Function Pointers to a Member, from a Member

I have a problem with function pointers. Essentially, i am trying to create a function pointer from a member function of a class to another member function of the same class.

Things is, my compiler keeps on telling me "must use .* or ->* to call pointer-to-member function in `pFunct".

Code:

/*\
`* Draw - Doublebox Part Drawer
 * Draws a double-line box char. Takes a integer from 1-9 and uses a switch to
 * determine in which direction it would be on the keypad - ie, 1 would give the lower left corner, and so on.
 * Arguments : Amount of chracter to draw, Part to draw
 * Returns   : Null.
\*/
int Draw::DoubleBox(int ArgDrawAmount, int ArgPart)
{
	int Part = ArgPart;
	int DrawAmount = ArgDrawAmount;
 	switch (Part)
 		{
  	case 1 : Symbol(DrawAmount, 200);
  	break;
  	case 2 : Symbol(DrawAmount, 205);
  	break;
  	case 3 : Symbol(DrawAmount, 188);
  	break;
  	case 4 : Symbol(DrawAmount, 186);
  	break;
  	case 5 : Symbol(DrawAmount, 206);
  	break;
  	case 6 : Symbol(DrawAmount, 186);
  	break;
  	case 7 : Symbol(DrawAmount, 201);
  	break;
  	case 8 : Symbol(DrawAmount, 205);
  	break;
  	case 9 : Symbol(DrawAmount, 187);
  	break;
  	default: std::cout << "Error in Draw::DoubleBox\n";
  	break;
   	}
  return 0;
}

int Draw::CursorLocation( int ArgX, int ArgY )
{
  int X = ArgX;
  int Y = ArgY;
  COORD GoToCoordinate = { X , Y };
  HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
  SetConsoleCursorPosition (hConsole, GoToCoordinate);
  return 0;
}

/*\
 * Draw Box
 * Draws a box at an arbitrary location, of arbitrary size.
 * Takes   :Location Varibles and Size Varibles (in X and Y format), 
 * thickness variable (0 for single line, 1 for double line)
 * Returns :null
\*/
int Draw::Box (int ArgLocX, int ArgLocY, int ArgSizeX, int ArgSizeY , bool ArgThickness)
{
	int (Draw::*pFunct) (int,int) ; //Function pointer allows the function to choose whether to
	if (ArgThickness == TRUE)		//use DoubleBox or SingleBox, based on ArgThickness.
		pFunct = &Draw::DoubleBox;
	if (ArgThickness == FALSE)
		pFunct = &Draw::SingleBox;
		//checks to see if the resulting box is legal (ie fits on a 80 X 25 char screen, at least 2x2)
  if (ArgLocX + ArgSizeX + 1 > 81)
 		return 0;
  if (ArgLocY + ArgSizeY + 1 > 26)
  	return 0;
 	if (ArgSizeX < 2 || ArgSizeY < 2)
 		return 0;
 	CursorLocation(ArgLocX, ArgLocY); //next four lines define the top of the box
 	pFunct(1,7);
 	pFunct( (ArgSizeX - 2) , 8 );
 	pFunct(1,9);
 	int i; //counting var
 	for ( i = 1 ; i <= (ArgSizeY - 2) ; i++ )
 				{
 				CursorLocation ( ArgLocX, ( ArgLocY + i ) );
 				pFunct( 1 , 4 );
 				CursorLocation ( (ArgLocX + ArgSizeX - 1),(ArgLocY + i ) );
 				pFunct( 1 , 4 );
 				}
	CursorLocation( ArgLocX, ( ArgLocY + ArgSizeY - 1) ); //next four lines define the bottom of the box
 	pFunct(1,1);
 	pFunct( (ArgSizeX - 2) , 8 );
 	pFunct(1,3);
 	return 0;
}

the singlebox function is identical to doublebox, but with a different set of ascii codes.

Draw::Symbol just uses cout << (char) *asciicode* to ..... draw a symbol.

i was thinking about using a global function (not in a class) to feed the function the appropriate pointer, but thought that it would be a bit cumbersome. Also i thought about using an IF statement, duplicating the code and replacing pFunct with the actual function name, but i really want to know :) .... sure you all understand.

The syntax is:

(*this.*pFunct)(10, 20);

or

(this->*pFunct)(10, 20);

I usually use a macro:

#define THIS(member) (*this.*member)

ie:

THIS(pFunct)(10, 20);

doesn't seem to work - is it supposed to be

int (*this->*pFunct) (int,int) ;

as the declaration? Maybe its my compiler - im using Dev-C++ 4.9.8.4 beta.

Your declaration was fine. What I gave you was the syntax for *calling* a member function.

thanks - got it now *eternal smile*

aslo kudos for putting up with my n00b stupidity.