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Subject: Re: [boost] Interest in StaticVector - fixed capacity vector
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-10-13 07:02:41

Nathan Ridge wrote:
> > > And sometimes is less efficient. For instance, if you are
> > > populating from StaticVector from list iterators (or any
> > > non-random access iterators), it's an O(n) check ahead of
> > > time or a complicated wrapper around a one-at-a-time
> > > insert. (Note: this is a bug in the current implementation
> > > of StaticVector, as its iterator constructor currently
> > > requires random access iterators).
> > >
> > I assume I want to simply check the distance between two
> > random access iterators and return immediately if the size is
> > too big. Then, if it isn't random access I should just start
> > copying and check if I've run out of space on each element
> > that is added. Is this correct?
> Basically, yes. You may also want to have a version for
> forward iterators - if you're allowed to traverse the range
> more than once, then it is usually more efficient to traverse
> it once to find out the length, throw (or whatever) if the
> length is too big, and otherwise traverse it a second time to
> actually insert the elements. (This is not always more
> efficient - for example, if your iterators are
> transform_iterators, and the transformation function they are
> calling is expensive, it's not - but I believe several STL
> implementations assume it is and do it this way).

Why would you optimize the failure case?

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


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