| description | Learn more about: #error directive (C/C++) | |||
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| title | #error directive (C/C++) | |||
| ms.date | 08/29/2019 | |||
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The #error directive emits a user-specified error message at compile time. Then it terminates the compilation.
#error token-string
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, to notify 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