std::basic_ostream::basic_ostream
explicit basic_ostream( std::basic_streambuf<CharT, Traits>* sb ); | (1) | ? |
|---|---|---|
protected: basic_ostream( const basic_ostream& rhs ) = delete; | (2) | (since C++11) |
protected: basic_ostream( basic_ostream&& rhs ); | (3) | (since C++11) |
1%29构造basic_ostream对象，通过调用basic_ios::init(sb)...
2%29复制构造函数受到保护，并被删除。输出流不可复制。
3%29移动构造函数使用basic_ios<CharT, Traits>::move(rhs)移动所有基本的[医]IOS成员，除rdbuf()，来自rhs进*this这个移动构造函数是受保护的：它由可移动输出流类的移动构造函数调用。std::basic_ofstream和std::basic_ostringstream，它们知道如何正确移动关联的流缓冲区。
参数
sb | - | streambuffer to use as output sequence |
|---|---|---|
rhs | - | basic_ostream to initialize from |
例
二次
#include <sstream>
#include <utility>
#include <iostream>
int main()
{
// ERROR: copy ctor is deleted
// std::ostream myout(std::cout);
// OK: shares buffer with cout
std::ostream myout(std::cout.rdbuf());
// ERROR: move constructor is protected
// std::ostream s2(std::move(std::ostringstream() << 7.1));
// OK: move ctor called through the derived class
std::ostringstream s2(std::move(std::ostringstream() << 7.1));
myout << s2.str() << '\n';
}二次
产出：
二次
7.1二次
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