std::basic_filebuf::swap
void swap( std::basic_filebuf& rhs ); | ? | (since C++11) |
|---|
交换状态和内容*this和rhs...
参数
rhs | - | another basic_filebuf |
|---|
返回值
%280%29
注记
此函数在交换时自动调用。std::fstream对象时，很少有必要直接调用它。
例
二次
#include <fstream>
#include <string>
#include <iostream>
int main()
{
std::ifstream fin("test.in"); // read-only
std::ofstream fout("test.out"); // write-only
std::string s;
getline(fin, s);
std::cout << s << '\n'; // outputs the first line of test.in
fin.rdbuf()->swap(*fout.rdbuf()); //swap the underlying buffers
getline(fin, s); // fails: cannot read from a write-only filebuf
std::cout << s << '\n'; // prints empty line
}二次
另见
operator= (C++11) | assigns a basic_filebuf object (public member function) |
|---|---|
std::swap(std::basic_filebuf) (C++11) | specializes the std::swap algorithm (function template) |
swap (C++11) | swaps two file streams (public member function of std::basic_fstream) |
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