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Asked: May 10, 20262026-05-10T16:59:56+00:00 2026-05-10T16:59:56+00:00

Is there a way to get the C/C++ preprocessor or a template or such

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Is there a way to get the C/C++ preprocessor or a template or such to mangle/hash the __FILE__ and __LINE__ and perhaps some other external input like a build-number into a single short number that can be quoted in logs or error messages?

(The intention would be to be able to reverse it (to a list of candidates if its lossy) when needed when a customer quotes it in a bug report.)

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  1. 2026-05-10T16:59:56+00:00Added an answer on May 10, 2026 at 4:59 pm

    You will have to use a function to perform the hashing and create a code from __LINE__ and __FILE__ as the C preprocessor is not able to do such complex tasks.

    Anyway, you can take inspiration by this article to see if a different solution can be better suited to your situation.

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