Thread: sprintf with dynamic string

  1. #16
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Quote Originally Posted by Ducky
    Now if i have to reassign the c++ String to a C-string i came back where i started and
    i just might as well start out with a C string.

    Because the whole point of C++ strings was to not allocate and free memory.
    You could use the &str[0] trick to get a pointer, though that will only be properly well defined in the next version of C++. Alternatively, you could copy the std::string to a std::vector<char>, and then use the &x[0] trick to get a pointer (which you assign to the pointer that should be modified).
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  2. #17
    Registered User
    Join Date
    Dec 2007
    There you go with the solution!

    I hope this trick doesnt have any undefined behaviour, seeing that its not yet properly defined.

    Thank you Laserlight!
    Compiler MSVC++ 2013 with Code::Blocks.

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