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print __FILE__ and __LINE__ using the # stringizing operator

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Article explains why STRINGIFY and TOSTRING are both needed.

This technique is useful for embedded apps to print debug strings to a debug console. ASSERT or TRACE statements can incorporate these macros. The line numbers are converted to strings at compile-time rather than run-time.

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  1. #define STRINGIFY(x) #x
  2. #define TOSTRING(x) STRINGIFY(x) 
  3. #define AT __FILE__ ":" TOSTRING(__LINE__)
  4.  
  5. printf( AT " message"); // Expect output like: "snipplr.c:5 message"

URL: http://www.decompile.com/cpp/faq/file_and_line_error_string.htm

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