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std::basic_streambuf::sputn

性病:基本[医]Streambuf::span,std::basic[医]流光::xspunn

std::streamsize sputn( const char_type* s, std::streamsize count (1)
protected: virtual std::streamsize xsputn( const char_type* s, std::streamsize count (2)

1%29次电话xsputn(s, count)最派生的类。

2%29写count指向其第一个元素的字符数组的输出序列的字符。s.这些字符的书写方式就好像是通过反复调用sputc().写作在任何一种情况下都会停止count字符被写入或调用sputc()会回来的Traits::eof()...

如果放置区域变成满的%28pptr() == epptr()%29,此函数可调用overflow(),或达到调用的效果。overflow()其他的,没有具体说明的,意思是。

参数

%280%29

返回值

成功写入的字符数。

二次

#include <iostream> #include <sstream> int main() { std::ostringstream s1; std::streamsize sz = s1.rdbuf()->sputn("This is a test", 14 s1 << '\n'; std::cout << "The call to sputn() returned " << sz << '\n' << "The output sequence contains " << s1.str( std::istringstream s2; sz = s2.rdbuf()->sputn("This is a test", 14 std::cout << "The call to sputn() on an input stream returned " << sz << '\n'; }

二次

产出:

二次

The call to sputn() returned 14 The output sequence contains This is a test The call to sputn() on an input stream returned 0

二次

另见

sgetninvokes xsgetn() (public member function)

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