Re: [boost] Interest in StaticVector - fixed capacity vector

Subject: Re: [boost] Interest in StaticVector - fixed capacity vector
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-10-12 08:19:11

Olaf van der Spek wrote:
> On Wed, Oct 12, 2011 at 12:38 PM, Stewart, Robert
> <Robert.Stewart_at_[hidden]> wrote:
> >> I'd really like to see the interface be as close to C++11
> >> std::vector as possible (other than vector<bool>).
> >
> > Interface is one thing.  That doesn't address the idea of
> > throwing exceptions when exceeding capacity.  Many wanting to
> > use static_vector in embedded environments don't want
> > exceptions.  The rest of us find them useful.  Still,
> > BOOST_THROW_EXCEPTION provides a means to configure that, but
> > it affects all Boost code; localizing the effect may be
> > desirable.  Matt called for a differently named container as
> > a means to provide the no-exception behavior.  I think a
> > policy class, defaulted to the throwing behavior, is the
> > better approach, despite Jeff's thinking it an unnecessary
> > complication.
>
> Is it a logic error or a runtime error? IMO exceeding the
> capacity here is a logic error and should be handled with an
> assert by default.
> Isn't it comparable to doing a pop_back() on an empty vector?

It depends upon whether static_vector is modeled like std::vector or std::array and whether we're referring to the subscript operator or push_back().  For the subscript operator, it's a logic error in both std::vector and std::array.  For push_back, it's a runtime error (std::bad_alloc) because a vector grows.  std::array doesn't have push_back(), of course, but static_vector manages size and capacity separately, so it will.  Therefore, it isn't a logic error if you follow std::vector's example.

_____
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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