Monday, June 10, 2013

finally{} should never throw

Principle EE -- exception throwing during exceptional stack unwinding is often disastrous.

--c++
dtor should never throw, largely because of EE.

--java
finall{} should not throw. It often runs due to some exceptionA (i.e. exceptional stack unwinding as in EE). If finally block itself  throws excetionB, then exceptionA is simply hidden. As bad as dtor throwing.

--c#
same as java finally{}

Special case: Dispose() should not throw. Dispose() often runs in finally{} or in finalizer (on the finalizer thread)

http://msdn.microsoft.com/en-us/library/bb386039.aspx shows 10 other places not to throw!

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