Expression cannot be used as a function, c++ machine code function

Question

I'm generating machine code for buffer overflow execution and wanted a quick and easy method to plug the bytecode into a program and see how it runs on my host machine.

I looked for ways to dynamically generate functions in C++ and came across this question with this very interesting answer. It has been upvoted quite a bit and there doesn't seem to be anyone challenging what they said.

However, when trying to implement what they wrote in my own program I get the error "Expression cannot be used as a function".

Here's my code:

int main()
{
    uint8_t machinecode[] = {0x90, 0x0F, 0x01};

    *reinterpret_cast<void**>(&machinecode)();

    return 0;
}

Answer 1

As far as code validity for compilation goes, in the hope that I understand you question correctly, you need to cast to a callable, which in this case is void(*)(), not simply void*, and you need an extra set of parentheses:

(*reinterpret_cast<void(*)()>(bytecode))();

See here live, but I'm not sure this is anything you actually want to run, even in the context you have provided.