Imported Upstream version 1.57.0
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 <title>Struct template impl</title>
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 <a name="boost.proto._data.impl"></a><div class="titlepage"></div>
 
 </span>
 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">,</span> <span class="keyword">typename</span> State<span class="special">,</span> <span class="keyword">typename</span> Data<span class="special">&gt;</span> 
-<span class="keyword">struct</span> <a class="link" href="impl.html" title="Struct template impl">impl</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span> <span class="special">&gt;</span> <span class="special">{</span>
-  <span class="comment">// types</span>
-  <span class="keyword">typedef</span> <span class="identifier">Data</span> <a name="boost.proto._data.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
-
-  <span class="comment">// <a class="link" href="impl.html#id1552271-bb">public member functions</a></span>
-  <span class="identifier">Data</span> <a class="link" href="impl.html#id1552276-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> 
-                  <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+<span class="keyword">struct</span> <a class="link" href="impl.html" title="Struct template impl">impl</a> <span class="special">:</span> <span class="keyword"></span> 
+    <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_c</span><span class="special">&lt;</span>
+      <a class="link" href="../is_env.html" title="Struct template is_env">proto::is_env</a><span class="special">&lt;</span><span class="identifier">Data</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</span>
+      <a class="link" href="../_env_var.html" title="Struct template _env_var">proto::_env_var</a><span class="special">&lt;</span><a class="link" href="../data_type.html" title="Struct data_type">proto::data_type</a><span class="special">&gt;</span><span class="special">,</span>
+      <a class="link" href="../_env.html" title="Struct _env">proto::_env</a>
+    <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">impl</span><span class="special">&lt;</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">&gt;</span>
+<span class="special">{</span>
 <span class="special">}</span><span class="special">;</span></pre></div>
-<div class="refsect1">
-<a name="id2902089"></a><h2>Description</h2>
-<div class="refsect2">
-<a name="id2902092"></a><h3>
-<a name="id1552271-bb"></a><code class="computeroutput">impl</code> public member functions</h3>
-<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
-<pre class="literallayout"><span class="identifier">Data</span> <a name="id1552276-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> 
-                <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span> data<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
-<p>
-                  Returns the current data.
-                </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">Parameters:</span></p></td>
-<td><div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><code class="computeroutput">data</code></span></p></td>
-<td><p>The current data. </p></td>
-</tr></tbody>
-</table></div></td>
-</tr>
-<tr>
-<td><p><span class="term">Returns:</span></p></td>
-<td><p>
-                  <code class="computeroutput">data</code>
-                </p></td>
-</tr>
-<tr>
-<td><p><span class="term">Throws:</span></p></td>
-<td>Will not throw.</td>
-</tr>
-</tbody>
-</table></div>
-</li></ol></div>
-</div>
-</div>
 </div>
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 <td align="left"></td>
@@ -91,7 +52,7 @@
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