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<!DOCTYPE html><html><head>
<title>oo::util - Utility commands for TclOO</title>
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<div class="doctools">
<h1 class="doctools_title">oo::util(n) 1.2.2 tcllib "Utility commands for TclOO"</h1>
<div id="name" class="doctools_section"><h2><a name="name">Name</a></h2>
<p>oo::util - Utility commands for TclOO</p>
</div>
<div id="toc" class="doctools_section"><h2><a name="toc">Table Of Contents</a></h2>
<ul class="doctools_toc">
<li class="doctools_section"><a href="#toc">Table Of Contents</a></li>
<li class="doctools_section"><a href="#synopsis">Synopsis</a></li>
<li class="doctools_section"><a href="#section1">Description</a></li>
<li class="doctools_section"><a href="#section2">COMMANDS</a></li>
<li class="doctools_section"><a href="#section3">AUTHORS</a></li>
<li class="doctools_section"><a href="#section4">Bugs, Ideas, Feedback</a></li>
<li class="doctools_section"><a href="#see-also">See Also</a></li>
<li class="doctools_section"><a href="#keywords">Keywords</a></li>
<li class="doctools_section"><a href="#category">Category</a></li>
<li class="doctools_section"><a href="#copyright">Copyright</a></li>
</ul>
</div>
<div id="synopsis" class="doctools_section"><h2><a name="synopsis">Synopsis</a></h2>
<div class="doctools_synopsis">
<ul class="doctools_requirements">
<li>package require <b class="pkgname">Tcl 8.5</b></li>
<li>package require <b class="pkgname">TclOO</b></li>
<li>package require <b class="pkgname">oo::util <span class="opt">?1.2.2?</span></b></li>
</ul>
<ul class="doctools_syntax">
<li><a href="#1"><b class="cmd">mymethod</b> <i class="arg">method</i> <span class="opt">?<i class="arg">arg</i>...?</span></a></li>
<li><a href="#2"><b class="cmd">classmethod</b> <i class="arg">name</i> <i class="arg">arguments</i> <i class="arg">body</i></a></li>
<li><a href="#3"><b class="cmd">classvariable</b> <span class="opt">?<i class="arg">arg</i>...?</span></a></li>
<li><a href="#4"><b class="cmd">link</b> <i class="arg">method</i>...</a></li>
<li><a href="#5"><b class="cmd">link</b> {<i class="arg">alias</i> <i class="arg">method</i>}...</a></li>
<li><a href="#6"><b class="cmd">ooutil::singleton</b> <span class="opt">?<i class="arg">arg</i>...?</span></a></li>
</ul>
</div>
</div>
<div id="section1" class="doctools_section"><h2><a name="section1">Description</a></h2>
<p>This package provides a convenience command for the easy specification
of instance methods as callback commands, like timers, file events, Tk
bindings, etc.</p>
</div>
<div id="section2" class="doctools_section"><h2><a name="section2">COMMANDS</a></h2>
<dl class="doctools_definitions">
<dt><a name="1"><b class="cmd">mymethod</b> <i class="arg">method</i> <span class="opt">?<i class="arg">arg</i>...?</span></a></dt>
<dd><p>This command is available within instance methods. It takes a method
name and, possibly, arguments for the method and returns a command
prefix which, when executed, will invoke the named method of the
object we are in, with the provided arguments, and any others supplied
at the time of actual invokation.</p>
<p>Note: The command is equivalent to and named after the command
provided by the OO package <b class="package"><a href="../snit/snit.html">snit</a></b> for the same purpose.</p></dd>
<dt><a name="2"><b class="cmd">classmethod</b> <i class="arg">name</i> <i class="arg">arguments</i> <i class="arg">body</i></a></dt>
<dd><p>This command is available within class definitions. It takes a method
name and, possibly, arguments for the method and creates a method on the
class, available to a user of the class and of derived classes.</p>
<p>Note: The command is equivalent to the command <b class="cmd">typemethod</b>
provided by the OO package <b class="package"><a href="../snit/snit.html">snit</a></b> for the same purpose.</p>
<p>Example</p>
<pre class="doctools_example">
oo::class create ActiveRecord {
classmethod find args { puts "[self] called with arguments: $args" }
}
oo::class create Table {
superclass ActiveRecord
}
puts [Table find foo bar]
# ======
# which will write
# ======
# ::Table called with arguments: foo bar
</pre>
</dd>
<dt><a name="3"><b class="cmd">classvariable</b> <span class="opt">?<i class="arg">arg</i>...?</span></a></dt>
<dd><p>This command is available within instance methods. It takes a series
of variable names and makes them available in the method's scope. The
