Hi Tobias! On 9/22/07, Tobias Schwinger <tschwinger@isonews2.com> wrote:

Dean Michael Berris wrote:

...

Would there be a way for me to iterate through every element of 'ints' and apply the function object instance to each element, and stop the iteration only when function does not throw?

No.

I thought so. That confirms my suspicion that there isn't an obvious way of doing it. :-)

...

I know using exceptions for control flow is pretty frowned upon,

...and pretty inefficient, unless to terminate a deep recursion.

But to answer you're question, you can of course wrap another function around yours that throws if it doesn't catch anything :-).

This makes sense, but a little too convoluted for my taste. It's one of the options, and I don't know if there's even an alternative that'll be easy to use aside from the above suggestion. Thanks for the idea. ;)

Reading the rest of your post, it seems you're basically looking for algorithms like these:

visit_if(sequence_reference,runtime_predicate,action) visit_where_first(sequence_reference,runtime_predicate,action)

Close, but not quite... I'm thinking of a fusion function (if there isn't one already) which short-circuits (or returns) when it finds the first element of a sequece_reference, for which there is a runtime_predicate that holds true -- and then perform an action. If 'visit_where_first' does the above, then I think something like that will be useful -- particulary in my case ;-). I'm looking through the Boost Trunk version of Fusion, but I don't see it in the documentation. I'm willing to try my hand at implementing the above, though it would be great if someone's already done it. :-D

Correct?

Sure sounds like it. :)

Regards, Tobias

Thanks Tobias! -- Dean Michael C. Berris Software Engineer, Friendster, Inc. [http://cplusplus-soup.blogspot.com/] [mikhailberis@gmail.com] [+63 928 7291459] [+1 408 4049523]