设计模式 -- 策略模式 + 简单工程模式（C++）

策略模式和简单工厂模式图，（基本一样）

class basicObject
{
public:
virtual double GetResult()
{
double dResult=0;
return dResult;
}
protected:
int tempa;
int tempb;
};

class oneOperation : public basicObject
{
public:
oneOperation(int a,int b)
{
tempa=a;
tempb=b;
}
virtual double GetResult()
{
return (tempa * tempb) / 10;
}
};

class twoOperation : public basicObject
{
public:
twoOperation(int a,int b)
{
tempa=a;
tempb=b;
}
virtual double GetResult()
{
return (tempa * tempb - 300);
}
};

class Context
{
private:
basicObject* obj;
public:
Context(int cType, int valueT)
{
switch (cType)
{
case 1:
obj=new oneOperation(valueT, 8);
break;
case 2:

default:
obj=new twoOperation(valueT, 2);
break;
}
}
double GetResult()
{
return obj->GetResult();
}
};

#include "classFile.h"
#include "stdlib.h"
#include <iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
int a = 500, b = 1;
Context * test = new Context(b, a);
cout << "value = " << test->GetResult() << endl;
system("pause");
return 0;