Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!csn!pikes!mercury.cair.du.edu!diana.cair.du.edu!ttoupin
From: ttoupin@diana.cair.du.edu (Aerin)
Newsgroups: comp.lang.c++
Subject: Re: Overloading new and delete
Keywords: new,delete,overloading
Message-ID: <1991Jun11.044126.6617@mercury.cair.du.edu>
Date: 11 Jun 91 04:41:26 GMT
References: <10961@rama.UUCP>
Sender: news@mercury.cair.du.edu (netnews)
Organization: University of Denver
Lines: 48

In article <10961@rama.UUCP> Lyndon VanWagner writes:
>According to pg. 164, and 262-266 of C++ Primer by
>Stanley B. Lippman, one can overload the new and delete operators.
>I have heard some references on the net about doing this in C++ 2.0+ .
>Were these just rumors, or can we still do this?

Cf. E&S, pp. 282-4.  Paraphrasing: operators new and delete can be overloaded.
With operator new, one must specify have at least one argument

	void *operator new(size_t __size

Other arguments must be specified, but an operator new must exist which takes
one argument of type size_t.  For example:

	void *operator new(size_t __size,void *__arena =NULL)

might allocate space in a specified arena (if specified, like

	Arena=get_arena_address_from_someone_in_charge();
	Thing *ptr=new (Arena) Thing;

), or in global memory with no arena specified.  The delete operator takes one
argument (a void *), or optionally a second argument of type size_t giving the
size of the object being deleted.  See ARM for more complete info.

>--Lyndon VanWagner
>-- 
>-----------------------------------------------------------------------------
>Lyndon C. VanWagner		Internet:lvw@rama.sc.harris.com
>Software Engineer		-or-	rama!lvw@uu.psi.com
>Framework Development Group	UUCP:	...!{uupsi,tropix}!rama!lvw
>Harris Corporation		PHONE:	(716) 924-9303 ext. 226
>Scientific Calculations Division, Fishers, NY 14453
>-----------------------------------------------------------------------------
>Cornfield's Law (paraphrased):
>	Before anything can change, everyone must agree.
>	By the time that happens its a different problem.
>-----------------------------------------------------------------------------

--
Tory S. Toupin                         |
ttoupin@diana.cair.du.edu              |  Existence toward perfection...
Unversity of Denver                    |      Life of mediocrity!
Undergraduate: Math & Computer Sciences|
Denver, CO  80208                      |         - M. E.

-----
Ceci n'est pas une signature.