The #error Directive Error directives produce compiler-time error messages.Syntax#error token-stringThe error messages include the argument token-string and are 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:#if !defined(__cplusplus) #error C++ compiler required. #endifWhen #error directives are encountered, compilation terminates. ------------------- from MSDN
Error directives produce compiler-time error messages.Syntax#error token-stringThe error messages include the argument token-string and are 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:#if !defined(__cplusplus)
#error C++ compiler required.
#endifWhen #error directives are encountered, compilation terminates.
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from MSDN