钻石继承(C++)

Diamond inheritance (C++)(钻石继承(C++))

问题描述

我知道拥有钻石继承被认为是不好的做法.但是，我有两个案例，我觉得钻石继承非常适合.我想问一下，在这些情况下你会推荐我使用菱形继承，还是有其他更好的设计.

I know that having diamond inheritance is considered bad practice. However, I have 2 cases in which I feel that diamond inheritance could fit very nicely. I want to ask, would you recommend me to use diamond inheritance in these cases, or is there another design that could be better.

案例 1: 我想在我的系统中创建代表不同类型操作"的类.动作由几个参数分类:

Case 1: I want to create classes that represent different kinds of "Actions" in my system. The actions are classified by several parameters:

• 操作可以是读取"或写入".
• 动作可以有延迟或没有延迟(它不仅仅是 1 个参数.它会显着改变行为).
• 动作的流类型"可以是 FlowA 或 FlowB.

我打算有以下设计:

// abstract classes
class Action  
{
    // methods relevant for all actions
};
class ActionRead      : public virtual Action  
{
    // methods related to reading
};
class ActionWrite     : public virtual Action  
{
    // methods related to writing
};
class ActionWithDelay : public virtual Action  
{
    // methods related to delay definition and handling
};
class ActionNoDelay   : public virtual Action  {/*...*