std::basic_ios::rdbuf
std::basic_streambuf<CharT, Traits>* rdbuf() const; | (1) | ? |
|---|---|---|
std::basic_streambuf<CharT, Traits>* rdbuf( std::basic_streambuf<CharT, Traits>* sb ); | (2) | ? |
管理关联的流缓冲区。
1%29返回关联的流缓冲区。如果没有关联的流缓冲区，则返回NULL...
2%29将关联的流缓冲区设置为sb.错误状态通过调用clear()返回操作前的关联流缓冲区。如果没有关联的流缓冲区，则返回NULL...
参数
sb | - | stream buffer to associate to |
|---|
返回值
关联的流缓冲区，或NULL如果没有关联的流缓冲区。
例外
%280%29
例
二次
#include <iostream>
#include <sstream>
int main()
{
std::ostringstream local;
auto cout_buff = std::cout.rdbuf(); // save pointer to std::cout buffer
std::cout.rdbuf(local.rdbuf()); // substitute internal std::cout buffer with
// buffer of 'local' object
// now std::cout work with 'local' buffer
// you don't see this message
std::cout << "some message";
// go back to old buffer
std::cout.rdbuf(cout_buff);
// you will see this message
std::cout << "back to default buffer\n";
// print 'local' content
std::cout << "local content: " << local.str() << "\n";
}二次
产出：
二次
back to default buffer
local content: some message二次
另见
set_rdbuf | replaces the rdbuf without clearing its error state (protected member function) |
|---|
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