Challenging GotW 66's moral

From:
=?Utf-8?B?R2Vvcmdl?= <George@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.language
Date:
Wed, 26 Dec 2007 22:55:00 -0800
Message-ID:
<02F1051F-A39E-4C72-9482-72F153CC57CF@microsoft.com>
Hello everyone,

In GotW #66, one of the moral is the exception handler of constructor should
not do any like resource free task. I do not agree. Here is the quoated moral
and my code to prove this moral will have memory leak.

Anything wrong with my analysis?

http://www.gotw.ca/gotw/066.htm

Moral #1: Constructor function-try-block handlers have only one purpose --
to translate an exception. (And maybe to do logging or some other side
effects.) They are not useful for any other purpose.

[Code]
class A
{
private:

int* p;

public:

    A()
    try
    {
        p = new int[10];

        // there are some other exceptions here
        
    }
    catch (bad_alloc)
    {
        // do not delete since bad_alloc means memory pointed by p is not
allocated
    }
    catch (...)
    {
        // if we do not delete p, there will be memory leak
        // at this point, we are conflicting with Gotw 66's moral 1
        if (p) delete[] p;
    }
}
[/Code]

thanks in advance,
George

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