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<title>User data: HarfBuzz Manual</title>
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<a name="object-model-user-data"></a>User data</h2></div></div></div>
<p>
      To better integrate with client programs, HarfBuzz's objects
      offer a "user data" mechanism that can be used to attach
      arbitrary data to the object.  User-data attachment can be
      useful for tying the lifecycles of various pieces of data
      together, or for creating language bindings. 
    </p>
<p>
      Each object type has a <code class="function">set_user_data()</code>
      method and a <code class="function">get_user_data()</code> method. The
      <code class="function">set_user_data()</code> methods take a client-provided
      <code class="literal">key</code> and a pointer,
      <code class="literal">user_data</code>, pointing to the data itself. Once
      the key-data pair has been attached to the object, the
      <code class="function">get_user_data()</code> method can be called with
      the key, returning the <code class="function">user_data</code> pointer.
    </p>
<p>
      The <code class="function">set_user_data()</code> methods also support an
      optional <code class="function">destroy</code> callback. Client programs
      can set the <code class="function">destroy</code> callback and receive
      notification from HarfBuzz whenever the object is destructed.
    </p>
<p>
      Finally, each <code class="function">set_user_data()</code> method allows
      the client program to set a <code class="literal">replace</code> Boolean
      indicating whether or not the function call should replace any
      existing <code class="literal">user_data</code>
      associated with the specified key.
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