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<title>Macro BOOST_PROTO_REPEAT_FROM_TO</title>
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<h2><span class="refentrytitle">Macro BOOST_PROTO_REPEAT_FROM_TO</span></h2>
<p>BOOST_PROTO_REPEAT_FROM_TO — Repeatedly invoke the specified 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="comment">// In header: <<a class="link" href="proto/reference.html#header.boost.proto.repeat_hpp" title="Header <boost/proto/repeat.hpp>">boost/proto/repeat.hpp</a>>
</span>BOOST_PROTO_REPEAT_FROM_TO(FROM, TO, MACRO)</pre></div>
<div class="refsect1">
<a name="idp455672256"></a><h2>Description</h2>
<p>
<code class="computeroutput">BOOST_PROTO_REPEAT_FROM_TO()</code> is used to generate the kind of repetitive
code that is typical of EDSLs built with Proto.
<code class="computeroutput">BOOST_PROTO_REPEAT_FROM_TO(<em class="replaceable"><code>FROM</code></em>, <em class="replaceable"><code>TO</code></em>, <em class="replaceable"><code>MACRO</code></em>)</code>
is equivalent to:
</p>
<p>
</p>
<pre class="programlisting"><em class="replaceable"><code><span class="identifier">MACRO</span></code></em><span class="special">(</span><em class="replaceable"><code><span class="identifier">FROM</span></code></em><span class="special">,</span> <a class="link" href="BOOST_PROTO_typename_A.html" title="Macro BOOST_PROTO_typename_A">BOOST_PROTO_typename_A</a><span class="special">,</span> <a class="link" href="BOOST_PROTO_A_const_ref.html" title="Macro BOOST_PROTO_A_const_ref">BOOST_PROTO_A_const_ref</a><span class="special">,</span> <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><span class="special">,</span> <a class="link" href="BOOST_PROTO_ref_a.html" title="Macro BOOST_PROTO_ref_a">BOOST_PROTO_ref_a</a><span class="special">)</span>
<em class="replaceable"><code><span class="identifier">MACRO</span></code></em><span class="special">(</span><em class="replaceable"><code><span class="identifier">FROM</span><span class="special">+</span><span class="number">1</span></code></em><span class="special">,</span> <a class="link" href="BOOST_PROTO_typename_A.html" title="Macro BOOST_PROTO_typename_A">BOOST_PROTO_typename_A</a><span class="special">,</span> <a class="link" href="BOOST_PROTO_A_const_ref.html" title="Macro BOOST_PROTO_A_const_ref">BOOST_PROTO_A_const_ref</a><span class="special">,</span> <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><span class="special">,</span> <a class="link" href="BOOST_PROTO_ref_a.html" title="Macro BOOST_PROTO_ref_a">BOOST_PROTO_ref_a</a><span class="special">)</span>
<span class="special">...</span>
<em class="replaceable"><code><span class="identifier">MACRO</span></code></em><span class="special">(</span><em class="replaceable"><code><span class="identifier">TO</span><span class="special">-</span><span class="number">1</span></code></em><span class="special">,</span> <a class="link" href="BOOST_PROTO_typename_A.html" title="Macro BOOST_PROTO_typename_A">BOOST_PROTO_typename_A</a><span class="special">,</span> <a class="link" href="BOOST_PROTO_A_const_ref.html" title="Macro BOOST_PROTO_A_const_ref">BOOST_PROTO_A_const_ref</a><span class="special">,</span> <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><span class="special">,</span> <a class="link" href="BOOST_PROTO_ref_a.html" title="Macro BOOST_PROTO_ref_a">BOOST_PROTO_ref_a</a><span class="special">)</span></pre>
<p>
</p>
<p>
<span class="bold"><strong>Example:</strong></span>
</p>
<p>
</p>
<pre class="programlisting"><span class="comment">// Generate BOOST_PROTO_MAX_ARITY-1 overloads of the</span>
<span class="comment">// following construct() function template.</span>
<span class="preprocessor">#define</span> <span class="identifier">M0</span><span class="special">(</span><span class="identifier">N</span><span class="special">,</span> <span class="identifier">typename_A</span><span class="special">,</span> <span class="identifier">A_const_ref</span><span class="special">,</span> <span class="identifier">A_const_ref_a</span><span class="special">,</span> <span class="identifier">ref_a</span><span class="special">)</span> \
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">typename_A</span><span class="special">(</span><span class="identifier">N</span><span class="special">)</span><span class="special">></span> \
<span class="keyword">typename</span> <a class="link" href="boost/proto/result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a><span class="special"><</span> \
<a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a> \
<span class="special">,</span> <span class="identifier">construct_helper</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> \
<span class="special">,</span> <span class="identifier">A_const_ref</span><span class="special">(</span><span class="identifier">N</span><span class="special">)</span> \
