我应该从std :: exception继承吗？ [英] Should I inherit from std::exception?

问题描述

我已经看到至少一个可靠的源代码（一个C ++类）推荐C ++中的应用程序特定的异常类应该继承自 std :: exception 。我不清楚这种方法的好处。

I've seen at least one reliable source (a C++ class I took) recommend that application-specific exception classes in C++ should inherit from std::exception. I'm not clear on the benefits of this approach.

在C＃中继承 ApplicationException 的原因很清楚：你会得到一些有用的方法，属性和构造函数，只需要添加或覆盖你需要的。使用 std :: exception 看来，你得到的是一个 what（）覆盖的方法，你可以

In C# the reasons for inheriting from ApplicationException are clear: you get a handful of useful methods, properties and constructors and just have to add or override what you need. With std::exception it seems that all you get is a what() method to override, which you could just as well create yourself.

因此，如果使用 std :: exception 作为我的应用程序特定的异常类的基类？是否有任何好的理由不继承 std :: exception ？

So what are the benefits, if any, of using std::exception as a base class for my application-specific exception class? Are there any good reasons not to inherit from std::exception?

推荐答案

主要好处是使用你的类的代码不必知道你 throw 的确切类型，但可以 catch std :: exception 。



编辑：如Martin和其他人所说，你其实想从 std的子类派生： ：在< stdexcept> 标题中声明。

The main benefit is that code using your classes doesn't have to know exact type of what you throw at it, but can just catch the std::exception.

as Martin and others noted, you actually want to derive from one of the sub-classes of std::exception declared in <stdexcept> header.

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