.. _using-code-templates:

Using Code Templates
--------------------

template
^^^^^^^^

    The template node registers a template that can be used to avoid duplicate
    code when extending the generated code, and it is a child of the typesystem
    node.

    .. code-block:: xml

        <typesystem>
            <template name="my_template">
                // the code
            </template>
        </typesystem>

    Use the insert-template node to insert the template code (identified by the
    template's ``name`` attribute) into the generated code base.


insert-template
^^^^^^^^^^^^^^^

    The insert-template node includes the code template identified by the name
    attribute, and it can be a child of the inject-code, conversion-rule, template,
    custom-constructor and custom-destructor nodes.

    .. code-block:: xml

         <inject-code class="target" position="beginning">
             <insert-template name="my_template" />
         </inject-code>

    Use the replace node to modify the template code.


replace
^^^^^^^

    The replace node allows you to modify template code before inserting it into
    the generated code, and it can be a child of the insert-template node.

    .. code-block:: xml

        <insert-template name="my_template">
           <replace from="..." to="..." />
        </insert-template>

    This node will replace the attribute ``from`` with the value pointed by
    ``to``.