Article View: comp.std.c++
Article #2631Deleting Pointers To Const
From: Alexander J. Oss
Date: Fri, 17 Nov 1995 16:41
Date: Fri, 17 Nov 1995 16:41
33 lines
1534 bytes
1534 bytes
I've looked in sections 3.7.3.2 and 5.3.5 of the April 28th draft and didn't
see anything concerning the deletion of pointers to const (except that you
shouldn't use already-deallocated modifiable lvalues).
I get an error saying "Cannot convert 'const int *' to 'void *' in function
Holder<int>::~Holder()" using TC++ 4.5 for the following code:
template <class T>
class Holder
{
const T *object;
public:
Holder(const T *src) { object = src; }
virtual ~Holder(); { delete object; }
};
int main()
{
Holder<int> h(new int(5));
return(0);
}
When I change the destructor to
virtual ~Holder(); { delete const_cast<T *>(object) }
all is well! Why is that?
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Path: arc1-ca.pugleaf.net!engnews1.Eng.Sun.COM!taumet!clamage From: "Alexander J. Oss" <alex.oss@films.com> Newsgroups: comp.std.c++ Subject: Deleting Pointers To Const Date: 17 Nov 1995 16:41:29 GMT Organization: PSI Public Usenet Link Approved: clamage@eng.sun.com (comp.std.c++) Message-ID: <NEWTNews.816616683.26228.alex@alexpc.films.com> NNTP-Posting-Host: taumet.eng.sun.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset="US-ASCII" X-Nntp-Posting-Host: alexpc.films.com X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage X-Lines: 29 Content-Length: 669 Originator: clamage@taumet