1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Struct empty_env</title> 6<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../proto/reference.html#header.boost.proto.transform.env_hpp" title="Header <boost/proto/transform/env.hpp>"> 10<link rel="prev" href="key_not_found.html" title="Struct key_not_found"> 11<link rel="next" href="env.html" title="Struct template env"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 16<td align="center"><a href="../../../../index.html">Home</a></td> 17<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="key_not_found.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.transform.env_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="env.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.proto.empty_env"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct empty_env</span></h2> 30<p>boost::proto::empty_env — 31 The type of an object that represents a transform environment 32 with no key/value pairs in it. 33 </p> 34</div> 35<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 36<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.transform.env_hpp" title="Header <boost/proto/transform/env.hpp>">boost/proto/transform/env.hpp</a>> 37 38</span> 39<span class="keyword">struct</span> <a class="link" href="empty_env.html" title="Struct empty_env">empty_env</a> <span class="special">{</span> 40 41 <span class="comment">// <a class="link" href="empty_env.html#id-1_3_33_5_44_1_1_2_2-bb">public member functions</a></span> 42 <a class="link" href="key_not_found.html" title="Struct key_not_found">proto::key_not_found</a> <a class="link" href="empty_env.html#id-1_3_33_5_44_1_1_2_2_1-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><em class="replaceable"><code><span class="identifier">unspecified</span></code></em><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 43<span class="special">}</span><span class="special">;</span></pre></div> 44<div class="refsect1"> 45<a name="id-1.3.33.5.46.11.4"></a><h2>Description</h2> 46<div class="refsect2"> 47<a name="id-1.3.33.5.46.11.4.2"></a><h3> 48<a name="id-1_3_33_5_44_1_1_2_2-bb"></a><code class="computeroutput">empty_env</code> public member functions</h3> 49<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 50<pre class="literallayout"><a class="link" href="key_not_found.html" title="Struct key_not_found">proto::key_not_found</a> <a name="id-1_3_33_5_44_1_1_2_2_1-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><em class="replaceable"><code><span class="identifier">unspecified</span></code></em><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 51<p>The type of the argument to this function has a 52 user-defined implicit conversion from any type.</p> 53</li></ol></div> 54</div> 55</div> 56</div> 57<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 58<td align="left"></td> 59<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 60 Distributed under the Boost Software License, Version 1.0. (See accompanying 61 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>) 62 </p> 63</div></td> 64</tr></table> 65<hr> 66<div class="spirit-nav"> 67<a accesskey="p" href="key_not_found.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.transform.env_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="env.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 68</div> 69</body> 70</html> 71
