Problem with ostream

Hello everybody!
I have a problem during working on my program. I have std::ostream& oStr and I want to calculate its size, but I can't. In google I have found a method:

    oStr.seekp(0, std::ios::end);
    int sizeOfFile = (int)oStr.tellp();

But it returns -1. Please help me find out size of the std::ostream& oStr
Last edited on
Is the stream oStr open?
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