是嵌套函数在GCC坏事？ [英] Are nested functions a bad thing in gcc?

问题描述

我知道嵌套函数不是标准C的一部分，但因为他们是在海湾合作委员会present（而事实上，GCC是我关心的只是编译器），我倾向于经常使用它们。

I know that nested functions are not part of the standard C, but since they're present in gcc (and the fact that gcc is the only compiler i care about), i tend to use them quite often.

这是一件坏事？如果是这样，你能告诉我一些讨厌的例子吗？
什么是在GCC嵌套函数的状态？他们是否会被删除？

Is this a bad thing ? If so, could you show me some nasty examples ? What's the status of nested functions in gcc ? Are they going to be removed ?

感谢

推荐答案

嵌套函数真的没有做任何事情，你不能用非嵌套的人做的（这就是为什么既不是C和C ++为他们提供）。你说你不感兴趣的其他编译器 - 也可能在这一刻是atrue，但谁知道将来会带来什么？我会避开他们，与所有其他海湾合作委员会增强沿。

Nested functions really don't do anything that you can't do with non-nested ones (which is why neither C nor C++ provide them). You say you are not interested in other compilers - well this may be atrue at this moment, but who knows what the future will bring? I would avoid them, along with all other GCC "enhancements".

一个小故事来说明这一点 - 我用来为英国Polytechinc它主要用于DEC箱的工作 - 特别是在DEC-10和一些VAXen。所有工程学院使用的许多DEC扩展其code与Fortran - 他们确信我们仍然是一个DEC店永远。然后，我们与IBM大型机，谁的FORTRAN编译器不支持任何扩展取代了DEC-10。有很多哭，并在这一天咬牙切齿，我可以告诉你。我自己的FORTRAN code（8080仿真器）移植到了IBM在几个小时（几乎全部用在了学习驾驶IBM的编译器），因为我在写它的沼泽标准FORTRAN-77。

A small story to illustrate this - I used to work for a UK Polytechinc which mostly used DEC boxes - specifically a DEC-10 and some VAXen. All the engineering faculty used the many DEC extensions to FORTRAN in their code - they were certain that we would remain a DEC shop forever. And then we replaced the DEC-10 with an IBM mainframe, who's FORTRAN compiler didn't support any of the extensions. There was much wailing and gnashing of teeth on that day, I can tell you. My own FORTRAN code (an 8080 simulator) ported over to the IBM in a couple of hours (almost all taken up with learning how to drive the IBM compiler), because I had written it in bog-standard FORTRAN-77.

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