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<ppdoc>
<copyright>
Copyright (c) 2001 by Addison Wesley Longman. This
material may be distributed only subject to the terms and
conditions set forth in the Open Publication License, v1.0 or
later (the latest version is presently available at
http://www.opencontent.org/openpub/).
</copyright>
<class name="Method" super="Object" type="class">
Method objects are created by <cim><file>object</file><front>Object</front><back>method</back><mref>method</mref></cim>, and are associated
with a particular object (not just with a class). They may be used
to invoke the method within the object, and as a block associated with
an iterator.
<p/>
<codefragment>
<fullcode><![CDATA[ class Thing
def square(n)
n*n
end
end
aThing = Thing.new
aMethod = aThing.method("square")
aMethod.call(9)
[ 1, 2, 3 ].collect(&aMethod)
]]></fullcode><rubycode>
<tr>
<td colspan="3"><tt>class<nbsp/>Thing</tt></td>
</tr>
<tr>
<td colspan="3"><tt><nbsp/><nbsp/>def<nbsp/>square(n)</tt></td>
</tr>
<tr>
<td colspan="3"><tt><nbsp/><nbsp/><nbsp/><nbsp/>n*n</tt></td>
</tr>
<tr>
<td colspan="3"><tt><nbsp/><nbsp/>end</tt></td>
</tr>
<tr>
<td colspan="3"><tt>end</tt></td>
</tr>
<tr>
<td colspan="3"><tt>aThing<nbsp/><nbsp/>=<nbsp/>Thing.new</tt></td>
</tr>
<tr>
<td colspan="3"><tt>aMethod<nbsp/>=<nbsp/>aThing.method("square")</tt></td>
</tr>
<tr>
<td colspan="3"><tt></tt></td>
</tr>
<tr>
<td><tt>aMethod.call(9)</tt></td>
<td>»</td>
<td><tt>81</tt></td>
</tr>
<tr>
<td><tt>[<nbsp/>1,<nbsp/>2,<nbsp/>3<nbsp/>].collect(&aMethod)</tt></td>
<td>»</td>
<td><tt>[1,<nbsp/>4,<nbsp/>9]</tt></td>
</tr>
</rubycode>
<p/>
</codefragment>
<p/>
<methods type="instance">
<method name="[ ]" ref="_ob_cb">
<callseq>
<obj>meth</obj>[ <optz><obj>args</obj></optz> ]
<returns><obj>anObject</obj></returns>
</callseq>
<desc>
<p/>
Synonym for <tt>Method.call</tt>.
<p/>
</desc>
</method>
<p/>
<method name="arity" ref="arity">
<callseq>
<obj>meth</obj>.arity <returns><obj>aFixnum</obj></returns>
</callseq>
<desc>
<p/>
Returns an indication of the number of arguments accepted by a method.
Returns a nonnegative integer for methods that take a fixed number
of arguments. For Ruby methods that take a variable number of
arguments, returns -n-1, where n is the number of required
arguments. For methods written in C, returns -1 if the call
takes a variable number of arguments.
<p/>
</desc>
</method>
<p/>
<method name="call" ref="call">
<callseq>
<obj>meth</obj>.call( <optz><obj>args</obj></optz> )
<returns><obj>anObject</obj></returns>
</callseq>
<desc>
<p/>
Invokes the <obj>meth</obj> with the specified
arguments, returning the method's return value.
<p/>
<codefragment>
<fullcode><![CDATA[ m = 12.method("+")
m.call(3)
m.call(20)
]]></fullcode><rubycode>
<tr>
<td colspan="3"><tt>m<nbsp/>=<nbsp/>12.method("+")</tt></td>
</tr>
<tr>
<td><tt>m.call(3)</tt></td>
<td>»</td>
<td><tt>15</tt></td>
</tr>
<tr>
<td><tt>m.call(20)</tt></td>
<td>»</td>
<td><tt>32</tt></td>
</tr>
</rubycode>
<p/>
</codefragment>
<p/>
</desc>
</method>
<p/>
<method name="to_proc" ref="to_proc">
<callseq>
<obj>meth</obj>.to_proc <returns><obj>aProc</obj></returns>
</callseq>
<desc>
<p/>
Returns a <classname>Proc</classname> object corresponding to this method.
<p/>
</desc>
</method>
<p/>
</methods>
<p/>
</class>
</ppdoc>
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