Re: logical (! object) vs (object != nil)
Re: logical (! object) vs (object != nil)
- Subject: Re: logical (! object) vs (object != nil)
- From: Marco Scheurer <email@hidden>
- Date: Tue, 26 Aug 2003 01:33:17 +0200
On Tuesday, August 26, 2003, at 12:46 AM, Alastair J.Houghton wrote:
On Monday, August 25, 2003, at 07:39 pm, Anders Totland wrote:
I have a (C noob) question. Are the two statements (! object) and
(object != nil) the same statement, with identical meaning?
They are expressions and not statements, but yes, they are identical
(since nil is zero).
I know it's a typo but as written, they are the opposite of each other.
In practice, (!object) and (object == nil) are the same, and which one
you use is a matter of style and preferences.
See "Is the abbreviated pointer comparison 'if(p)' to test for non-null
pointers valid? What if the internal representation for null pointers
is nonzero?" at
http://www.eskimo.com/~scs/C-faq/q5.3.html
Marco Scheurer
Sen:te, Lausanne, Switzerland
http://www.sente.ch
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