Subject: Re: [boost] [optional] std::tr2::optional
From: Robert Ramey (ramey_at_[hidden])
Date: 2011-11-28 23:51:01
Matt Chambers wrote:
> On 11/28/2011 6:05 PM, Dave Abrahams wrote:
>> 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)
>>> if (x< 0) return none;
>>> 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.
since we're all chiming in - I hate ideas like this. Silently giving
a seemingly valid answer to an invalid question just hides a bug
and makes it harder to find. It's a big source of problems with
much component type software.
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