Re: [boost] Re: MultiArray resizeable

From: nbecker_at_[hidden]
Date: 2002-02-13 11:46:51

>>>>> "Matthias" == Matthias Troyer <troyer_at_[hidden]> writes:

    Matthias> On Wednesday, February 13, 2002, at 01:48 PM, nbecker_at_[hidden] wrote:

    >>>>>>> "garcia" == garcia  <rgarcia1771> writes:
    >> 
    garcia> --- In boost_at_y..., nbecker_at_f... wrote:
    >>>> Default constructed array is then resized to the correct size.
    >> 
    garcia> Could you provide a code example that shows where this 
    >> functionality
    garcia> is needed?  It seems dangerous to have the copy semantics 
    >> of an array
    garcia> depend upon whether or not it was default constructed, not 
    >> to mention
    garcia> whether it had been copied to already or not.
    >> 
    >> I think it is easy to think of examples where the size is not known at
    >> construction time.  For example, an array that is a member of a
    >> class.  Default constructor is used because we don't know the correct
    >> size when the class is constructed.  Later when a class member
    >> function is called, the size is known and the array is resized.
    >> 
    >> I don't know why you say "have the copy semantics of an array depend
    >> upon whether or not it was default constructed..."  Are you saying
    >> that in order to allow resizing that this is a necessary consequence?

    Matthias> If a default-constructed array should be resized, why not just
    Matthias> use operator= and assign an array with the correct dimensions,
    Matthias> once those are known?

I think that would probably be OK.  The doc said you can't resize.  I
didn't know that you could resize by assignment.