TITLE: Catching exceptions in initializer lists


PROBLEM:  Randy T. Merkel <73537.3705@CompuServe.COM>

How does one catch a exception within a constructor that may be 
thrown from an initializer list?


RESPONSE: heliotis.roch803@xerox.com (Jim Heliotis)

You cannot catch exceptions from an initializer list, but that is often not
a problem, because C++ automatically destructs initialized components:

X::X( ... ): a(..), b(..), c(..), d(..) { .... }
                             |
                           BOOM!

	b gets destructed
	a gets destructed


RESPONSE: bs@research.att.com (Bjarne Stroustrup), 31 Jul 95

I agree that this is rarely a problem, but I and the standards committee felt
uncomfortable about there being no way, so you can now write something like
this:

	X::X( ... )
	try	
	: a(..), b(..), c(..), d(..)
	{
		// ...
	}
	catch(...) {
		// oops!
	}

to catch exceptions from an initializer list. That is the function body -
including the initializers - can be a try block.

This is a recent feature. Undoubtedly, it will take some time for it
to become widely available.