如果存在两个#defines，如何强制编译错误？ [英] How do I force a compiler error if two #defines exist?

问题描述

我有一个可以用#defines编译的项目。


说： -

#define firstdef

#define seconddef


如果没有定义或只有一个定义，则一切正常。如果两个

#defines都存在，我会在代码中添加一个自检来防止编译。这可能吗？

解决方案

9月24日，9月27日，Eliot< e ... @ hotmail.comwrote：

我有一个项目可以用一些#defines编译。


说： -

#define firstdef

#define seconddef


如果没有定义或只有一个定义，则一切正常。如果两个

#defines都存在，我会在代码中添加一个自检来防止编译。这可能吗？

#if defined（firstdef）&&已定义（seconddef）

#error"无法定义firstdef和seconddef"

#endif

< blockquote>文章< 11 ********************* @ n39g2000hsh.googlegroups。 com>，

Eliot< eb*@hotmail.comwrote：

> #define firstdef
#define seconddef

如果没有定义或只有一个定义，则一切正常。如果两个
＃define都存在，我会想要在代码中添加自检以阻止编译。这可能吗？

#if defined（firstdef）&&定义（seconddef）

#error不能定义两个

#endif


- Richard

-

在一些字母表中需要考虑多达32个字符

- X3.4,1963。

Eliot< eb*@hotmail.comwrote：

>我有一个项目可以用一些#defines编译。

说： -
#define firstdef
#define seconddef

如果没有定义是现在或只有一个存在都可以。如果两个
＃define都存在，我会想要在代码中添加自检以阻止编译。这可能吗？

#if defined（fistdef）&&定义（secondef）

#error不要这样做！

#endif

Roberto Waltman


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I have a project which may be compiled with some #defines.

Say:-
#define firstdef
#define seconddef

If no defines are present or only one is present all is OK. I would
like to add a self check to the code that prevents compilation if both
#defines are present. Is this possible?

解决方案

On 9 24 , 9 27 , Eliot <[e-mail]:

I have a project which may be compiled with some #defines.

Say:-
#define firstdef
#define seconddef

If no defines are present or only one is present all is OK. I would
like to add a self check to the code that prevents compilation if both
#defines are present. Is this possible?

#if defined(firstdef) && defined(seconddef)
#error "Cannot define both firstdef and seconddef"
#endif

In article <11*********************@n39g2000hsh.googlegroups. com>,
Eliot <eb*@hotmail.comwrote:

>#define firstdef
#define seconddef

If no defines are present or only one is present all is OK. I would
like to add a self check to the code that prevents compilation if both
#defines are present. Is this possible?

#if defined(firstdef) && defined(seconddef)
#error Mustn''t define both
#endif

-- Richard
--
"Consideration shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.

Eliot <eb*@hotmail.comwrote:

>I have a project which may be compiled with some #defines.

Say:-
#define firstdef
#define seconddef

If no defines are present or only one is present all is OK. I would
like to add a self check to the code that prevents compilation if both
#defines are present. Is this possible?

#if defined(fistdef) && defined(secondef)
#error Don''t do this!
#endif
Roberto Waltman

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