Im currently learning how to implement function pointers for my 2D game project. Im planning to use them to run AI for the game. The idea is to have a single class called TaskManager which has the collection of all the AI functions and a Object struct thats stores and run an AI function on under certain condition.
The codes i have written so far for testing:
AppMain.cpp
include <iostream>
#include "Board.h"
#include "TaskMgr.h"
using namespace std;
void main (void) {
Board * newBoard;
newBoard = new Board();
newBoard->test->mf_RunAI();
cout<<newBoard->test->haha;
}
Board.h and .cpp where the game is runned
class TaskMgr;
struct Unit {
int haha;
TaskMgr * Mgr;
void (TaskMgr::*pt2member)(Unit *);
void mf_RunAI() { (Mgr->*pt2member)(this); };
};
class Board
{
public:
Board(void);
~Board(void);
Unit * test;
TaskMgr * mTMgr;
};
Board::Board(void)
{
mTMgr = new TaskMgr();
test = new Unit;
mTMgr->SetUp(test);
}
Board::~Board(void)
{
}
TaskMgr.h and .cpp where the tasks are assigned to units
struct Unit;
class TaskMgr
{
public:
TaskMgr(void);
~TaskMgr(void);
void SetUp(Unit *);
void Addition(Unit *);
void Subtraction(Unit *);
};
TaskMgr::TaskMgr(void)
{
}
TaskMgr::~TaskMgr(void)
{
}
void TaskMgr::SetUp(Unit * target) {
target->haha = 0;
target->Mgr = this;
target->pt2member = &TaskMgr::Addition;
}
void TaskMgr::Addition(Unit * target) {
target->haha++;
}
void TaskMgr::Subtraction(Unit * target) {
target->haha--;
}
The code compiles fine but when i run it there is an access violation error that occurs at the line.
void mf_RunAI() { (Mgr->*pt2member)(this); };
Please help me out with this as it is very important to the game. Thanks.
P.S. Im sorry that i did not put the codes in a code tag because i don't know how to. If anyone can tell me how please do.
Edit: Codes in source tag thanks to silothesuper :P
[Edited by - Flying_Dagger on August 20, 2006 3:05:30 AM]
