#error

[guoxianyu521]

#error 麻烦给我个“实例”，及何时使用？

[lingyin55]

The #error Directive

Error directives produce compiler-time error messages.


#error token-string


Remarks
The error messages include the argument token-string and are currently not subject to macro expansion. These directives are most useful for detecting programmer inconsistencies and violation of constraints during preprocessing. The following example demonstrates error processing during preprocessing:

Copy Code
#if !defined(__cplusplus)
#error C++ compiler required.
#endif


When #error directives are encountered, compilation terminates.

[asksgp]

#error 错误宏，具体意思的结合前后代码

[guoxianyu521]

[Quote=引用 1 楼 lingyin55 的回复:]
The #error Directive 

Error directives produce compiler-time error messages.


#error token-string


Remarks
The error messages include the argument token-string and are currently not subject to macro expansion. These directives are most useful for detecting programmer inconsistencies and violation of constraints during preprocessing. The following example demonstrates error processing during preprocessing:

  Copy Code
#if !defined(__cplusplus)
#error C++ compiler required.
#endif


When #error directives are encountered, compilation terminates.

[/Quote]



请问前辈，这些东西是在哪找到的？

[飞天御剑流]

#error语法如下：

#error 信息

例如：

#error This software requires the UNIX OS.

这条指令主要给出错误信息，上面的这个例子就是输出This software requires the UNIX OS.

[guoxianyu521]

想起来了，是CSDN上的原话。


麻烦前辈们，给我个“实例”。我不会用呀！！

[sttony]

#if !defined(__cplusplus)
#error C++ compiler required.
#endif

如果没有定义c++宏,编译的时候输出错误信息， C++ compiler required.

注意是编译的时候，出现在编译的shell输出上

[guoxianyu521]

[Quote=引用 6 楼 sttony 的回复:]
#if !defined(__cplusplus)
#error C++ compiler required.
#endif

如果没有定义c++宏,编译的时候输出错误信息， C++ compiler required.

注意是编译的时候，出现在编译的shell输出上
[/Quote]

我把代码copy到vc上也没有啥反应呀？？
我想要一个可以直接在vc上运行且有反应的代码。嘿嘿，有劳大家了！

[满衣兄]

例子:

#if !defined(__cplusplus1) 
#error C++ compiler required. 
#endif 

int _tmain(int argc, _TCHAR* argv[])
{
	return 0;
}

编译的时候就会报错:C++ compiler required
输出如下:
1>------ 已启动全部重新生成: 项目: asfsafd, 配置: Debug Win32 ------
1>Deleting intermediate and output files for project 'asfsafd', configuration 'Debug|Win32'
1>Compiling...
1>stdafx.cpp
1>asfsafd.cpp
1>e:\test\asfsafd\asfsafd\asfsafd.cpp(7) : fatal error C1189: #error : C++ compiler required. 1>Generating Code...
1>Build log was saved at "file://e:\test\asfsafd\asfsafd\Debug\BuildLog.htm"
1>asfsafd - 1 error(s), 0 warning(s)
========== 全部重新生成: 0 已成功, 1 已失败, 0 已跳过 ==========