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    <h2><a name="macrodef">MacroDef</a></h2>
    <h3>Description</h3>
    <p>
      This defines a new task using a &lt;sequential&gt; 
      nested task as a template. Nested elements &lt;attribute&gt; and
      &lt;element&gt; are used to specify attributes and elements of
      the new task. These get substituted into the  &lt;sequential&gt;
      task when the new task is run.
    </p>
    <p>
      <em>since Ant 1.6</em>
    </p>
    <h3>Parameters</h3>
    <table border="1" cellpadding="2" cellspacing="0">
      <tr>
        <td valign="top"><b>Attribute</b></td>
        <td valign="top"><b>Description</b></td>
        <td align="center" valign="top"><b>Required</b></td>
      </tr>
      <tr>
        <td valign="top">name</td>
        <td valign="top">The name of the new definition</td>
        <td valign="top" align="center">Yes</td>
      </tr>
      <tr>
        <td valign="top">uri</td>
        <td valign="top">
          The uri that this definition should live in.
        </td>
        <td valign="top" align="center">No</td>
      </tr>
    </table>
      <h3>Parameters specified as nested elements</h3>
    <h4>attribute</h4>
    <p>
      This is used to specify attributes of the new task. The values
      of the attributes get substituted into the templated task.
      The attributes will be required attributes unless a default
      value has been set.
    </p>
    <p>
      This attribute is placed in the body of the templated
      task using a notation similar to the ant property notation
      - @{attribute name}. (May be remembered as "put the substitution
      AT this location").
      The escape sequence @@{x} is used to allow @{x} to be
      placed in the text without substitution of x.
      This corresponds to the $${x} escape sequence for properties
    </p>
    <h3>Parameters</h3>
    <table border="1" cellpadding="2" cellspacing="0">
      <tr>
        <td valign="top"><b>Attribute</b></td>
        <td valign="top"><b>Description</b></td>
        <td align="center" valign="top"><b>Required</b></td>
      </tr>
      <tr>
        <td valign="top">name</td>
        <td valign="top">The name of the new attribute</td>
        <td valign="top" align="center">Yes</td>
      </tr>
      <tr>
        <td valign="top">default</td>
        <td valign="top">
          The default value of the attribute.
        </td>
        <td valign="top" align="center">No</td>
      </tr>
    </table>
    <h4>element</h4>
    <p>
      This is used to specify nested elements of the new task.
      The contents of the nested elements of the task instance
      are placed in the templated task at the tag name.
    </p>
    <h3>Parameters</h3>
    <table border="1" cellpadding="2" cellspacing="0">
      <tr>
        <td valign="top"><b>Attribute</b></td>
        <td valign="top"><b>Description</b></td>
        <td align="center" valign="top"><b>Required</b></td>
      </tr>
      <tr>
        <td valign="top">name</td>
        <td valign="top">The name of the new attribute</td>
        <td valign="top" align="center">Yes</td>
      </tr>
      <tr>
        <td valign="top">optional</td>
        <td valign="top">
          If true this nested element is optional. Default is
          false - i.e the nested element is required in
          the new task.
        </td>
        <td valign="top" align="center">No</td>
      </tr>
    </table>
    
    <h3>Examples</h3>
    <p>
      The following example defined a task called testing and
      runs it.
    </p>
    <blockquote>
<pre class=code>
&lt;macrodef name="testing"&gt;
   &lt;attribute name="v" default="NOT SET"/&gt;
   &lt;element name="some-tasks" optional="yes"/&gt;
   &lt;sequential&gt;
      &lt;echo&gt;v is @{v}&lt;/echo&gt;
      &lt;some-tasks/&gt;
   &lt;/sequential&gt;
&lt;/macrodef&gt;

&lt;testing v="This is v"&gt;
   &lt;some-tasks&gt;
      &lt;echo&gt;this is a test&lt;/echo&gt;
   &lt;/some-tasks&gt;
&lt;/testing&gt;
</pre>
    </blockquote>
    <p>
      The following fragment defines a task called &lt;call-cc&gt; which
      take the attributes "target", "link" and "target.dir" and the
      nested element "cc-elements". The body of the task
      uses the &lt;cc&gt; task from the
      <a href="http://ant-contrib.sourceforge.net/">ant-contrib</a> project.
    </p>
    <blockquote>
<pre class="code">
&lt;macrodef name="call-cc"&gt;
   &lt;attribute name="target"/&gt;
   &lt;attribute name="link"/&gt;
   &lt;attribute name="target.dir"/&gt;
   &lt;element name="cc-elements"/&gt;
   &lt;sequential&gt;
      &lt;mkdir dir="${obj.dir}/@{target}"/&gt;
      &lt;mkdir dir="@{target.dir}"/&gt;
         &lt;cc link="@{link}" objdir="${obj.dir}/@{target}"
             outfile="@{target.dir}/@{target}"&gt;
            &lt;compiler refid="compiler.options"/&gt;
            &lt;cc-elements/&gt;
         &lt;/cc&gt;
      &lt;/sequential&gt;
&lt;/macrodef&gt;
</pre>
    </blockquote>
    <p>
      This then can be used as follows:
    </p>
    <blockquote>
<pre class="code">
&lt;call-cc target="unittests" link="executable"
         target.dir="${build.bin.dir}"&gt;
   &lt;cc-elements&gt;
      &lt;includepath location="${gen.dir}"/&gt;
      &lt;includepath location="test"/&gt;
      &lt;fileset dir="test/unittest" includes = "**/*.cpp"/&gt;
      &lt;fileset dir="${gen.dir}" includes = "*.cpp"/&gt;
      &lt;linker refid="linker-libs"/&gt;
   &lt;/cc-elements&gt;
&lt;/call-cc&gt;
</pre>
    </blockquote>
<hr>
<p align="center">Copyright &copy; 2003 Apache Software
Foundation. All rights Reserved.</p>

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