策略模式

策略模式定义了一系列的算法，并将每一个算法封装起来，而且使它们还可以相互替换。策略模式让算法独立于使用它的客户而独立变化。

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优点：替代了继承，降低了耦合性

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#include <iostream>
using namespace std;
/*我们来陪电脑*/
class Base{
    protected:
        string name;
        public:
            Base()
            {
            }
            Base(string name)
            {
                this->name=name;
            }
            void show()
            {
                cout<<name<<endl;
            }
};
class Graphics:public Base{
        public:
            Graphics()
            {
                this->name="AMD";
            }
            Graphics(string name):Base(name){           
            }
            /*省略了修改name的函数*/
}; 
class CPU:public Base{
        public:
            CPU()
            {
                this->name="i5";
            }
            CPU(string name):Base(name)
            {

            }
            //.....
};
class computer{
    private:
        Graphics *graphics;
        CPU *cpu;
        public:
            computer()
            {
                this->graphics=new Graphics();
                this->cpu=new CPU();
            }
            void show()
            {
                cout<<"电脑的配置为"<<endl; 
                graphics->show();
                cpu->show();
            }
};
int main(void)
{
    computer *p=new computer();
    p->show();
    return 0;
}