NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part1/2946

Text File | 1996-08-06 | 1.2 KB | 52 lines

Path: alpnet76.alpes-net.fr!utilisateur
From: [e-mail] (Nicolas Monnet)
Newsgroups: comp.lang.c++
Subject: [Q] new-allocated objects within try block
Date: Sat, 20 Jan 1996 21:47:21 +0100
Organization: Ensieg/I.N.P.G.
Message-ID: <[e-mail]>
NNTP-Posting-Host: alpnet76.alpes-net.fr

Here's the problem I'm facing -- it's probably a bad approach, it's even
possibly answered in some faq but...

I need to allocate an object with new, and delete it in the same block,
as if it was allocated on the stack.
Why? Well, I'm using an abstract base class, and I have different descendents,
and, of course, I create one of them. Example:

class ABC { public: virtual void DoSomething() = 0; };
class A : public ABC { public: virtual void DoSomething(); };
class B : public ABC { public: virtual void DoSomething(); };

(...)
try {
   ABC *p;
   if (test) {
     ..
     p = new A;
   } else {
      ...
      p = new B;
   }
   ...
   throw sthg;
   ...
   p->DoSomething();
   delete p;
} catch (...) {

}

Then, *p is not properly destroyed, isn't it?

What is another way of doing it?



Thanks in advance!

----
Nicolas Monnet
[e-mail]