编译时动态函数调用

Question

Not sure the title highlights my goal.

Can I dynamically call a method at compile time ? For example:

int CallMethod(string methodName, string methodArg)
{
    Foo foo;
    return foo.#methodName(methodArg);
}

CallMethod("getValue", "test"); // This would attempt to call on a Foo instance, method getValue with argument "test" -- foo.getValue("test");

Thanks!

Answer 1

This is Reflection and is not available natively in C++

If you have a limited number of possible values for methodName you could build a Lookup table which calls the appropriate function based on methodName but you cannot call arbitrary functions with this system.

This could either be a std::map as @PaperBirdMaster suggests or a giant set of if-else checks. But this is not true Reflection, just a crude illusion of the same.

Answer 2

You could create a Macro:

#define CallMethod(methodName, var) { Foo foo; foo.##methodName(var); }

in main function:

CallMethod(foo,"test");