| title |
#error Directive (C/C++) | Microsoft Docs |
| ms.custom |
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| ms.date |
11/04/2016 |
| ms.technology |
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| ms.topic |
reference |
| f1_keywords |
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| dev_langs |
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| helpviewer_keywords |
#error directive |
preprocessor, directives |
error directive (#error directive) |
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d550a802-ff19-4347-9597-688935d23b2b |
| author |
corob-msft |
| ms.author |
corob |
| ms.workload |
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The #error directive emits a user-specified error message at compile time and then terminates the compilation.
Remarks
The error message that this directive emits includes the token-string parameter. The token-string parameter is not subject to macro expansion. This directive is most useful during preprocessing for notifying the developer of a program inconsistency or the violation of a constraint. The following example demonstrates error processing during preprocessing:
#if !defined(__cplusplus)
#error C++ compiler required.
#endif
Preprocessor Directives