从构造函数的初始化程序列表中捕获异常 [英] Catching exceptions from a constructor's initializer list

问题描述

这很奇怪。我有一个类A。它有一个类B，我想使用初始化列表在A的构造函数中对其进行初始化，例如：

Here's a curious one. I have a class A. It has an item of class B, which I want to initialize in the constructor of A using an initializer list, like so:

class A {
    public:
    A(const B& b): mB(b) { };

    private:
    B mB;
};

是否有一种方法可以捕获仍在使用初始化程序的mB的复制构造函数引发的异常列出方法？还是我必须在构造函数的括号内初始化mB才能进行尝试/捕获？

Is there a way to catch exceptions that might be thrown by mB's copy-constructor while still using the initializer list method? Or would I have to initialize mB within the constructor's braces in order to have a try/catch?

推荐答案

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编辑：经过更多挖掘，这些被称为功能尝试块。

After more digging, these are called "Function try blocks".

我承认直到我继续寻找之前，我也不知道这一点。您每天都学到一些东西！我不知道这是否表明我如今很少使用C ++，我缺乏C ++知识或经常乱用该语言的拜占庭功能。嗯-我还是喜欢：）

I confess I didn't know this either until I went looking. You learn something every day! I don't know if this is an indictment of how little I get to use C++ these days, my lack of C++ knowledge, or the often Byzantine features that litter the language. Ah well - I still like it :)

为了确保人们不必跳到另一个站点，构造函数的try块的语法被证明是：

To ensure people don't have to jump to another site, the syntax of a function try block for constructors turns out to be:

C::C()
try : init1(), ..., initn()
{
  // Constructor
}
catch(...)
{
  // Handle exception
}

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