抛出C ++异常时抛出什么？ [英] What to throw when throwing C++ exceptions?

问题描述

这可能是一个愚蠢的问题，但是在C ++中，当我想抛出一个异常时，我会抛出什么？

This might be kind of a silly question, but in C++, when I want to throw an exception.. what do I throw?

我应该抛出std :: exception，还是由标准库保留？还是应该抛出一个字符串或int？或者我应该抛出任何我觉得是适当的？

Am I supposed to throw std::exception, or is that reserved by the standard library? Or should I throw a string or int? Or should I just throw whatever I feel is appropriate?

推荐答案

抛出一个派生自 std的类： ：例外;如果你 #include< stdexcept> ，你可以从一些现成的，有用的派生类。

Throw a class that's derived from std::exception; if you #include <stdexcept>, you can pick from a number of ready-made, useful derived classes.

从 std :: exception 允许您的处理程序遵循可识别的样式，因为您可以随时使用 .what（）获取文本消息。不要抛出原始类型，因为它们不携带语义信息。

Deriving from std::exception allows your handlers to follow a recognizable style, as you can always use .what() to get a textual message. Don't throw primitive types, since they carry no semantic information.

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