c++基础之三

                                  c++的特殊用法讲解

  

class BaseClass {
public:
	BaseClass();
	void Fun1();
};
void (BaseClass::*pmfnFunc1)() = &BaseClass::Fun1;
class Derived : public BaseClass {
	public:
		Derived();
		void Func2();
};
void (Derived::*pmfnFunc2)() = &Derived::Func2;
int main() {
	BaseClass ABase;
	Derived ADerived;
	(ABase.*pmfnFunc1)();
	//(ABase.*pmfnFunc2)();
	(ADerived.*pmfnFunc1)();
(ADerived.*pmfnFunc2)();
	return 0;
}

 

 函数指针的用法：

先看一段代码吧

 

typedef void (*EVALUATOR)(int);
class Parameter{
	EVALUATOR pEvaluator;
	public:
	Parameter() {}

	inline EVALUATOR Evaluator(EVALUATOR peva) {
		pEvaluator=peva;
		return peva;
	}
	inline EVALUATOR Evaluator() {
		return pEvaluator;
	}
};

 

 

#include <iostream>
#include <cmath>
#include <string>
#include "Paramter.h"
void add(int);
int main(){
	Parameter pa;
	pa.Evaluator(add);
	(*pa.Evaluator())(5);
	system("pause");
}
void add(int a){
	std::cout<<a<<std::endl;
}