__try和__exception便携 [英] __try and __exception portability

问题描述

您好，再次原谅我

我从英特尔阅读检测的多处理器拓扑在IA-32架构。我被重新编码的例子。不过，我读了code本句__try和__except。

I am reading "Detecting Multiprocessor Topology in IA-32 Architecture" from Intel. I was recoding the example. However I read this sentences __try and __except in the code.

我发现MSDN Microsoft网页的一些信息，但是我用gcc编译器/连接

I found MSDN Microsoft web page some information but I am using gcc compiler/linker

在GCC __try和__except有效的句子？
是__try和__except便携式句子在*马钱的环境？
确实存在比__try和__except语句异常处理一个更好的模式，用C？

are __try and __except valid sentences in gcc? are __try and __except portable sentences on *nux environments? do exist a better mode than __try and __except sentences for exception handling in C?

在此先感谢。

推荐答案

根据 MSDN ， __试和 __除了是扩展C语言。因此，它们是不可移植的开箱即用的。

General considerations

According to MSDN, __try and __except are extensions to the C language. As such, they are not portable out of the box.

对于某些应用程序有可能模仿他们的行为使用宏和的setjmp / 的longjmp 结构。一般来说，这将不会是这样。特别是，MSDN指出

For some applications it might be possible to mimic their behaviour using macros and a setjmp/longjmp constructs. In general this will not be the case. In particular, MSDN states that

的 __除了前pression的范围执行 __试的身体。

The __except expression executes in the scope of the __try body.

不能单独使用宏来实现。

which cannot be achieved using macros alone.

是 __试和 __除了在GCC有效的句子？

are __try and __except valid sentences in gcc?

没有，他们没有，因为GCC不支持C的这种微软的方言。

No, they are not, as gcc does not support this Microsoft dialect of C.

是__try和__except便携式句子在*马钱的环境？

are __try and __except portable sentences on *nux environments?

没有，他们没有，虽然有一些方法来实现类似的异常处理在* nix为好。

No, they are not, although there are ways to achieve similar exception handling on *nix as well.

确实存在比__try和__except语句异常处理一个更好的模式，用C？

do exist a better mode than __try and __except sentences for exception handling in C?

有一个强有力的理由来使用C ++，当你做异常处理。 C ++范围与析构函数对象是比例外标准C资源管理的presence更健壮。因此，尽管它们提供的实现尝试和抓对于C这种或那种方式，我建议对他们和赞成C ++来代替。在C ++异常处理是标准的一部分，因此，所有符合标准的编译器的支持，没有可移植性问题。

There is a strong reason to use C++ when you do exception handling. C++ scoped objects with destructors are much more robust in the presence of exceptions than standard C resource management. So while there are implementations which provide tryand catch for C one way or another, I'd advise against them and favor C++ instead. Exception handling in C++ is part of the standard and therefore supported by all standards-compliant compilers, without portability issues.

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