svn commit: r359077 - /ant/core/trunk/docs/manual/CoreTasks/presetdef.html

[jglick]

Author: jglick
Date: Mon Dec 26 08:51:31 2005
New Revision: 359077

URL: http://svn.apache.org/viewcvs?rev=359077&view=rev
Log:
Mentioning workaround from #38040 re. eagerly evaluated properties.

Modified:
    ant/core/trunk/docs/manual/CoreTasks/presetdef.html

Modified: ant/core/trunk/docs/manual/CoreTasks/presetdef.html
URL: 
http://svn.apache.org/viewcvs/ant/core/trunk/docs/manual/CoreTasks/presetdef.html?rev=359077&r1=359076&r2=359077&view=diff
==============================================================================
--- ant/core/trunk/docs/manual/CoreTasks/presetdef.html (original)
+++ ant/core/trunk/docs/manual/CoreTasks/presetdef.html Mon Dec 26 08:51:31 2005
@@ -146,6 +146,21 @@
 [showmessage] message is 'Message 2'
 </pre>
      </blockquote>
+<p>
+It is possible to use a trick to evaluate properties when the definition is
+<em>made</em> rather than used. This can be useful if you do not expect some
+properties to be available in child builds run with
+<code>&lt;ant ... inheritall="false"&gt;</code>:
+</p>
+<blockquote><pre class="code">
+&lt;macrodef name="showmessage-presetdef"&gt;
+  &lt;attribute name="messageval"/&gt;
+  &lt;presetdef name="showmessage"&gt;
+    &lt;echo&gt;message is '@{messageval}'&lt;/echo&gt;
+  &lt;/presetdef&gt;
+&lt;/macrodef&gt;
+&lt;showmessage-presetdef messageval="${message}"/&gt;
+</pre></blockquote>
     <hr></hr>
     <p align="center">Copyright &copy; 2003-2005 Apache Software
       Foundation. All rights Reserved.</p>



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