Re: [boost] Re: Extensible polymorphic pointer

From: Neal D. Becker (nbecker_at_[hidden])
Date: 2002-08-09 13:47:53

>>>>> "Victor" == Victor A Wagner, <vawjr_at_[hidden]> writes:

    Victor> At Wednesday 2002/08/07 14:02, you wrote:
    >> "Philippe A. Bouchard" <philippeb_at_[hidden]> wrote in message
    >> news:airm8o$u3k$1_at_main.gmane.org...
    >> > > More comments:
    >> > >
    >> > > Your code results in undefined behaviour, since it accesses vector
    >> > > elements that have not been constructed.  Even though the data type
    >> > > is POD, accessing vector[i] where i >= vector.size() is not legal C++.
    >> >
    >> > Why is it public then?  There's a flaw in their standards therefore.
    >> 
    >> If I use resize() instead, will it shrink down the allocated block (exactly
    >> what I don't want) if the new size is smaller than the previous one?

    Victor> from all the books I've read, resize() will NOT shrink a vector

Depends what you mean by "shrink".  The resulting vector should report
the new size.  Whether memory is actually freed is a different
question.