std::ostreambuf_iterator

 

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indirectly_readable (C++20) indirectly_writable (C++20) weakly_incrementable (C++20) incrementable (C++20) is-integer-like is-signed-integer-like (C++20)(C++20)	sentinel_for (C++20) sized_sentinel_for (C++20) input_iterator (C++20) output_iterator (C++20) input_or_output_iterator (C++20)	forward_iterator (C++20) bidirectional_iterator (C++20) random_access_iterator (C++20) contiguous_iterator (C++20)
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input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag (C++20)	iter_value_titer_difference_titer_reference_titer_const_reference_titer_rvalue_reference_titer_common_reference_t (C++20)(C++20)(C++20)(C++23)(C++20)(C++20)	iterator (C++17 弃用) iterator_traits incrementable_traits (C++20) indirectly_readable_traits (C++20)
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indirectly_unary_invocableindirectly_regular_unary_invocable (C++20)(C++20)	indirect_unary_predicate (C++20) indirect_binary_predicate (C++20)	indirect_equivalence_relation (C++20) indirect_strict_weak_order (C++20)
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indirectly_movable (C++20) indirectly_movable_storable (C++20) indirectly_copyable (C++20)	indirectly_copyable_storable (C++20)   indirectly_swappable (C++20) indirectly_comparable (C++20)	permutable (C++20) mergeable (C++20) sortable (C++20)
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流迭代器 istream_iterator    ostream_iterator istreambuf_iterator ostreambuf_iterator	迭代器定制点 ranges::iter_move (C++20) ranges::iter_swap (C++20)
迭代器操作 advance distance prev (C++11)   next (C++11) ranges::advance (C++20) ranges::distance (C++20) ranges::prev (C++20) ranges::next (C++20)	范围访问 begincbegin (C++11)(C++14) rbegincrbegin (C++14)(C++14)   endcend (C++11)(C++14) rendcrend (C++14)(C++14)   sizessize (C++17)(C++20) empty (C++17) data (C++17)

 

std::ostreambuf_iterator

成员函数

ostreambuf_iterator::ostreambuf_iterator

ostreambuf_iterator::operator=

ostreambuf_iterator::operator*

ostreambuf_iterator::operator++ostreambuf_iterator::operator++(int)

ostreambuf_iterator::failed

 

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在标头 <iterator> 定义
template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void>		(C++17 前)
template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator;		(C++17 起)

See More

std::ostreambuf_iterator 是单趟输出迭代器，写入相继元素到为之创建迭代器的 std::basic_streambuf 对象。实际写操作在赋值给迭代器（无论是否解引用）时进行。自增 std::ostreambuf_iterator 是无操作。

典型实现中，std::ostreambuf_iterator 仅有的数据成员是指向关联 std::basic_streambuf 的指针，和指示是否抵达文件尾条件的布尔标志。

成员类型

成员类型	定义
iterator_category	std::output_iterator_tag
value_type	void
difference_type	void (C++20 前) std::ptrdiff_t (C++20 起)
pointer	void
reference	void
char_type	CharT
traits_type	Traits
streambuf_type	std::basic_streambuf<CharT, Traits>
ostream_type	std::basic_ostream<CharT, Traits>

要求通过从 std::iterator<std::output_iterator_tag, void, void, void, void> 继承获得成员类型 iterator_category、value_type、difference_type、pointer 和 reference。

(C++17 前)

成员函数

(构造函数)	构造新的 ostreambuf_iterator (公开成员函数)
(析构函数) (隐式声明)	销毁 ostreambuf_iterator (公开成员函数)
operator=	写字符到关联的输出序列 (公开成员函数)
operator*	无操作 (公开成员函数)
operator++operator++(int)	无操作 (公开成员函数)
failed	测试是否输出失败 (公开成员函数)

示例

运行此代码

#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>

int main()
{
    std::string s = "This is an example\n";
    std::copy(s.begin(), s.end(), std::ostreambuf_iterator<char>(std::cout));
}

输出：

This is an example

参阅

istreambuf_iterator	从 std::basic_streambuf 读取的输入迭代器 (类模板)
ostream_iterator	写入 std::basic_ostream 的输出迭代器 (类模板)