是否可以将C ++函数标记为Extern"C"?扔? [英] Can C++ functions marked as Extern "C" throw?

问题描述

我有要使用extern "C"声明的C ++函数，即使它们仅在C ++代码中调用.是的，我知道这很奇怪，但是我想这样做是为了保持一致性，因为我们混合使用了C和C ++声明.我只想确保将C ++函数声明为extern "C"不会影响抛出的行为.

I've got C++ functions that I want to declare using extern "C" even though they are only called in C++ code. Yes, I know this is strange but it's something I would like to do for consistency since we have mixed C and C++ declarations. I just want to make sure that declaring a C++ function as extern "C" won't affect the behavior of throwing.

它看起来像这样:

extern "C" void foo() {throw exception;}

int bar()
{
    try
    {
        foo();
    } catch (exception e) { return 1; }
}

推荐答案

"C ++函数是否可以标记为Extern"C"?"

"Can C++ functions marked as Extern "C" throw?"

是，从某种意义上说，语言和编译器都不会阻止您这样做.

Yes, in the sense that neither the language nor the compiler will prevent you from doing so.

否，从某种意义上讲，如果抛出，则将是不确定的行为，因为C ++异常会跨越语言边界.

No, in the sense that if you throw, it would be an undefined behaviour, as the C++ exception crosses language boundaries.

在实践中:不要这样做.捕获异常并将其转换为错误代码，或者将其翻译为其他语言可以理解的方式.

In practice: do not do it. Catch the exception and translate it into an error code, or a means the other language can understand.

因此，最重要的是:请勿引发标记为extern "C"的函数的异常.

So the bottomline is: do NOT throw exception from functions marked as extern "C".

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