History: Exceptions In C Plus Plus

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Why we don't use exceptions in our code

As told by Mike Shaver to Dave Liebreich, 5-Dec-2005

some of the reasons exceptions are not used are:

problems with older compilers' implementation of exceptions. This reason will go away as we drop support for older compilers over time.
problems with exceptions that have to cross boundaries between C, C++, and/or XPCOM.
lots of the existing code is not exception-safe.

C++ templates are slowly being adopted, so it's not like we never use different stuff.