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  27 <a name="boost.process.basic_environment"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Class template basic_environment</span></h2>
  30 <p>boost::process::basic_environment &#8212; Type definition to hold a seperate environment. </p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../process/reference.html#header.boost.process.environment_hpp" title="Header &lt;boost/process/environment.hpp&gt;">boost/process/environment.hpp</a>&gt;
  34
  35 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Char<span class="special">&gt;</span>
  36 <span class="keyword">class</span> <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">{</span>
  37 <span class="keyword">public</span><span class="special">:</span>
  38   <span class="comment">// types</span>
  39   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">Char</span> <span class="special">&gt;</span>                               <a name="boost.process.basic_environment.string_type"></a><span class="identifier">string_type</span><span class="special">;</span>
  40   <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">transform_iterator</span><span class="special">&lt;</span> <span class="identifier">entry_maker</span><span class="special">,</span> <span class="identifier">Char</span> <span class="special">*</span><span class="special">*</span> <span class="special">&gt;</span>       <a name="boost.process.basic_environment.iterator"></a><span class="identifier">iterator</span><span class="special">;</span>
  41   <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">transform_iterator</span><span class="special">&lt;</span> <span class="identifier">const_entry_maker</span><span class="special">,</span> <span class="identifier">Char</span> <span class="special">*</span><span class="special">*</span> <span class="special">&gt;</span> <a name="boost.process.basic_environment.const_iterator"></a><span class="identifier">const_iterator</span><span class="special">;</span>
  42   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>                                             <a name="boost.process.basic_environment.size_type"></a><span class="identifier">size_type</span><span class="special">;</span>
  43   <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>                                             <a name="boost.process.basic_environment.native_handle"></a><span class="identifier">native_handle</span><span class="special">;</span>
  44   <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>                                             <a name="boost.process.basic_environment.base_type"></a><span class="identifier">base_type</span><span class="special">;</span>
  45
  46   <span class="comment">// member classes/structs/unions</span>
  47   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Char<span class="special">,</span> <span class="keyword">typename</span> Environment<span class="special">&gt;</span>
  48   <span class="keyword">struct</span> <a class="link" href="basic_environment/const_entry_type.html" title="Struct template const_entry_type">const_entry_type</a> <span class="special">{</span>
  49     <span class="comment">// types</span>
  50     <span class="keyword">typedef</span> <span class="identifier">Char</span>                             <a class="link" href="basic_environment/const_entry_type.html#boost.process.basic_environment.const_entry_type.value_type"><span class="identifier">value_type</span></a><span class="special">;</span>
  51     <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span>               <a class="link" href="basic_environment/const_entry_type.html#boost.process.basic_environment.const_entry_type.pointer"><span class="identifier">pointer</span></a><span class="special">;</span>
  52     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">value_type</span> <span class="special">&gt;</span>  <a class="link" href="basic_environment/const_entry_type.html#boost.process.basic_environment.const_entry_type.string_type"><span class="identifier">string_type</span></a><span class="special">;</span>
  53     <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span><span class="special">&lt;</span> <span class="identifier">pointer</span> <span class="special">&gt;</span> <a class="link" href="basic_environment/const_entry_type.html#boost.process.basic_environment.const_entry_type.range"><span class="identifier">range</span></a><span class="special">;</span>
  54     <span class="keyword">typedef</span> <span class="identifier">Environment</span>                      <a class="link" href="basic_environment/const_entry_type.html#boost.process.basic_environment.const_entry_type.environment_t"><span class="identifier">environment_t</span></a><span class="special">;</span>
  55
  56     <span class="comment">// <a class="link" href="basic_environment/const_entry_type.html#boost.process.basic_environment.const_entry_typeconstruct-copy-destruct">construct/copy/destruct</a></span>
  57     <span class="identifier">const_entry</span> <span class="special">&amp;</span> <a class="link" href="basic_environment/const_entry_type.html#idm45170605118192-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">const_entry</span> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  58
  59     <span class="comment">// <a class="link" href="basic_environment/const_entry_type.html#idm45170605123520-bb">public member functions</a></span>
  60     <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="identifier">string_type</span> <span class="special">&gt;</span> <a class="link" href="basic_environment/const_entry_type.html#idm45170605123024-bb"><span class="identifier">to_vector</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  61      <a class="link" href="basic_environment/const_entry_type.html#idm45170605121312-bb"><span class="identifier">const_entry</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">const_entry</span> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  62     <span class="keyword">bool</span> <a class="link" href="basic_environment/const_entry_type.html#idm45170605119568-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  63   <span class="special">}</span><span class="special">;</span>
