How to use the string as a function as function call?

Question

Hi I have a string which i will be getting from the input from a user. But i should take the input what user gives and obviously that is the name of a function in my code. So i should call the function which the user has entered. How can i do this? Example: Suppose the user has entered a name interpolation in the textbox in the form and then he presses enter. Then i should read the name as follws: String ^ function_call = textbox->Text; and after this operation i should call the function interpolation which user has entered. int index = interpolation();//this is what i need this function will return a integer.

Vulpes · Answer

OK here's an example of how you can call a global function using reflection: #include stdafx.h using namespace System; using namespace System::Reflection; int interpolation() { return 42; } int main(array ^args) { String^ functionName = interpolation; Module^ module = Assembly::GetExecutingAssembly()->GetModules(false)[0]; BindingFlags bf = BindingFlags::Static | BindingFlags::NonPublic; CallingConventions cc = CallingConventions::Standard; array ^ types = {}; MethodInfo^ mi = module->GetMethod(functionName bf nullptr cc types nullptr); if (mi == nullptr) { Console::WriteLine(A global function called '{0}' does not exist functionName); } else { Object^ result = mi->Invoke(nullptr nullptr); int index = *reinterpret_cast (result); Console::WriteLine(index is {0} index); } Console::ReadKey(); return 0; }

Karthik Agarwal · Answer

The function is global function. I don't wanna do it in if else ladder and i want to do it probably in some other way.

Vulpes · Answer

Well the only way to make such calls 'early bound' is to use an if/else if/else ladder: if (function_call == interpolation) { int index = interpolation(); // do something with index } else if () // etc Otherwise you'd need to use reflection to make 'late bound' calls. Is the function you're calling an instance or static method of some class or struct or is it a global function of the current assembly?