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c++variablesgoto

C++ Goto variable

Is there a way to call a goto statement using a variable in the place of a label name?

I'm looking for something similar to this (this doesn't work for me):

// std::string or some other type that could represent a label
void callVariable(std::string name){
    goto name;
}

int main(){
    first:
    std::cout << "Hi";
    callVariable(first);

    return 0;
}

I am not actually using this, I am more interested in learning.

Solution

  • Yes and no. There's no such standard language feature, but it is a compiler extension in at least GCC:

    int main() {
    void* label;

    first:
    std::cout << "Hi";
    label = &&first;
    goto *label;
}

    That said, I'd have to think hard for a use case where this is better than any standard alternatives.