How to call a class member function via function pointer in map [C++]

[Shaitan00]

I'm trying to declare a std::map that is keyed by a char and has a function pointer as a second parameter, these functions would be a member function of my class. But for some odd reason I cannot call the functions when extracted...

So, I have a class A as shown below, it contains a map as well as a function

class A
{
private:
	map<char, void (A::*)(void)> mapA;
public:
	void func();

Next I have main code that looks like this:

A::A()	// constructor
{
	// Generate User Options
	mapA['a'] = &A::func;
}

Now, I try to execute func by extracting it from the map and running the function:

	map<char, void (A::*)(void)>::iterator it;
	for ( it=mapA.begin() ; it != mapA.end(); it++ )
	{
		(*it).second();
	}

I would assume this would launch function "func" as it is stored in the map, but instead it generates the following error message:
error C2064: term does not evaluate to a function taking 0 arguments

Any help would be greatly appreciated...
Thanks,

[Lindley]

Any non-static class method takes an implicit "this" pointer representing the object upon which it operates. Thus it will not precisely match the expected function signature.

I would suggest changing your map's value type to be a functor object which calls the desired method of the specified object upon invocation of its operator(). Functors are generally easier to deal with than raw function pointers in C++.

[Shaitan00]

I'm not 100% sure I understand what you mean ... functor object to call the desired method?
Can you provide an example?

[zerocool2k]

You can view an example of function pointer from my post here:
http://www.codeguru.com/forum/showth...=479143&page=3