<span class="special">></span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span> \
<span class="identifier">construct</span><span class="special">(</span><span class="identifier">A_const_ref_a</span><span class="special">(</span><span class="identifier">N</span><span class="special">)</span><span class="special">)</span> \
<span class="special">{</span> \
<span class="keyword">return</span> <a class="link" href="boost/proto/make_expr_idp728389200.html" title="Function make_expr">proto::make_expr</a><span class="special"><</span> \
<a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a> \
<span class="special">></span><span class="special">(</span> \
<span class="identifier">construct_helper</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span><span class="special">(</span><span class="special">)</span> \
<span class="special">,</span> <span class="identifier">ref_a</span><span class="special">(</span><span class="identifier">N</span><span class="special">)</span> \
<span class="special">)</span><span class="special">;</span> \
<span class="special">}</span>
<span class="identifier">BOOST_PROTO_REPEAT_FROM_TO</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="identifier">BOOST_PROTO_MAX_ARITY</span><span class="special">,</span> <span class="identifier">M0</span><span class="special">)</span>
<span class="preprocessor">#undef</span> <span class="identifier">M0</span></pre>
<p>
</p>
<p>
The above invocation of <code class="computeroutput">BOOST_PROTO_REPEAT_FROM_TO()</code>
will generate the following code:
</p>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">></span>
<span class="keyword">typename</span> <a class="link" href="boost/proto/result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a><span class="special"><</span>
<a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
<span class="special">,</span> <span class="identifier">construct_helper</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span>
<span class="special">,</span> <span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span>
<span class="special">></span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span>
<span class="identifier">construct</span><span class="special">(</span><span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a0</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <a class="link" href="boost/proto/make_expr_idp728389200.html" title="Function make_expr">proto::make_expr</a><span class="special"><</span>
<a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
<span class="special">></span><span class="special">(</span>
<span class="identifier">construct_helper</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span><span class="special">(</span><span class="special">)</span>
<span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">a0</span><span class="special">)</span>
<span class="special">)</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A1</span><span class="special">></span>
<span class="keyword">typename</span> <a class="link" href="boost/proto/result_of/make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a><span class="special"><</span>
<a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
<span class="special">,</span> <span class="identifier">construct_helper</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span>
<span class="special">,</span> <span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span>
<span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&</span>
<span class="special">></span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span>
<span class="identifier">construct</span><span class="special">(</span><span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a0</span><span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a1</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <a class="link" href="boost/proto/make_expr_idp728389200.html" title="Function make_expr">proto::make_expr</a><span class="special"><</span>
<a class="link" href="boost/proto/tag/function.html" title="Struct function">proto::tag::function</a>
<span class="special">></span><span class="special">(</span>
<span class="identifier">construct_helper</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span><span class="special">(</span><span class="special">)</span>
<span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">a0</span><span class="special">)</span>
<span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">a1</span><span class="special">)</span>
<span class="special">)</span><span class="special">;</span>
<span class="special">}</span>
<span class="comment">// ... and so on, up to BOOST_PROTO_MAX_ARITY-1 arguments ...</span></pre>
<p>
</p>
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<td align="right"><div class="copyright-footer">Copyright © 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>
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