Subject: Re: [boost] [optional] std::tr2::optional
From: Dave Abrahams (dave_at_[hidden])
Date: 2011-11-28 19:05:07
on Fri Nov 18 2011, paul Fultz <pfultz2-AT-yahoo.com> wrote:
>>I provide a list of
>>modifications that I could think of. What is your opinion?
> This is more of an addition to your list, but I think adding
> the | operator for getting the optional value or a default value would be nice.
> For example:
> optional<double> safe_sqrt(double x)
> Â Â Â if (x < 0) return none;
> Â Â Â else return sqrt(x);
> double x = safe_sqrt(4) | 0; //x = 4
> double y = safe_sqrt(-1) | 0; //y = 0
> I dont know if this is possible for tr2, but would be really nice
> addition in the future. Especially, since a lot of times i just
> want a default value if the optional value doesn't exist.
-- Dave Abrahams BoostPro Computing http://www.boostpro.com
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