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Home » Tip Bank » C++
Language: C++
Expertise: All
Aug 1, 2001

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A Null Preprocessor Directive


An empty # sign is a null preprocessor directive. A null directive has no effect but you can use it to document your intentions, for example:
 
ifndef HEADER_INCLUDED
#define HEADER_INCLUDED
#else
# // do nothing
#endif
Danny Kalev
 
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