boost_1_45_0/libs/variant/doc/reference/static_visitor.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE header PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
  "http://www.boost.org/tools/boostbook/dtd/boostbook.dtd">
<header name="boost/variant/static_visitor.hpp">
  <namespace name="boost">

    <class name="static_visitor">
      <template>
        <template-type-parameter name="ResultType"/>
      </template>

      <purpose>Convenient base type for static visitors.</purpose>
      <description>
        <simpara>Denotes the intent of the deriving class as meeting the
          requirements of a static visitor of some type. Also exposes the
          inner type <code>result_type</code> as required by the
          <link linkend="variant.concepts.static-visitor"><emphasis>StaticVisitor</emphasis></link>
          concept.</simpara>
        <simpara><emphasis role="bold">Notes</emphasis>:
          <code>static_visitor</code> is intended for use as a base type only
          and is therefore noninstantiable.</simpara>
      </description>

      <typedef name="result_type">
        <type>ResultType</type>
        <purpose>Exposes result_type member as required by StaticVisitor concept.</purpose>
      </typedef>
    </class>

  </namespace>
</header>