我们可以使用函数指针创建适配器模式吗？ [英] Can we create an Adapter patterns using function pointers?

问题描述

我试图有一个Adapter类，它有一个函数指针（比如fnPtr）。并且基于不同的Adaptee类，fnPtr将被赋予相应的适配器功能。

以下是代码片段：

I was trying to have an Adapter class, which has a Function Pointer (say fnPtr). And based on different Adaptee classes the fnPtr will be assigned with corresponding adaptee`s function.
Following is the code snippet:

class AdapteeOne
	{
	public:
	int Responce1()
		{
		cout<<"Respose from One."<<endl;
		return 1;
		}
	};
class AdapteeTwo
	{
	public:
	int Responce2()
		{
		cout<<"Respose from Two."<<endl;
		return 2;
		}
	};
class Adapter
	{
	public:
		int (AdapteeOne::*fnptrOne)(void);
		int (AdapteeTwo::*fnptrTwo)(void);
	Adapter(AdapteeOne* adone)
		{
		fnptrOne =  &(AdapteeOne::Responce1);
		this->*fnptrOne();
		}
	Adapter(AdapteeTwo adtwo)
		{
		fnptrTwo =  &(AdapteeTwo::Responce2);
		}
	};
void main()
	{
	Adapter* adpter = new Adapter(new AdapteeOne());

	/////Place to call function pointers of Adapter class

	P;
	}

现在我面临的问题是在main（）函数中。我没有办法调用Adapter的函数指针（fnptrOne和fnptrTwo）。



请告诉我这是否是正确/可行的适配器模式？

Now the problem i am facing is in the main() function. I am not getting any way to call Adapter`s function pointers (fnptrOne and fnptrTwo).

Kindly let me know whether this is a correct/viable Adapter pattern?

推荐答案

您的适配器可能提供一个公共方法，比如执行，它依次使用 fnptrOne 或 fnptrTwo ，基于其内部状态（在实例化时在被调用的ctor上）。

Your adapter might provide a public method, say execute that in turns uses fnptrOne, or fnptrTwo, based on its internal state (that is on the called ctor at instantiation).

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