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将抽象部分与它的实现部分分离，使它们都可以独立地变化。它是一种对象结构型模式，又称为柄体(Handle and Body)模式或接口(Interface)模式。

#include <iostream>
using namespace std;// Abstractionclass Abstraction {
public:virtual void Operation() = 0;virtual ~Abstraction() { }
protected:Abstraction() { }
};// AbstractionImpclass AbstractionImp :public Abstraction {
public:virtual void Operation() = 0;virtual ~AbstractionImp() { }
protected:AbstractionImp() { }
};class ConcreteAbstractionImp :public AbstractionImp {
public:void Operation() {cout << "ConcreteAbstractionImp Operation..." << endl;}
};class RefinedAbstraction :public Abstraction {
public:RefinedAbstraction(AbstractionImp *imp) {_imp = imp;}void Operation() {_imp->Operation();}
private:AbstractionImp *_imp;
};int main() {AbstractionImp *imp = new ConcreteAbstractionImp();Abstraction *abs = new RefinedAbstraction(imp);abs->Operation();delete imp;delete abs;return 0;
}