Function pointer with in classes

[themadme]

Ok im trying to use function pointer with in a class. So far i have this

cpp file

 
void Camera::vUpdate( const float &fTimeMovement )
    {        
        vec2Rotation = C_Input.vec2Update( fTimeMovement, vStrafeCamera, vMoveCameraFoward );
    }
 
    void Camera::vStrafeCamera( const float &fMovement )
    {
           // does stuff
    }
 
    void Camera::vMoveCameraFoward( const float &fMovement )
    {
        // does stuff
    }
 
 

the vec2Update is a function from a different class with in the program which looks like this

D3DXVECTOR2 vec2Update( const float &fTimeMovement, void (*Strafe)(const float&), void (*Advance)(const float&) )
{
              // stuff
}
 

Error 1 error C3867: 'Graphics::Camera::vStrafeCamera': function call missing argument list; use '&Graphics::Camera::vStrafeCamera' to create a pointer to member c:\Users\Lee\Desktop\Summer

The problem is that the compiler i think gets confused, thinking i need to pass a variable through the functions like so ->

vec2Update( fTimeMovement, vStrafeCamera(variable), vMoveCameraFoward(variable) )

of course, with out compiling, you can see that would be completely wrong.

so any ideas how to fix this problem? with out making the functions global?

[Sirmont]

Unfortunately, you can't do what you are doing. A method and a function aren't the same thing. So you declaration of vec2Update is wrong if it is a member function you want to pass. Also, you have to be conscious that a method is always associated to an object, while a function is all alone in the universe.

So your definition/declaration of vec2Update should be written like this:

D3DXVECTOR2 vec2Update( const float &fTimeMovement, Camera* Cam, void (Camera::* Strafe)(const float&), void (Camera::*Advance)(const float&) )
{
  // Now you can call:
  (Cam->*Strafe)(1.2);
  (Cam->*Advance)(3.1);
}
 

Than your call would be:

vec2Rotation = C_Input.vec2Update( fTimeMovement, this, &Camera::vStrafeCamera, &Camera::vMoveCameraFoward );
 

Hope this helps!

[themadme]

thank you very much for your help