继承与组合有什么区别? [英] What is the difference between inheritance and composition?

问题描述

正如标题所说，两者的含义使我难以理解.

As title says, the meaning of both eludes me.

推荐答案

继承表示一个is-a关系，而组合表示两个类之间的has-a关系.

Inheritance expresses a is-a relationship, while composition expresses a has-a relationship between the two classes.

多边形的一个例子是多边形.它具有点的有序序列.用C ++术语:

An example for composition is a polygon. It has a ordered sequence of Points. In C++ terms:

struct Polygon {
  std::vector<Point> points;
};

logic_error是exception时:

struct logic_error : public exception {
};

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