how copy from one stringstream object to another in C++?

22,920

Solution 1

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

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;
}

Output:

some 123 stuff
some 123 stuff

Solution 2

As std::stringstream does not provide a copy constructor, you have to build it from the std::string ss1outputs:

std::stringstream ss2(ss1.str());
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skydoor
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skydoor

Updated on July 05, 2021

Comments

  • skydoor
    skydoor over 2 years

    I have std::stringstream object ss1. Now, I would like to create another copy from this one.

    I try this:

    std::stringstream ss2 = ss1;
    

    or:

    std::stringstream ss2(ss1)
    

    neither works

    The error message is like this:

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