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
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
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