Re: to const or not to const
* Balog Pal:
"Alf P. Steinbach" <alfps@start.no>
This method is very interesting. In a single-threaded program it
should clearly not be the basic interface but just a convenience
wrapper around 'top' and 'remove_top', because the copying of
value_type may throw after altering the fifo state, preventing sound
exception guarantee.
Interesting that this pop/top 'problem' is mentioned so much. In
practice I can't recall a single case -- the stuff I held in queues and
stacks just never had a throwing ctor. It was either some simple POD or
the equivalent of the unique_ptr. Even for single threaded stuff, but in
MT definitely the latter.
I do not want a fat copy inside a critical section. Let alone one that
calls system functions for memory and/or may throw.
Yah, the practical solution may just be to require non-throwing copying for the
items.
Anyway, I feel utterly stupid.
I'm looking at <url:
http://code.google.com/codejam/contest/dashboard?c 4113#s=a&a=2>, and they
say, "Behold, the Aha moment ..." -- and there's no Aha in my brain at all.
I'm assuming those colored lines are meant to be directional, after all it's a DAG.
But DAnG!
Cheers,
- Alf
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