例外和继承 [英] Exceptions and inheritance

问题描述

关于

异常的继承是如何工作的我有点困惑。


class ParentEx：public std :: exception

{

};


类SubEx：public ParentEx，std :: runtime_error

{

};


SubEx被捕获ParentEx或SubEx而被捕获，但不是

std :: exception。

为什么？


谢谢。

解决方案

Noah Roberts写道：

我对继承如何在
例外显然有点困惑。

类ParentEx：public std :: exception
{
};

类SubEx：public ParentEx，std :: runtime_error
{
};

SubEx被抓住了捕捉ParentEx或SubEx，但不是
std :: exception。

为什么？

因为std :: exception是不明确的基础。有两个。


-


Pete Becker

Dinkumware，Ltd。（ http://www.dinkumware.com ）

< blockquote>

Pete Becker写道：

因为std :: exception是一个含糊不清的基础。有两个。

标题中是否有两个或因为我使用多重继承

并且父母都来自该类？

Noah Roberts写道：

Pete Becker写道：

因为std :: exception是一个模糊的基础。有两个。
标题中是否有两个或因为我使用多个

继承并且父母都从该类派生？

这是因为多重继承。


希望这会有所帮助，

-shez-

I am a bit confused about how inheritance works with regard to
exceptions apparently.

class ParentEx : public std::exception
{
};

class SubEx : public ParentEx,std::runtime_error
{
};

SubEx is getting caught by catching ParentEx or SubEx, but not
std::exception.

Why?

Thanks.

解决方案

Noah Roberts wrote:

I am a bit confused about how inheritance works with regard to
exceptions apparently.

class ParentEx : public std::exception
{
};

class SubEx : public ParentEx,std::runtime_error
{
};

SubEx is getting caught by catching ParentEx or SubEx, but not
std::exception.

Why?

Because std::exception is an ambiguous base. There are two of them.

--

Pete Becker
Dinkumware, Ltd. (http://www.dinkumware.com)

Pete Becker wrote:

Because std::exception is an ambiguous base. There are two of them.

Is there two in the headers or because I am using multiple inheritance
and both parents derive from that class?

Noah Roberts wrote:

Pete Becker wrote:

Because std::exception is an ambiguous base. There are two of them.
Is there two in the headers or because I am using multiple

inheritance and both parents derive from that class?

It is because of the multiple inheritance.

Hope this helps,
-shez-

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