Type-safe Callbacks in C++

// Test.cpp

#include "stdafx.h"
#include "Test.h"
#include "cList.h"


/*************************** Main Test *************************/

void cTest::StartDemo()
{
	printf("\n--> Inserting some words into the list:\n\n");

	// filling the list with words
	cList i_WordList;
	i_WordList.Append("This");
	i_WordList.Append("is");
	i_WordList.Append("a");
	i_WordList.Append("test");
	i_WordList.Append("!");
	
	i_WordList.Print();

	// --------------------------------------

	printf("\n\n\n--> Sorting words alphabetically:\n\n");

	// Generating a callback which takes two char* params and returns int.
	// The callback function is "SortByAlphabet()" and resides 
	// in the class "cTest" and has the instance pointer "this"
	cCallGen<cTest, int, char*, char*> i_Call_1(this, SortByAlphabet);

	// Setting the callback function for further calls to BubbleSort()
	i_WordList.SetCallback(&i_Call_1);

	i_WordList.BubbleSort();
	i_WordList.Print();

	// --------------------------------------

	printf("\n\n\n--> Sorting words by length:\n\n");

	// Generating a callback which takes two char* params and returns int.
	// The callback function is "SortByLength()" and resides 
	// in the class "cTest" and has the instance pointer "this"
	cCallGen<cTest, int, char*, char*> i_Call_2(this, SortByLength);

	// Setting the callback function for further calls to BubbleSort()
	i_WordList.SetCallback(&i_Call_2);

	i_WordList.BubbleSort();
	i_WordList.Print();

	printf("\n\n\nPress any key !");

	getchar();
	exit(0);
}


/********************************

  The callback functions have to return:
  <0 if Param1 < Param2
   0 if Param1 = Param2
  >0 if Param1 > Param2

/*******************************/


int cTest::SortByAlphabet(char* s8_Word1, char* s8_Word2)
{
	return stricmp(s8_Word1, s8_Word2);
}


int cTest::SortByLength(char* s8_Word1, char* s8_Word2)
{
	return strlen(s8_Word1) - strlen(s8_Word2);
}