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From: Jonathan Wakely (cow_at_[hidden])
Date: 2005-05-31 16:06:05

On Tue, May 31, 2005 at 04:12:47PM -0400, christopher diggins wrote:

> From: "Jonathan Turkanis" <technews_at_[hidden]>
> >
> >Are you saying you want boost::array to satisfy the requirements in Table
> >65?
> >
> >I think the postconditions for the expressions "X u" and "X()" will be
> >hard to
> >achieve. ;-)
> Not if the semantics were changed so that size() returned 0 when the array
> was unitialized (which I think would be an improvement). But fine, let's
> say that won't happen until heck freezes over, do you have an opinion on
> the fact that boost array has no constructors simply to support the rather
> obscure syntax of:
> boost::array a = { { 1, 2, 3; } } // notice two sets of { }

IMHO it's one of the key features. To be usable where a C array is,
but with a size() member to avoid range errors.

It is also an intended feature of Austern's block template, which
boost::array is partly inspired by.

The standard is quite clear about what happens if the double braces are
not present, so they are not required, if that's all you're concerned


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