c++ function pointer demo

function_object.cpp

#include <iostream>
using namespace std;

class AttackFunctionObject
{
public:
	virtual void operator()(int damage)
	{
		printf("attack\n");
	}
};

class BossAttack : public AttackFunctionObject
{
public:
	virtual void operator()(int damage)
	{
		printf("boss attack with %d damages\n", damage);
	}
};

class MobAttack : public AttackFunctionObject
{
public:
	virtual void operator()(int damage)
	{
		printf("mob attack with %d damages\n", damage);
	}
};
int main()
{
	AttackFunctionObject* attack_function;
	{// if this and that and what ever
		attack_function = new MobAttack();
		(*attack_function)(10);
		delete attack_function;
	}
	{// if this and that and what ever
		attack_function = new BossAttack();
		(*attack_function)(10);
		delete attack_function;
	}
	
	system("pause");
	return 0;
}

function_pointer.cpp

#include <iostream>

class Mob
{
public:
	int damage;
	Mob()
	{
		damage = 99;
	}
	void Attack(int target)
	{
		printf("Mob::Attack inflict %d damages to %d\n", damage, target);
	}
	static void Fly(int height)
	{
		printf("Mob::Fly fly up to %d m height\n", height);
	}
};

void Mob__Attack(int damage, int target)
{
	printf("Mob__Attack inflict %d damages to %d\n", damage, target);
}

#define DECLARE_STATIC_FUNCTION(name, ...) typedef void (*name) (__VA_ARGS__)
#define DECLARE_MEMBER_FUNCTION(class, name, ...) typedef void (class::*name) (__VA_ARGS__)

int main()
{
	Mob* mob = new Mob();
	{
		typedef void (*Attack_Static) (int, int);
		Attack_Static attack_function = &Mob__Attack;
		(*attack_function)(12, 4);
	}
	{
		DECLARE_STATIC_FUNCTION(Attack_Static, int, int);
		Attack_Static attack_function = &Mob__Attack;
		(*attack_function)(12, 4);
	}
	{
		typedef void (Mob::*Attack_ClassMember)(int);
		Attack_ClassMember attack_function = &Mob::Attack;
		(mob->*attack_function)(4);
	}
	{
		DECLARE_MEMBER_FUNCTION(Mob, Attack_ClassMember, int);
		Attack_ClassMember attack_function = &Mob::Attack;
		(mob->*attack_function)(4);
	}
	{
		typedef void(*FLy_StaticMember)(int);
		FLy_StaticMember fly_function = &Mob::Fly;
		(*fly_function)(20);
	}
	{
		DECLARE_STATIC_FUNCTION(FLy_StaticMember, int);
		FLy_StaticMember fly_function = &Mob::Fly;
		(*fly_function)(20);
	}
	system("pause");
	return 0;
}