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<title>Macro BOOST_PROTO_LOCAL_ITERATE</title>
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<div class="refentry" title="Macro BOOST_PROTO_LOCAL_ITERATE">
<a name="BOOST_PROTO_LOCAL_ITERATE"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Macro BOOST_PROTO_LOCAL_ITERATE</span></h2>
<p>BOOST_PROTO_LOCAL_ITERATE &#8212; Vertical repetition of a user-supplied macro.</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: &lt;<a class="link" href="proto/reference.html#header.boost.proto.repeat_hpp" title="Header &lt;boost/proto/repeat.hpp&gt;">boost/proto/repeat.hpp</a>&gt;

</em></span>BOOST_PROTO_LOCAL_ITERATE()</pre></div>
<div class="refsect1" title="Description">
<a name="id1630976"></a><h2>Description</h2>
<p>
        <code class="computeroutput">BOOST_PROTO_LOCAL_ITERATE()</code> is used generate the kind of repetitive code that is typical
        of DSELs built with Proto. This macro causes the user-defined macro <code class="computeroutput">BOOST_PROTO_LOCAL_MACRO()</code> to
        be expanded with values in the range specified by <code class="computeroutput">BOOST_PROTO_LOCAL_LIMITS</code>.
      </p>
<p>
        <span class="bold"><strong>Usage:</strong></span>
      </p>
<p>
        </p>
<pre class="programlisting">#include BOOST_PROTO_LOCAL_ITERATE()</pre>
<p>
      </p>
<p>
        <span class="bold"><strong>Example:</strong></span>
      </p>
<p>
        </p>
<pre class="programlisting">// Generate BOOST_PROTO_MAX_ARITY-1 overloads of the
// following construct() function template.
#define BOOST_PROTO_LOCAL_MACRO(N, typename_A, A_const_ref, A_const_ref_a, ref_a)\
template&lt;typename T, typename_A(N)&gt;                               \
typename <a class="link" href="boost/proto/result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a>&lt;                             \
    <a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>                                          \
  , construct_helper&lt;T&gt;                                           \
  , A_const_ref(N)                                                \
&gt;::type const                                                     \
construct(A_const_ref_a(N))                                       \
{                                                                 \
    return <a class="link" href="boost/proto/make_expr_id1241909.html" title="Function make_expr">proto::make_expr</a>&lt;                                      \
        <a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>                                      \
    &gt;(                                                            \
        construct_helper&lt;T&gt;()                                     \
      , ref_a(N)                                                  \
    );                                                            \
}
#define BOOST_PROTO_LOCAL_LIMITS (1, BOOST_PP_DEC(BOOST_PROTO_MAX_ARITY))
#include BOOST_PROTO_LOCAL_ITERATE()</pre>
<p>
      </p>
<p>
        The above inclusion of <code class="computeroutput">BOOST_PROTO_LOCAL_ITERATE()</code>
        will generate the following code:
      </p>
<p>
        </p>
<pre class="programlisting">template&lt;typename T, typename A0&gt;
typename <a class="link" href="boost/proto/result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a>&lt;
    <a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
  , construct_helper&lt;T&gt;
  , A0 const &amp;
&gt;::type const
construct(A0 const &amp; a0)
{
    return <a class="link" href="boost/proto/make_expr_id1241909.html" title="Function make_expr">proto::make_expr</a>&lt;
        <a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
    &gt;(
        construct_helper&lt;T&gt;()
      , boost::ref(a0)
    );
}

template&lt;typename T, typename A0, typename A1&gt;
typename <a class="link" href="boost/proto/result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a>&lt;
    <a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
  , construct_helper&lt;T&gt;
  , A0 const &amp;
  , A1 const &amp;
&gt;::type const
construct(A0 const &amp; a0, A1 const &amp; a1)
{
    return <a class="link" href="boost/proto/make_expr_id1241909.html" title="Function make_expr">proto::make_expr</a>&lt;
        <a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
    &gt;(
        construct_helper&lt;T&gt;()
      , boost::ref(a0)
      , boost::ref(a1)
    );
}

// ... and so on, up to BOOST_PROTO_MAX_ARITY-1 arguments ...</pre>
<p>
      </p>
<p>
        If <code class="computeroutput">BOOST_PROTO_LOCAL_LIMITS</code> is not defined by the user, it defaults
        to <code class="computeroutput">(1, BOOST_PROTO_MAX_ARITY)</code>.
      </p>
<p>
        At each iteration, <code class="computeroutput">BOOST_PROTO_LOCAL_MACRO()</code> is invoked with the current
        iteration number and the following 4 macro parameters:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_typename_A</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_A</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_A_a</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_a</code></li>
</ul></div>
<p>
        If these macros are not defined by the user, they default respectively to:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_typename_A.html" title="Macro BOOST_PROTO_typename_A">BOOST_PROTO_typename_A</a></code></li>
<li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_A_const_ref.html" title="Macro BOOST_PROTO_A_const_ref">BOOST_PROTO_A_const_ref</a></code></li>
<li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_A_const_ref_a.html" title="Macro BOOST_PROTO_A_const_ref_a">BOOST_PROTO_A_const_ref_a</a></code></li>
<li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_ref_a.html" title="Macro BOOST_PROTO_ref_a">BOOST_PROTO_ref_a</a></code></li>
</ul></div>
<p>
      </p>
<p>
        After including <code class="computeroutput">BOOST_PROTO_LOCAL_ITERATE()</code>, the
        following macros are automatically undefined:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_MACRO</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_LIMITS</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_typename_A</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_A</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_A_a</code></li>
<li class="listitem"><code class="computeroutput">BOOST_PROTO_LOCAL_a</code></li>
</ul></div>
<p>
      </p>
</div>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div></td>
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