  64   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Char<span class="special">,</span> <span class="keyword">typename</span> Environment<span class="special">&gt;</span>
  65   <span class="keyword">struct</span> <a class="link" href="basic_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <span class="special">{</span>
  66     <span class="comment">// types</span>
  67     <span class="keyword">typedef</span> <span class="identifier">Char</span>                             <a class="link" href="basic_environment/entry_type.html#boost.process.basic_environment.entry_type.value_type"><span class="identifier">value_type</span></a><span class="special">;</span>
  68     <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span>               <a class="link" href="basic_environment/entry_type.html#boost.process.basic_environment.entry_type.pointer"><span class="identifier">pointer</span></a><span class="special">;</span>
  69     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">value_type</span> <span class="special">&gt;</span>  <a class="link" href="basic_environment/entry_type.html#boost.process.basic_environment.entry_type.string_type"><span class="identifier">string_type</span></a><span class="special">;</span>
  70     <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span><span class="special">&lt;</span> <span class="identifier">pointer</span> <span class="special">&gt;</span> <a class="link" href="basic_environment/entry_type.html#boost.process.basic_environment.entry_type.range"><span class="identifier">range</span></a><span class="special">;</span>
  71     <span class="keyword">typedef</span> <span class="identifier">Environment</span>                      <a class="link" href="basic_environment/entry_type.html#boost.process.basic_environment.entry_type.environment_t"><span class="identifier">environment_t</span></a><span class="special">;</span>
  72
  73     <span class="comment">// <a class="link" href="basic_environment/entry_type.html#boost.process.basic_environment.entry_typeconstruct-copy-destruct">construct/copy/destruct</a></span>
  74     <span class="identifier">entry</span> <span class="special">&amp;</span> <a class="link" href="basic_environment/entry_type.html#idm45170605096848-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">entry</span> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  75     <span class="identifier">entry</span> <span class="special">&amp;</span> <a class="link" href="basic_environment/entry_type.html#idm45170605095216-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  76     <span class="identifier">entry</span> <span class="special">&amp;</span> <a class="link" href="basic_environment/entry_type.html#idm45170605093824-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="identifier">string_type</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  77
  78     <span class="comment">// <a class="link" href="basic_environment/entry_type.html#idm45170605110000-bb">public member functions</a></span>
  79     <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="identifier">string_type</span> <span class="special">&gt;</span> <a class="link" href="basic_environment/entry_type.html#idm45170605109504-bb"><span class="identifier">to_vector</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  80      <a class="link" href="basic_environment/entry_type.html#idm45170605107792-bb"><span class="identifier">entry</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">entry</span> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  81     <span class="keyword">bool</span> <a class="link" href="basic_environment/entry_type.html#idm45170605106048-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  82     <span class="keyword">void</span> <a class="link" href="basic_environment/entry_type.html#idm45170605104800-bb"><span class="identifier">assign</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  83     <span class="keyword">void</span> <a class="link" href="basic_environment/entry_type.html#idm45170605103168-bb"><span class="identifier">assign</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="identifier">string_type</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  84     <span class="keyword">void</span> <a class="link" href="basic_environment/entry_type.html#idm45170605101440-bb"><span class="identifier">append</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  85     <span class="keyword">void</span> <a class="link" href="basic_environment/entry_type.html#idm45170605099712-bb"><span class="identifier">clear</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  86     <span class="identifier">entry</span> <span class="special">&amp;</span> <a class="link" href="basic_environment/entry_type.html#idm45170605098704-bb"><span class="keyword">operator</span><span class="special">+=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  87   <span class="special">}</span><span class="special">;</span>
  88
  89   <span class="comment">// <a class="link" href="basic_environment.html#boost.process.basic_environmentconstruct-copy-destruct">construct/copy/destruct</a></span>
  90   <a class="link" href="basic_environment.html#idm45170605059664-bb"><span class="identifier">basic_environment</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  91   <a class="link" href="basic_environment.html#idm45170605059088-bb"><span class="identifier">basic_environment</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  92   <a class="link" href="basic_environment.html#idm45170605057376-bb"><span class="identifier">basic_environment</span></a><span class="special">(</span><a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  93   <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span> <a class="link" href="basic_environment.html#idm45170605055824-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  94   <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span> <a class="link" href="basic_environment.html#idm45170605053536-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  95
