#undef

The #undef directive removes the current definition of the specified name. All subsequent occurrences of the name are processed without replacement.


#undef name

name

Name to be removed. This value is any combination of letters, digits, and punctuation that is valid for the C/C++ preprocessor.

Example

This example removes the definitions for the names nonzero and USERCLASS:

#undef     nonzero
#undef     USERCLASS

Related topics

Preprocessor Directives

 

 

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