std::basic_istream::basic_istream
来自cppreference.com
< cpp | io | basic istream
 |
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| explicit basic_istream( std::basic_streambuf<CharT,Traits>* sb); |
(1) | |
| protected: basic_istream( const basic_istream& rhs ) = delete; |
(2) | |
| protected: basic_istream( basic_istream&& rhs ); |
(3) | （C++11 起） |
，分配初始值
2) basic_istream通过调用基类的构造basic_ios::init(sb)对象。被初始化为零的值gcount().原文：
Constructs the
basic_istream object, assigning initial values to the base class by calling basic_ios::init(sb). The value of gcount() is initialized to zero.拷贝构造函数是受保护的，将被删除。输入流是不可复制的.
3) 原文：
The copy constructor is protected, and is deleted. Input streams are not copyable.
此举构造函数的值复制
gcount()从rhs的gcount的（），设定值的右边为零，并使用basic_ios<charT, traits>::move(rhs)，将所有basic_ios的成员，除为rdbuf()，从rhs到*this。这一举动的构造函数是受保护的，它被称为可移动的输入流类的构造函数的移动std::basic_ifstream和std::basic_istringstream，哪知道如何正确地移动相关的streambuffer的.原文：
The move constructor copies the value of
gcount() from rhs, sets the gcount() value of rhs to zero, and uses basic_ios<charT, traits>::move(rhs) to move all basic_ios members, except for the rdbuf(), from rhs into *this. This move constructor is protected: it is called by the move constructors of movable input stream classes std::basic_ifstream and std::basic_istringstream, which know how to correctly move the associated streambuffer.[编辑] 参数
| sb | - | streambuffer使用的基础设备
原文： streambuffer to use as underlying device |
[编辑] 示例
#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'; }
输出：
hello world