  96   <span class="comment">// <a class="link" href="basic_environment.html#idm45170605087568-bb">public member functions</a></span>
  97   <span class="identifier">iterator</span> <a class="link" href="basic_environment.html#idm45170605087072-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  98   <span class="identifier">const_iterator</span> <a class="link" href="basic_environment.html#idm45170605086064-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  99   <span class="identifier">const_iterator</span> <a class="link" href="basic_environment.html#idm45170605084816-bb"><span class="identifier">cbegin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 100   <span class="identifier">iterator</span> <a class="link" href="basic_environment.html#idm45170605083568-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
 101   <span class="identifier">const_iterator</span> <a class="link" href="basic_environment.html#idm45170605082560-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 102   <span class="identifier">const_iterator</span> <a class="link" href="basic_environment.html#idm45170605081312-bb"><span class="identifier">cend</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 103   <span class="identifier">iterator</span> <a class="link" href="basic_environment.html#idm45170605080064-bb"><span class="identifier">find</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 104   <span class="identifier">const_iterator</span> <a class="link" href="basic_environment.html#idm45170605078432-bb"><span class="identifier">find</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 105   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="basic_environment.html#idm45170605076560-bb"><span class="identifier">count</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 106   <span class="keyword">void</span> <a class="link" href="basic_environment.html#idm45170605074688-bb"><span class="identifier">erase</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 107   <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span> <span class="identifier">iterator</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">&gt;</span>
 108   <a class="link" href="basic_environment.html#idm45170605072928-bb"><span class="identifier">emplace</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 109   <span class="keyword">bool</span> <a class="link" href="basic_environment.html#idm45170605070672-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
 110   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="basic_environment.html#idm45170605069664-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 111   <span class="keyword">void</span> <a class="link" href="basic_environment.html#idm45170605068272-bb"><span class="identifier">clear</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
 112   <a class="link" href="basic_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a class="link" href="basic_environment.html#idm45170605066112-bb"><span class="identifier">at</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 113   <a class="link" href="basic_environment/const_entry_type.html" title="Struct template const_entry_type">const_entry_type</a> <a class="link" href="basic_environment.html#idm45170605064112-bb"><span class="identifier">at</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 114   <a class="link" href="basic_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a class="link" href="basic_environment.html#idm45170605061840-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 115 <span class="special">}</span><span class="special">;</span></pre></div>
 116 <div class="refsect1">
 117 <a name="id-1.3.31.9.9.3.4"></a><h2>Description</h2>
 118 <p>Template representation of environments. It takes a character type (<code class="computeroutput">char</code> or <code class="computeroutput">wchar_t</code>) as template parameter to implement the environment </p>
 119 <div class="refsect2">
 120 <a name="id-1.3.31.9.9.3.4.3"></a><h3>
 121 <a name="boost.process.basic_environmentconstruct-copy-destruct"></a><code class="computeroutput">basic_environment</code>
 122         public
 123        construct/copy/destruct</h3>
 124 <div class="orderedlist"><ol class="orderedlist" type="1">
 125 <li class="listitem">
 126 <pre class="literallayout"><a name="idm45170605059664-bb"></a><span class="identifier">basic_environment</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Default constructor. </li>
 127 <li class="listitem">
 128 <pre class="literallayout"><a name="idm45170605059088-bb"></a><span class="identifier">basic_environment</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span></pre>Copy constructor. </li>
 129 <li class="listitem">
 130 <pre class="literallayout"><a name="idm45170605057376-bb"></a><span class="identifier">basic_environment</span><span class="special">(</span><a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span></pre>Move constructor. </li>
 131 <li class="listitem">
 132 <pre class="literallayout"><a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span> <a name="idm45170605055824-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span></pre>Copy assignment. </li>
 133 <li class="listitem">
 134 <pre class="literallayout"><a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;</span> <a name="idm45170605053536-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="basic_environment.html" title="Class template basic_environment">basic_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span></pre>Move assignment. </li>
 135 </ol></div>
 136 </div>
 137 <div class="refsect2">
 138 <a name="id-1.3.31.9.9.3.4.4"></a><h3>
 139 <a name="idm45170605087568-bb"></a><code class="computeroutput">basic_environment</code> public member functions</h3>
