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组合模式:将对象组合成属性结构以表示“部分-整体”的层次结构,是的客户端对单个对象的和组合对象具有一直的组合方式。
场景:
1.想表示整体-部分的层次关系;
2.希望忽略组合对象和单个对象的不同,用户统一使用组合结构中的所有对象。
#include <stdio.h>
#include <vector>
//绘制接口
class IDraw {
public:
virtual void draw() {
}
};
class Text :public IDraw {
public:
void draw() {
printf("绘制艺术字!\n");
}
};
class Rect :public IDraw {
public:
void draw() {
printf("绘制矩形!\n");
}
};
class Circle :public IDraw {
public:
void draw() {
printf("绘制圆形!\n");
}
};
class Picture :public IDraw {
public:
void addItem(IDraw* item) {
_items.push_back(item);
}
void draw() {
printf("绘制图画!\n");
std::vector<IDraw*>::iterator it;
for(it = _items.begin(); it != _items.end(); it++){
(*it)->draw();
}
}
private:
std::vector<IDraw*> _items;
};
int main() {
Picture* pic = new Picture;
Text* text = new Text;
Circle* circle = new Circle;
Rect* rect = new Rect;
pic->addItem(text);
pic->addItem(circle);
pic->addItem(rect);
pic->draw();
return 0;
}
运行结果: