Add User Exception Handler

[Andrysky]

https://github.com/google/googletest/issues/3433

[derekmauro]

I commented on #3433 that we would not accept a patch that adds a custom exception handler, and it appears that is what this CL does.

[Andrysky]

I commented on #3433 that we would not accept a patch that adds a custom exception handler, and it appears that is what this CL does.

aa .. ( and why? if you need i add definitions so that this code is when adding some compile flag. and since custom exceptions can be anything - installing a handler is the only one option that I can see so far (

[davidmerwin]

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[davidmerwin]

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[Andrysky]

@derekmauro 👀

[beavis9k]

@derekmauro Can you explain why a custom handler won't be accepted? What would be accepted? I can dream up other ways than @Andrysky has implemented here, but they all ultimately require registering one or more functions/methods/lambdas with googletest to extract the additional information from the custom exception.

[peakschris]

We have the same need; our application uses two custom exception types (not derived from std::exception etc) and we need to be able to catch them whenever they are unexpectedly thrown from code under test and report their messages. This custom exception handler approach seems like a good, low-coupling way to extend gtest for these needs. I would request that you accept this patch.