Re: memory leak in constructor and during object creation

From:

"Fred Zwarts" <F.Zwarts@KVI.nl>

Newsgroups:

comp.lang.c++

Date:

Mon, 29 Sep 2008 09:53:31 +0200

Message-ID:

<gbq1hs$dq4$1@aioe.org>

"raj s" <yesraaj@gmail.com> wrote in message =
news:a0806fca-5003-4aae-a66d-0d6505aee2e7@8g2000hse.googlegroups.com...

Will the below code cause memory leak in c++

class base{
   int a;
   int *pint;
   someclass objsomeclass;
   someclass* psomeclass;
   base(){
       objsomeclass = someclass();
       psomeclass = new someclass();
       pint = new int();
       throw "constructor failed";
       a = 43;
   }
}
main(){
   base temp();
}

in the above code constructor fails.Which objects will be leaked and
how to avoid memory leak and even if destructor is called for
automatic object is temp and temp pointer will leak the memory?

  main(){
base *temp = base();
}

what about in the above code and how to avoid memory leak when
constructor fails

If you really must use new and if you cannot use a smart pointer type,
than you should handle the exception yourself. E.g.:

    base()
    : pint (0), psomeclass (0)
    {
        try {
            objsomeclass = someclass();
            psomeclass = new someclass();
            pint = new int();
            throw "constructor failed";
            a = 43;
        } catch (...) {
            delete pint;
            delete psomeclass;
            throw;
        }
    }