function pointers in c++ classes

optimism_ · 12-02-2002

Hiya.

Im making my first game in c++ with DirectX, but at the moment i'm working on the control engine. I wanted to use function pointers to call a function specific to an object, an instance of my objects class. I have made a message stack, but want to have each message handled differently for each object i instaciate. Follow?

Any way, i'm a little stumpes on how to call this function, or even how to set it up. Currently, the prototype inside the class is

int (DefProcedure*)(UINT Msg, WPARAM wParam, LPARAM lParam);

But how would i then call this? So far the compiler has thrown back an error for every time i've tried to set the pointer to a function. Methods i've tried:

player.DefProcedure = proc();
CPlayer:

efProcedure = proc();
DefProcedure = proc();

even
player.DefProcedure() = proc()

yet everyone has been rejected. Please can someone correct this sow i can continue with the engine. Thx

optimism_

**Sebastiani** · 12-02-2002

Calling a function pointer in C++ is ugly. So the best way to do it is to encapsulate it in a friendlier package.

Code:

class Player { public:

int (Player:: * DefProcedure)(UINT Msg, WPARAM wParam, LPARAM lParam);

int Handle(UINT Msg, WPARAM wParam, LPARAM lParam){
(*this.*DefProcedure)(Msg, wParam, lParam);
}
int Kill(UINT Msg, WPARAM wParam, LPARAM lParam){
 //...
}
int ShowMercy(UINT Msg, WPARAM wParam, LPARAM lParam){
 //...
}
Player(){
DefProcedure = &Player::ShowMercy;
}
};

// syntax:

player.Handle(msg, wParam, lParam);

optimism_ · 12-02-2002

Thx

Thread: function pointers in c++ classes

Thread Tools

Search Thread

Display

function pointers in c++ classes

Similar Threads

Which Library Files for these unreferenced functions?

doubt in c parser coding

function pointers

Bisection Method function value at root incorrect

Contest Results - May 27, 2002