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std::basic_ostream::swap

性病：基本[医]Ostream：：SWAP

protected: void swap(basic_ostream& rhs​(since C++11)

打电话basic_ios::swap(rhs)若要交换基类的所有数据成员，除rdbuf()之间*this和rhs这个交换函数是受保护的：它由可交换输出流类的交换函数调用。std::basic_ofstream和std::basic_ostringstream，它们知道如何正确地交换相关的流缓冲区。

参数

rhs-a basic_ostream of the same type to swap with

例

二次

#include <sstream>
#include <iostream>
#include <utility>
int main()
{
    std::ostringstream s1("hello"
    std::ostringstream s2("bye"
 
    s1.swap(s2 // OK, ostringstream has a public swap()
    std::swap(s1, s2 // OK, calls s1.swap(s2)
 
//  std::cout.swap(s2 // ERROR: swap is a protected member
 
    std::cout << s1.str() << '\n';
}

二次

产出：

二次

hello

二次

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