits>& __b) |
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{ return __a.equal(__b); } |
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|
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template<typename _CharT, typename _Traits> |
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inline bool |
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operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, |
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const istreambuf_iterator<_CharT, _Traits>& __b) |
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{ return !__a.equal(__b); } |
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|
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/// Provides output iterator semantics for streambufs. |
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template<typename _CharT, typename _Traits> |
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class ostreambuf_iterator |
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: public iterator<output_iterator_tag, void, void, void, void> |
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{ |
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public: |
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// Types: |
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///@{ |
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/// Public typedefs |
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#if __cplusplus > 201703L |
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using difference_type = ptrdiff_t; |
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#endif |
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typedef _CharT char_type; |
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typedef _Traits traits_type; |
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typedef basic_streambuf<_CharT, _Traits> streambuf_type; |
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typedef basic_ostream<_CharT, _Traits> ostream_type; |
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///@} |
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|
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template<typename _CharT2> |
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friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
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ostreambuf_iterator<_CharT2> >::__type |
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copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
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ostreambuf_iterator<_CharT2>); |
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|
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private: |
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streambuf_type* _M_sbuf; |
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bool _M_failed; |
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|
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public: |
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|
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#if __cplusplus > 201703L |
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constexpr |
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ostreambuf_iterator() noexcept |
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: _M_sbuf(nullptr), _M_failed(true) { } |
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#endif |
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|
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/// Construct output iterator from ostream. |
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ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT |
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: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } |
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|
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/// Construct output iterator from streambuf. |
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ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT |
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: _M_sbuf(__s), _M_failed(!_M_sbuf) { } |
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|
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/// Write character to streambuf. Calls streambuf.sputc(). |
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ostreambuf_iterator& |
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operator=(_CharT __c) |
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{ |
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if (!_M_failed && |
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_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) |
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_M_failed = true; |
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return *this; |
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} |
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|
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/// Return *this. |
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ostreambuf_iterator& |
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operator*() |
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{ return *this; } |
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|
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/// Return *this. |
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ostreambuf_iterator& |
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operator++(int) |
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{ return *this; } |
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|
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/// Return *this. |
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ostreambuf_iterator& |
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operator++() |
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{ return *this; } |
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|
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/// Return true if previous operator=() failed. |
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bool |
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failed() const _GLIBCXX_USE_NOEXCEPT |
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{ return _M_failed; } |
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|
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ostreambuf_iterator& |
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_M_put(const _CharT* __ws, streamsize __len) |
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{ |
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if (__builtin_expect(!_M_failed, true) |
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&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len, |
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false)) |
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_M_failed = true; |
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return *this; |
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} |
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}; |
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|
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// Overloads for streambuf iterators. |
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template<typename _CharT> |
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
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ostreambuf_iterator<_CharT> >::__type |
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copy(istreambuf_iterator<_CharT> __first, |
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istreambuf_iterator<_CharT> __last, |
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ostreambuf_iterator<_CharT> __result) |
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{ |
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if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed) |
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{ |
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bool __ineof; |
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__copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof); |
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if (!__ineof) |
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__result._M_failed = true; |
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} |
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return __result; |
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} |
