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

问题:

I have 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>&).

回答1:

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

Depending on your usage, the following works quite well:

#include  #include   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

回答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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