在C ++中取消对typedef的定义? [英] Undef a typedef in C++?

问题描述

我正在处理一个大型项目，该项目的文件中有一行A.h

I am working on a huge project which has one file A.h whose code has a line

typedef unsigned __int16   Elf64_Half;

此外，由于我在Linux上构建并使用dlinfo函数，因此我必须在项目中包含link.h文件.这就是它造成冲突的地方，因为我有两个具有相同名称Elf64_Half的typedef. (Linux link.h包括elftypes.h，它也具有:typedef unsigned short Elf64_Half;).

Also since I am building on Linux and using dlinfo function, I have to include link.h file in my project. And this is where it creates a conflict because I have two typedefs having the same name Elf64_Half. (Linux link.h includes elftypes.h and it too has: typedef unsigned short Elf64_Half;).

在这种情况下我该怎么办?我唯一的选择是更改a.h中的typedef吗?请记住，这并不是一件容易的事，因为该项目非常庞大，我将不得不在几个地方进行更改.

What do I do in such a case? Is the only option I have, to change my typedef in a.h? Remember it is not too easy because the project is huge and I will have to make a change in several places.

是否可以取消定义 typedef或其他方法?

Is there a way to undef a typedef or something?

推荐答案

为澄清起见，Rahul Manne提供了一个简单的解决方案.做

For clarification, Rahul Manne gave an easy solution. Do

#define Elf64_Half The_Elf64_Half_I_dont_care
#include<link.h>
#undef Elf64_Half
#include<A.h>

/*
 * Code here and use Elf64_Half from A.h as you like.
 * However, you can't use Elf64_Half from link.h here
 * or you have to call it The_Elf64_Half_I_dont_care.
 *
 */

这会将link.h中的每个Elf64_Half替换为The_Elf64_Half_I_dont_care，因此您不会与A.h发生冲突.只要您不想显式使用link.h的Elf64_Half，就可以正常工作.您只需要记住link.h中的Elf64_Half现在被称为The_Elf64_Half_I_dont_care，以防您不得不在此文件中显式使用它.

This will substitute each Elf64_Half in link.h with The_Elf64_Half_I_dont_care and thus you get no conflicts with A.h. As long as you don't want to use Elf64_Half of link.h explicitly that will work with no problems. You just have to remember that Elf64_Half from link.h is now called The_Elf64_Half_I_dont_care in case you ever have to use it explicitly in this file.

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