From -642021968341648771
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: f78e5,839fa42e97baea86
X-Google-Attributes: gidf78e5,public
From: Gabriel Netterdag <netterdag@hotmail.com>
Subject: Re: Placement new[] Compiler Depenent?
Date: 1998/11/20
Message-ID: <3655EC63.A223BF35@hotmail.com>#1/1
X-Deja-AN: 414018714
X-NNTP-Posting-Host: sdu213-76.ppp.algonet.se
Content-Transfer-Encoding: 7bit
Approved: stephen.clamage@sun.com (comp.std.c++)
References: <eDcSHHgdulIC-pn2-e3Hcgbrpl1Vl@eir.stiscan.com> <72v90t$9uq$1@engnews2.Eng.Sun.COM> <36535E69.CB09EC8B@prolifics.com>
X-UID: 0000000001
X-Status: $$$T
Content-Type: text/plain; charset=us-ascii
Organization: Algonet/Tninet
Mime-Version: 1.0
NNTP-Posting-Date: 20 Nov 1998 22:20:43 GMT
Newsgroups: comp.std.c++
Originator: clamage@taumet


Hyman Rosen wrote:
> 
> Really? How about this?
> 
> struct sizer { };
> void *operator new[](size_t b, const sizer &) { throw b; }
> 
> template<typename T>
> size_t
> size(size_t n)
> {
>         sizer s;
>         try {
>                 new(s) T[n];
>         } catch (size_t b) {
>                 return b;
>         }
> }

This is a nice idea. There is just one little subtle point
in the Standard that states that the amount of overhead
may vary from one invocation of new to another (5.3.4/12).
I doubt that any reasonable implementation would do this,
but the wording is still there.

Regards
//Gabriel



[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]