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|
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template<bool _IsMove, typename _CharT> |
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
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ostreambuf_iterator<_CharT> >::__type |
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__copy_move_a2(_CharT* __first, _CharT* __last, |
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ostreambuf_iterator<_CharT> __result) |
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{ |
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const streamsize __num = __last - __first; |
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if (__num > 0) |
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__result._M_put(__first, __num); |
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return __result; |
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} |
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|
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template<bool _IsMove, typename _CharT> |
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
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ostreambuf_iterator<_CharT> >::__type |
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__copy_move_a2(const _CharT* __first, const _CharT* __last, |
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ostreambuf_iterator<_CharT> __result) |
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{ |
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const streamsize __num = __last - __first; |
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if (__num > 0) |
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__result._M_put(__first, __num); |
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return __result; |
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} |
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|
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template<bool _IsMove, typename _CharT> |
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
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_CharT*>::__type |
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__copy_move_a2(istreambuf_iterator<_CharT> __first, |
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istreambuf_iterator<_CharT> __last, _CharT* __result) |
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{ |
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typedef istreambuf_iterator<_CharT> __is_iterator_type; |
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typedef typename __is_iterator_type::traits_type traits_type; |
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typedef typename __is_iterator_type::streambuf_type streambuf_type; |
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typedef typename traits_type::int_type int_type; |
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|
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if (__first._M_sbuf && !__last._M_sbuf) |
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{ |
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streambuf_type* __sb = __first._M_sbuf; |
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int_type __c = __sb->sgetc(); |
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while (!traits_type::eq_int_type(__c, traits_type::eof())) |
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{ |
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const streamsize __n = __sb->egptr() - __sb->gptr(); |
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if (__n > 1) |
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{ |
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traits_type::copy(__result, __sb->gptr(), __n); |
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__sb->__safe_gbump(__n); |
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__result += __n; |
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__c = __sb->underflow(); |
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} |
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else |
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{ |
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*__result++ = traits_type::to_char_type(__c); |
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__c = __sb->snextc(); |
| 392 |
} |
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} |
| 394 |
} |
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return __result; |
| 396 |
} |
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|
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template<typename _CharT, typename _Size> |
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
| 400 |
_CharT*>::__type |
| 401 |
__copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result, |
| 402 |
bool __strict __attribute__((__unused__))) |
| 403 |
{ |
| 404 |
if (__n == 0) |
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return __result; |
| 406 |
|
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__glibcxx_requires_cond(__it._M_sbuf, |
| 408 |
_M_message(__gnu_debug::__msg_inc_istreambuf) |
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._M_iterator(__it)); |
| 410 |
_CharT* __beg = __result; |
| 411 |
__result += __it._M_sbuf->sgetn(__beg, __n); |
| 412 |
__glibcxx_requires_cond(!__strict || __result - __beg == __n, |
| 413 |
_M_message(__gnu_debug::__msg_inc_istreambuf) |
| 414 |
._M_iterator(__it)); |
| 415 |
return __result; |
| 416 |
} |
| 417 |
|
| 418 |
template<typename _CharT> |
| 419 |
typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
| 420 |
istreambuf_iterator<_CharT> >::__type |
| 421 |
find(istreambuf_iterator<_CharT> __first, |
| 422 |
istreambuf_iterator<_CharT> __last, const _CharT& __val) |
| 423 |
{ |
| 424 |
typedef istreambuf_iterator<_CharT> __is_iterator_type; |
| 425 |
typedef typename __is_iterator_type::traits_type traits_type; |
| 426 |
typedef typename __is_iterator_type::streambuf_type streambuf_type; |
| 427 |
typedef typename traits_type::int_type int_type; |
| 428 |
const int_type __eof = traits_type::eof(); |
| 429 |
|
| 430 |
if (__first._M_sbuf && !__last._M_sbuf) |
| 431 |
{ |
| 432 |
const int_type __ival = traits_type::to_int_type(__val); |
| 433 |
streambuf_type* __sb = __first._M_sbuf; |
| 434 |
int_type __c = __sb->sgetc(); |
| 435 |
while (!traits_type::eq_int_type(__c, __eof) |
| 436 |
&& !traits_type::eq_int_type(__c, __ival)) |
| 437 |
{ |
| 438 |
streamsize __n = __sb->egptr() - __sb->gptr(); |
| 439 |
if (__n > 1) |
| 440 |
{ |
| 441 |
const _CharT* __p = traits_type::find(__sb->gptr(), |
| 442 |
__n, __val); |
| 443 |
if (__p) |
| 444 |
__n = __p - __sb->gptr(); |
| 445 |
__sb->__safe_gbump(__n); |
| 446 |
__c = __sb->sgetc(); |
| 447 |
} |
| 448 |
else |
| 449 |
__c = __sb->snextc(); |
| 450 |
} |
| 451 |
|
| 452 |
__first._M_c = __eof; |
| 453 |
} |
| 454 |
|
| 455 |
return __first; |
| 456 |
} |
| 457 |
|
| 458 |
template<typename _CharT, typename _Distance> |
| 459 |
typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
| 460 |
void>::__type |
| 461 |
advance(istreambuf_iterator<_CharT>& __i, _Distance __n) |
| 462 |
{ |
| 463 |
if (__n == 0) |
| 464 |
return; |
| 465 |
|
| 466 |
__glibcxx_assert(__n > 0); |
| 467 |
__glibcxx_requires_cond(!__i._M_at_eof(), |
| 468 |
_M_message(__gnu_debug::__msg_inc_istreambuf) |
| 469 |
._M_iterator(__i)); |
| 470 |
|
| 471 |
typedef istreambuf_iterator<_CharT> __is_iterator_type; |
| 472 |
typedef typename __is_iterator_type::traits_type traits_type; |
| 473 |
typedef typename __is_iterator_type::streambuf_type streambuf_type; |
| 474 |
typedef typename traits_type::int_type int_type; |
| 475 |
const int_type __eof = traits_type::eof(); |
| 476 |
|
| 477 |
streambuf_type* __sb = __i._M_sbuf; |
| 478 |
while (__n > 0) |
| 479 |
{ |
| 480 |
streamsize __size = __sb->egptr() - __sb->gptr(); |
| 481 |
if (__size > __n) |
| 482 |
{ |
| 483 |
__sb->__safe_gbump(__n); |
| 484 |
break; |
| 485 |
} |
| 486 |
|
| 487 |
__sb->__safe_gbump(__size); |
| 488 |
__n -= __size; |
| 489 |
if (traits_type::eq_int_type(__sb->underflow(), __eof)) |
| 490 |
{ |
| 491 |
__glibcxx_requires_cond(__n == 0, |
| 492 |
_M_message(__gnu_debug::__msg_inc_istreambuf) |
| 493 |
._M_iterator(__i)); |
| 494 |
break; |
| 495 |
} |
| 496 |
} |
| 497 |
|
| 498 |
__i._M_c = __eof; |
| 499 |
} |
| 500 |
|
| 501 |
/// @} group iterators |
| 502 |
|
| 503 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 504 |
} // namespace |
| 505 |
|
| 506 |
#endif |
