类继承/组合的设计 [英] design of class inheritance/compostion

问题描述

我有两个类：一个读者和一个作家。对于这两个类，我有一个抽象的接口，因为数据源/目标应该是灵活的：

I do have two classes: a reader and a writer. For both classes I have an abstract interface since the data source/target should be flexible:

class abstract_reader {
...
};

class concrete_reader : public abstract_reader {
   DATATYPE m_data;
...
};    
class abstract_writer {
...
};

class concrete_writer : public abstract_writer {
   DATATYPE m_data;
...
};

写入器应具有读取和写入功能。具体写入器的读取部分的实现是与实现的concrete_reader相同。什么是合并这些类的好方法？

The writer shall have both functionalities, to read and to write The implementation of the reading part of the concrete_writer is the same as the implementation of the concrete_reader. What would be a good way to combine these classes?

推荐答案

你想要的是有点混乱，方法：

What you want is a little confusing, but there is a number of ways:

• 从两个抽象类派生作者




• 从写入器中删除读取功能，并创建第三个类，它可以读取和写。

就我个人而言，我会遵循最后一种方式，那么你将有一套完整的类来进行只读，和做这两个。

Personally, I would follow the last way, then you will have a full set of classes for reading-only, writing-only, and for doing both.

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