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Subject: Re: [boost] Review Request: Creasing (Sequence Properties)
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-01-27 08:43:45

Joachim Faulhaber wrote:
> 2010/1/24 Grant Erickson <gerickson_at_[hidden]>:
> > The creasing algorithm templates define four template functions for
> > determining the order properties of sequences, specifically:
> >
> > * Increasing
> > * Decreasing
> > * Strictly Increasing
> > * Strictly Decreasing
> in your implementation of 'creasing' you provide the four specific
> algorithms is_[strictly_]{in_,de_}creasing while hiding the general
> algorithm is_creasing in namespace detail.
> I'd suggest to implement only the latter. This would make your
> extension both more minimal and more general.

I'd suggest keeping the original function templates but promote is_creasing to first class status. That doesn't fit your "more minimal" criteria, but retains usability for some common cases while retaining full generality.

> Although 'creasing' undoubtedly is a very enjoyable word it violates
> the principle of least astonishment. So I'd prefer 'ordered'.

"creasing" was backformed from "increasing" and "decreasing" and was cute on that basis, but as "creasing" is a word with an unrelated meaning, it certainly won't work for something that isn't an implementation detail. I think "ordered" works nicely.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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