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Home/ Questions/Q 7080715
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T06:49:45+00:00 2026-05-28T06:49:45+00:00

In my C++ project I’m trying to do this: std::ostringstream stream(std::ostringstream::out); But I’m getting

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In my C++ project I’m trying to do this:

 std::ostringstream stream(std::ostringstream::out);

But I’m getting an error:

error C2027: use of undefined type 'std::basic_ostringstream<_Elem,_Traits,_Alloc>'

I’m already including iostream and ostream libraries so I’m not sure why it’s treating ostringstream as undefined…

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  1. Editorial Team
    Editorial Team
    2026-05-28T06:49:46+00:00Added an answer on May 28, 2026 at 6:49 am

    std::ostringstream is defined in <sstream>. <iostream> only contains a forward declaration and <ostream> does not help at all.

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