Re: Testing for equality

From:
"Bo Persson" <bop@gmb.dk>
Newsgroups:
comp.lang.c++
Date:
Wed, 2 Apr 2008 19:31:41 +0200
Message-ID:
<65hu75F2g60v7U1@mid.individual.net>
Brian Tyler wrote:

Even if you can estimate how many times this
might happen, you'd still be better off actually measuring instead
of guessing (or "estimating" for picky folk).
To me it's a simple arithmetic combined with probability.

V


Yes, you are completely right, there are going to be cases where
this check might pay off, but that totally depends how the objects
are used. In my case I don't see why the situation of a == b and &a
== &b would occur, so it is totally pointless.

I'm a mathematician and no one in my department is a programmer, so
sometimes I do something odd once (with some kind of justification)
and then I get into the habit because there is no one to challenge
me. I've been writing C++ (maybe that should be rewriting!) a lot
for the past year or so, but this is a very subtle and complex
language. Thanks for giving me a little perspective.


This is typically a case where you would write the simplest possible
code at first, and only when you application runs really slow would go
back and add this optimization later, when you know it's needed.

Most often, it won't be!

Bo Persson

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