std::ostreambuf_iterator
STD：：OStreambuf[医]迭代器
| Defined in header | | |
|---|---|---|
| template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void> | | (until C++17) |
| template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator; | | (since C++17) |
std::ostreambuf_iterator是一次过OutputIterator将连续字符写入std::basic_streambuf对象，它是为其构造的。当迭代器%28(不管是否取消引用)分配给%29时，将执行实际的写操作。递增std::ostreambuf_iterator是个禁止行动。
在典型的实现中，std::ostreambuf_iterator是指向关联std::basic_streambuf和一个布尔标志，指示是否达到了文件结束条件。
成员类型
| Member type | Definition |
|---|---|
| char_type | CharT |
| traits_type | Traits |
| streambuf_type | std::basic_streambuf<CharT, Traits> |
| ostream_type | std::basic_ostream<CharT, Traits> |
成员函数
| (constructor) | constructs a new ostreambuf_iterator (public member function) |
|---|---|
| (destructor) (implicitly declared) | destructs an ostreambuf_iterator (public member function) |
| operator= | writes a character to the associated output sequence (public member function) |
| operator* | no-op (public member function) |
| operator++operator++(int) | no-op (public member function) |
| failed | tests if output failed (public member function) |
成员类型
| Member type | Definition |
|---|---|
| value_type | void |
| difference_type | void |
| pointer | void |
| reference | void |
| iterator_category | std::output_iterator_tag |
注意：在C++17之前，这些成员类型必须通过从std::iterator<std::output_iterator_tag,void,void,void,void>...
例
二次
#include <string>
#include <algorithm>
#include <iterator>
#include <iostream>
int main()
{
std::string s = "This is an example\n";
std::copy(s.begin(), s.end(), std::ostreambuf_iterator<char>(std::cout)
}
二次
产出：
二次
This is an example
二次
另见
| istreambuf_iterator | input iterator that reads from std::basic_streambuf (class template) |
|---|---|
| ostream_iterator | output iterator that writes to std::basic_ostream (class template) |
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