How to pass non-fatal warnings from a library

Posted by wRAR on Stack Overflow See other posts from Stack Overflow or by wRAR
Published on 2010-03-19T14:33:05Z Indexed on 2010/03/19 14:41 UTC
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best-practices

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language-agnostic

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error-handling

A library function parses a file and returns an object. If a parser encounters unknown data, missing values etc., it shouldn't throw an exception and stop parsing (because this is not fatal), but there should be a way to pass information about these things to a caller (so that warnings can be displayed in the UI, for example). How can these warning be returned? I'm thinking of passing a callback function/object into the library, are there any other possible solutions?

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