Question

I have made a map of functions. all these functions are void and receive single string parameter.

code:

void f1(string params){...}
void f2(string params){...}
void f3(string params){...}

map<string , void*> funcMap;

funcMap["f1"] =(void*)&f1;
funcMap["f2"] =(void*)&f2;
funcMap["f3"] =(void*)&f3;

how do i call a function?
I tried the next code, but id doesn’t work:

void (*func)(string) =  &funcMap[commandType];
func(commandParam);

I get this error message:

Server.cpp:160:46: error: cannot convert ‘void**’ to ‘void (*)(std::string) {aka void (*)(std::basic_string<char>)}’ in initialization

Answer 1

using pfunc = void (*)(string);

map<string, pfunc> funcMap; 
funcMap["f1"] = f1; //and so forth

And then call:

pfunc f = funcMap[commandType];
(*f)(commandParam);   

In general, why throw away type safety? If it’s a map of function pointers, declare it to be one.