Error directive
From cppreference.com
< cpp | preprocessor
Shows the given error message and renders the program ill-formed.
[edit] Syntax
#error error_message
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[edit] Explanation
After encountering the #error
directive, an implementation displays the diagnostic message error_message and renders the program ill-formed (the compilation stops).
error_message can consist of several words not necessarily in quotes.
[edit] See also
C documentation for Error directive
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