如何复制从一个stringstream对象到另一个在C + +？ [英] how copy from one stringstream object to another in C++?

问题描述

我有stringstream对象ss1

I have stringstream object ss1

现在我想从这个创建另一个副本。

now I would like to create another copy from this one.

我试试这个

std::stringstream ss2 = ss1;

或

std::stringstream ss2(ss1)

无效

错误消息如下

std :: ios :: basic_ios（const std :: ios&）不能从bsl :: basic_stringstream，bsl :: allocator> :: basic_stringstream（const bsl :: basic_stringstream，bsl :: allocator>&）。

std::ios::basic_ios(const std::ios &) is not accessible from bsl::basic_stringstream, bsl::allocator>::basic_stringstream(const bsl::basic_stringstream, bsl::allocator>&).

推荐答案

确实，流是不可复制的（虽然它们是可移动的）。

Indeed, streams are non-copyable (though they are movable).

根据您的用法，以下工作很好：

Depending on your usage, the following works quite well:

#include <iostream>
#include <sstream>

int main()
{
    std::stringstream ss1;
    ss1 << "some " << 123 << " stuff" << std::flush;

    std::stringstream ss2;
    ss2 << ss1.rdbuf(); // copy everything inside ss1's buffer to ss2's buffer

    std::cout << ss1.str() << std::endl;
    std::cout << ss2.str() << std::endl;
}

输出：

一些123个素材

一些123个素材

some 123 stuff
some 123 stuff

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