Thread: Looking to give script-like interface to program. (or something)

current is a pointer to an object and therefore you'll need to dereference it properly to call the operator().

Code:

                  << (*current)(val)

Apparently brackets make a difference here: 1) dereference current (and current only), 2) call operator() on the dereferenced object.

In addition the base-class needs to declare a virtual float operator()(int), otherwise you'll be trying to call a method through a base pointer that the base class doesn't have.

Actually hey, it's possible to use a class to emulate a function pointer:

Code:

typedef float (CallbackPtr)(float);
class CCallback
{
public:
	CCallback(CallbackPtr CallbackFnc) : m_Callback(CallbackFnc) { }
	operator CallbackPtr* () { return m_Callback; }

private:
	CallbackPtr* m_Callback;
};

float Help2(float n) { return n; }

void Help()
{
	CCallback c = &Help2;
	float f = c(1.0f);
}

Pretty cool. I'll leave you to experiment on that if you wish to use it.
The original error was also that the constructor only takes std::string and not an int

What I'm really doing is modeling a function as you would write it on paper. In order to do that I need the "whole" function for each operation. For this it has to be in a vector of functions
so something like


cos(x) + x^2 + ax * 2


would go into a vector and look like

Code:

funcallback Array
0|cosCallback|
1|powCallback(2)|
2|multCallback|
3|identCallback(2)|

well i solved calling it, I just made the notation

Code:

(*a)(4)

and it works.

Elysia C++ offers function callbacks, which is what I'm using, so you don't really need to do all that for function objects, just use the overloaded operator() in a class.