b101f01382
``` Benchmark old new Difference % Difference ---------------------------------------------- -------------- -------------- ------------ -------------- std::copy(CharT*,_CharT*,_ostreambuf_iterator) 8115.45 329.54 -7785.91 -95.94% ```
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
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#define _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
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#include <__algorithm/specialized_algorithms.h>
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#include <__config>
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#include <__cstddef/ptrdiff_t.h>
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#include <__fwd/ios.h>
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#include <__fwd/ostream.h>
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#include <__fwd/streambuf.h>
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#include <__iterator/iterator.h>
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#include <__iterator/iterator_traits.h>
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#include <__type_traits/is_same.h>
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#include <__utility/pair.h>
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#include <iosfwd> // for forward declaration of ostreambuf_iterator
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _CharT, class _Traits>
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class ostreambuf_iterator
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: public __iterator_base<ostreambuf_iterator<_CharT, _Traits>, output_iterator_tag, void, void, void, void> {
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public:
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typedef output_iterator_tag iterator_category;
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typedef void value_type;
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#if _LIBCPP_STD_VER >= 20
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typedef ptrdiff_t difference_type;
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#else
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typedef void difference_type;
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#endif
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typedef void pointer;
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typedef void reference;
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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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private:
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streambuf_type* __sbuf_;
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public:
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_LIBCPP_HIDE_FROM_ABI ostreambuf_iterator(ostream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {}
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_LIBCPP_HIDE_FROM_ABI ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {}
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_LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator=(_CharT __c) {
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if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
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__sbuf_ = nullptr;
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return *this;
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}
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_LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator*() { return *this; }
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_LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator++() { return *this; }
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_LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator++(int) { return *this; }
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_LIBCPP_HIDE_FROM_ABI bool failed() const _NOEXCEPT { return __sbuf_ == nullptr; }
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#if _LIBCPP_HAS_LOCALIZATION
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template <class _Ch, class _Tr>
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friend _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator<_Ch, _Tr> __pad_and_output(
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ostreambuf_iterator<_Ch, _Tr> __s, const _Ch* __ob, const _Ch* __op, const _Ch* __oe, ios_base& __iob, _Ch __fl);
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#endif // _LIBCPP_HAS_LOCALIZATION
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template <class, class...>
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friend struct __specialized_algorithm;
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};
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template <class _InCharT, class _CharT, class _Traits>
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struct __specialized_algorithm<_Algorithm::__copy,
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__iterator_pair<_InCharT*, _InCharT*>,
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__single_iterator<ostreambuf_iterator<_CharT, _Traits> > > {
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static const bool __has_algorithm = is_same<const _CharT, const _InCharT>::value;
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_LIBCPP_HIDE_FROM_ABI static pair<_InCharT*, ostreambuf_iterator<_CharT, _Traits> >
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operator()(_InCharT* __first, _InCharT* __last, ostreambuf_iterator<_CharT, _Traits> __result) {
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auto __size = __last - __first;
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if (__result.__sbuf_ && __size > 0) {
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if (__result.__sbuf_->sputn(__first, __last - __first) != __size)
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__result.__sbuf_ = nullptr;
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}
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return pair<_InCharT*, ostreambuf_iterator<_CharT, _Traits> >(__last, __result);
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}
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};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
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