originating scope for the variables is the class (instance) the object
instance belongs to. In other words, the referenced variables are shared
between all instances of their class.</p>
<p>Note: The command is roughly equivalent to the command
<b class="cmd">typevariable</b> provided by the OO package <b class="package"><a href="../snit/snit.html">snit</a></b> for the
same purpose. The difference is that it cannot be used in the class
definition itself.</p>
<p>Example:</p>
<pre class="doctools_example">
% oo::class create Foo {
method bar {z} {
classvariable x y
return [incr x $z],[incr y]
}
}
::Foo
% Foo create a
::a
% Foo create b
::b
% a bar 2
2,1
% a bar 3
5,2
% b bar 7
12,3
% b bar -1
11,4
% a bar 0
11,5
</pre>
</dd>
<dt><a name="4"><b class="cmd">link</b> <i class="arg">method</i>...</a></dt>
<dd></dd>
<dt><a name="5"><b class="cmd">link</b> {<i class="arg">alias</i> <i class="arg">method</i>}...</a></dt>
<dd><p>This command is available within instance methods. It takes a list of
method names and/or pairs of alias- and method-name and makes the
named methods available to all instance methods without requiring the
<b class="cmd">my</b> command.</p>
<p>The alias name under which the method becomes available defaults
to the method name, except where explicitly specified through an
alias/method pair.</p>
<p>Examples:</p>
<pre class="doctools_example">
link foo
# The method foo is now directly accessible as foo instead of my foo.
link {bar foo}
# The method foo is now directly accessible as bar.
link a b c
# The methods a, b, and c all become directly acessible under their
# own names.
</pre>
<p>The main use of this command is expected to be in instance constructors,
for convenience, or to set up some methods for use in a mini DSL.</p></dd>
<dt><a name="6"><b class="cmd">ooutil::singleton</b> <span class="opt">?<i class="arg">arg</i>...?</span></a></dt>
<dd><p>This command is a meta-class, i.e. a variant of the builtin
<b class="cmd">oo::class</b> which ensures that it creates only a single
instance of the classes defined with it.</p>
<p>Syntax and results are like for <b class="cmd">oo::class</b>.</p>
<p>Example:</p>
<pre class="doctools_example">
% oo::class create example {
self mixin singleton
method foo {} {self}
}
::example
% [example new] foo
::oo::Obj22
% [example new] foo
::oo::Obj22
</pre>
</dd>
</dl>
</div>
<div id="section3" class="doctools_section"><h2><a name="section3">AUTHORS</a></h2>
<p>Donal Fellows, Andreas Kupries</p>
</div>
<div id="section4" class="doctools_section"><h2><a name="section4">Bugs, Ideas, Feedback</a></h2>
<p>This document, and the package it describes, will undoubtedly contain
bugs and other problems.
Please report such in the category <em>oo::util</em> of the
<a href="http://core.tcl.tk/tcllib/reportlist">Tcllib Trackers</a>.
Please also report any ideas for enhancements you may have for either
package and/or documentation.</p>
<p>When proposing code changes, please provide <em>unified diffs</em>,
i.e the output of <b class="const">diff -u</b>.</p>
<p>Note further that <em>attachments</em> are strongly preferred over
inlined patches. Attachments can be made by going to the <b class="const">Edit</b>
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar.</p>
</div>
<div id="see-also" class="doctools_section"><h2><a name="see-also">See Also</a></h2>
<p><a href="../snit/snit.html">snit(n)</a></p>
</div>
<div id="keywords" class="doctools_section"><h2><a name="keywords">Keywords</a></h2>
<p><a href="../../../../index.html#tcloo">TclOO</a>, <a href="../../../../index.html#callback">callback</a>, <a href="../../../../index.html#class_methods">class methods</a>, <a href="../../../../index.html#class_variables">class variables</a>, <a href="../../../../index.html#command_prefix">command prefix</a>, <a href="../../../../index.html#currying">currying</a>, <a href="../../../../index.html#method_reference">method reference</a>, <a href="../../../../index.html#my_method">my method</a>, <a href="../../../../index.html#singleton">singleton</a></p>
</div>
<div id="category" class="doctools_section"><h2><a name="category">Category</a></h2>
<p>Utility</p>
</div>
<div id="copyright" class="doctools_section"><h2><a name="copyright">Copyright</a></h2>
<p>Copyright © 2011-2015 Andreas Kupries, BSD licensed</p>
</div>
</div></body></html>
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