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Subject: Re: [boost] Breaking existing libraries
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2008-11-23 07:21:23

Dave Handley skrev:
> Comments inlined:
> Markus Werle writes:
> <snip>

> I've got one final point to make here. I went through and reviewed the
> code changes in boost.range that Tom is referring to. I wouldn't be
> happy putting this type of code change through in my own libraries.
> Changing the functionality of a default constructed object just to get
> rid of a single test against bool in a couple of functions (ostensibly
> for performance) seems to me misguided.

That is of course a valid view. But take to the extreame, it means we
would have to give up the "you don't pay for what you don't use" mantra.

> Furthermore, having different
> functionality in debug and release, for most major users of a library,
> is just dangerous. The size and empty functions for example assert in
> debug, but just silent fail in release.

"Silently fail" is a bit strong here. I mean, if there are any unit-test
set up, I would expect them to trigger an assert in debug-mode. I don't
consider that "silent".

> The issingular function is even
> worse, it tells you whether a range is singular in debug, but always
> returns false in release.

IIRC, is_singular is not documented. So using it is on your own risk. It
could disappear in the next release or whatever.


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