On 6/30/2010 12:13 AM, Дамјан Георгиевски wrote:
A 'raise-yield' expression would break the flow of a program just like
an exception, going up the call stack until it would be handled, but
also like yield it would be possible to continue the flow of the
program from where it was raise-yield-ed.
Bad idea. Continuing after an exception is generally troublesome.
This was discussed during the design phase of Ada, and rejected.
Since then, it's been accepted that continuing after an exception
is a terrible idea. The stack has already been unwound, for example.
What you want, in in the situation you describe, is an optional
callback, to be called in case of a fixable problem. Then the
caller gets control, but without stack unwinding.
John Nagle
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