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Next: <a href="Object-Persistence.html" accesskey="n" rel="next">Object Persistence</a>, Previous: <a href="Variable-Declaration.html" accesskey="p" rel="prev">Variable Declaration</a>, Up: <a href="index.html" accesskey="u" rel="up">Top</a> &nbsp; </p>
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<span id="Naming-Conventions-1"></span><h2 class="chapter">8 Naming Conventions</h2>

<p>The convention for naming items in GNUstep differs from the GNU standard
as it needs to be compatible with OpenStep/MacOS-X.
</p>
<p>Public classes, variables, functions and constants begin with the NS prefix
if they are part of the OpenStep or MacOS-X APIs, and begin with GS if they
are GNUstep extensions.  GNUstep extensions must not use the NS prefix.
</p>
<p>Class, public function, and global variable names have the first letter of
each word in the name capitalised (underscores are not used).
</p><div class="example">
<pre class="example">@class	NSRunLoop;
GSSetUserName();
NSGenericException;
</pre></div>

<p>Method and instance variable names are similarly capitalised, except that the
first letter of the first word is usually not capitalised (there are a few
exceptions to this where the first word is an acronym and all the letters
in it are capitals).  Underscores are not used in these names except to indicate that the method/variable is private, in which case the name begins with an
underscore.
</p>
<div class="example">
<pre class="example">{
  int	publicInstanceVariable;
  int	_privateInstanceVariable;
}
- (void) publicMethod;
- (void) _privateMethod;
</pre></div>

<p>The names of accessor methods (methods used to set or get the value of an
instance variable) must mirror the names of the instance variables.
The name of a setter method is of the form &rsquo;setVar&rsquo; where &rsquo;Var&rsquo; is the
instance variable name with any leading underscore removed and with the
first letter converted to uppercase.
The name of the getter method is the same as the instance variable name
(with any leading underscore removed).
</p>
<div class="example">
<pre class="example">{
  int	_amplitude;
  int	frequency;
}
- (int) amplitude;
- (int) frequency;
- (void) setAmplitude: (int)anAmplitude;
- (void) setFrequencey: (int)aFrequency;
</pre></div>




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