std::basic_istream::basic_istream
explicit basic_istream( std::basic_streambuf<CharT, Traits>* sb); | (1) | ? |
|---|---|---|
protected: basic_istream( const basic_istream& rhs ) = delete; | (2) | (since C++11) |
protected: basic_istream( basic_istream&& rhs ); | (3) | (since C++11) |
1%29构造basic_istream对象，通过调用basic_ios::init(sb).的价值gcount()初始化为零。
2%29复制构造函数受到保护，并被删除。输入流不可复制。
3%29移动构造函数复制gcount()从rhs，将rhs的gcount%28%29值设置为零，并使用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：它由可移动输入流类的移动构造函数调用。std::basic_ifstream和std::basic_istringstream，它们知道如何正确移动关联的流缓冲区。
参数
sb | - | streambuffer to use as underlying device |
|---|
例
二次
#include <sstream>
#include <iostream>
int main()
{
std::istringstream s1("hello");
std::istream s2(s1.rdbuf()); // OK: s2 shares the buffer with s1
// std::istream s3(std::istringstream("test")); // ERROR: move constructor is protected
// std::istream s4(s2); // ERROR: copy constructor is deleted
std::istringstream s5(std::istringstream("world")); // OK: move ctor called by derived class
std::cout << s2.rdbuf() << ' ' << s5.rdbuf() << '\n';
}二次
产出：
二次
hello world二次
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