Re: private construction on GCC

From:
"Kaz Kylheku" <kkylheku@gmail.com>
Newsgroups:
comp.lang.c++
Date:
24 Jul 2006 16:12:48 -0700
Message-ID:
<1153782767.954377.294270@p79g2000cwp.googlegroups.com>
brianhray@gmail.com wrote:

     void Release() {
           if (count > 0) count--; //< Exception Here
           if (count <= 0) {
              delete this;
            }
    }

That is incredibly stupid coding. If the count is zero on entry into
the Release() function, that is an error. So the logic is basically:

   if (there isn't a software defect here from a mismanaged refcount)
    decrement the refcount

   if (the refcount is now zero, or it has been mismanaged)
    blow away the object

In other words if there is an error situation, the logic compounds it
by trying to delete the object, something which already happened.

If you aren't going to handle an error situation in a meaningful way,
and if you aren't going to at least report it in an error log, then
don't test for it! Just write:

  void Release()
  {
    if (--count == 0)
      delete this;
  }

     // attribute functions
    long Count() const { return count; }

If any part of the program, other than the Grab() and Release()
functions, cares what the absolute reference count is, you are probably
doing something wrong.

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