Re: [boost] [Review:Algorithms] Order of args to clamp

Subject: Re: [boost] [Review:Algorithms] Order of args to clamp
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-09-26 14:19:48

Christian Holmquist wrote:
>
> Why is the result type the first argument, since any of the
> three may be returned?
>
> Why is that clear for clamp?
> clamp(T x, Low lo, High hi)
> if (x < lo)
>   return lo;
>             ^---------- doesn't return T.

Sure it does, if the return type is T.

> else if (!(x < hi))
>   return hi;
>             ^---------- doesn't return T.

Ditto.

> else
>   return x;

There can be only one return type.  As currently specified, the return type is that of the value being checked: the first argument.  The only question is whether to allow the limits to have different types.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer                     using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP  http://www.sig.com

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