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  • RVO vs. TCO

    From Marcel Mueller@21:1/5 to All on Mon Jun 9 17:16:12 2025
    Hello,

    does a tail call prevent return value optimization?


    vector<XXX> func1();

    vector<XXX> func2()
    {
    if (some_condition)
    return func1();

    vector<XXX> result;
    // populate result

    return result;
    }

    AFAIK RVO requires all paths of a function to return the same instance.
    But can this also work with tail calls like func1()?

    If not, the following work around could be preferred:

    vector<XXX> func3()
    {
    vector<XXX> result;

    if (some_condition)
    result = func1(); // forces move
    else
    ; // populate result

    return result;
    }


    Marcel

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