 140 <div class="orderedlist"><ol class="orderedlist" type="1">
 141 <li class="listitem">
 142 <pre class="literallayout"><span class="identifier">iterator</span> <a name="idm45170605087072-bb"></a><span class="identifier">begin</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Returns an iterator to the beginning. </li>
 143 <li class="listitem">
 144 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170605086064-bb"></a><span class="identifier">begin</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns an iterator to the beginning. </li>
 145 <li class="listitem">
 146 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170605084816-bb"></a><span class="identifier">cbegin</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns an iterator to the beginning. </li>
 147 <li class="listitem">
 148 <pre class="literallayout"><span class="identifier">iterator</span> <a name="idm45170605083568-bb"></a><span class="identifier">end</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Returns an iterator to the end. </li>
 149 <li class="listitem">
 150 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170605082560-bb"></a><span class="identifier">end</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns an iterator to the end. </li>
 151 <li class="listitem">
 152 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170605081312-bb"></a><span class="identifier">cend</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns an iterator to the end. </li>
 153 <li class="listitem">
 154 <pre class="literallayout"><span class="identifier">iterator</span> <a name="idm45170605080064-bb"></a><span class="identifier">find</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> key<span class="special">)</span><span class="special">;</span></pre>Find a variable by its name. </li>
 155 <li class="listitem">
 156 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170605078432-bb"></a><span class="identifier">find</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> key<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Find a variable by its name. </li>
 157 <li class="listitem">
 158 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idm45170605076560-bb"></a><span class="identifier">count</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> st<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Number of variables. </li>
 159 <li class="listitem">
 160 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605074688-bb"></a><span class="identifier">erase</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> id<span class="special">)</span><span class="special">;</span></pre>
 161 <p>Erase variable by id. </p>
 162 </li>
 163 <li class="listitem">
 164 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span> <span class="identifier">iterator</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">&gt;</span>
 165 <a name="idm45170605072928-bb"></a><span class="identifier">emplace</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> id<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> value<span class="special">)</span><span class="special">;</span></pre>Emplace an environment variable. </li>
 166 <li class="listitem">
 167 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605070672-bb"></a><span class="identifier">empty</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Check if environment has entries. </li>
 168 <li class="listitem">
 169 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idm45170605069664-bb"></a><span class="identifier">size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Get the number of variables. </li>
 170 <li class="listitem">
 171 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605068272-bb"></a><span class="identifier">clear</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Clear the environment. <div class="note"><table border="0" summary="Note">
 172 <tr>
 173 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
 174 <th align="left">Note</th>
 175 </tr>
 176 <tr><td align="left" valign="top"><p>Use with care, passed environment cannot be empty. </p></td></tr>
 177 </table></div>
 178 <p>
 179 </p>
 180 </li>
 181 <li class="listitem">
 182 <pre class="literallayout"><a class="link" href="basic_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a name="idm45170605066112-bb"></a><span class="identifier">at</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> key<span class="special">)</span><span class="special">;</span></pre>Get the entry with the key. Throws if it does not exist. </li>
 183 <li class="listitem">
 184 <pre class="literallayout"><a class="link" href="basic_environment/const_entry_type.html" title="Struct template const_entry_type">const_entry_type</a> <a name="idm45170605064112-bb"></a><span class="identifier">at</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> key<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Get the entry with the key. Throws if it does not exist. </li>
 185 <li class="listitem">
 186 <pre class="literallayout"><a class="link" href="basic_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a name="idm45170605061840-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span> key<span class="special">)</span><span class="special">;</span></pre>Get the entry with the given key. It creates the entry if it doesn't exist. </li>
 187 </ol></div>
 188 </div>
 189 </div>
 190 </div>
 191 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 192 <td align="left"></td>
 193 <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2012 Julio M. Merino Vidal, Ilya Sokolov,
 194       Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright &#169; 2016 Klemens D. Morgenstern<p>
 195         Distributed under the Boost Software License, Version 1.0. (See accompanying
 196         file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 197       </p>
 198 </div></td>
 199 </tr></table>
 200 <hr>
 201 <div class="spirit-nav">
 202 <a accesskey="p" href="env.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../process/reference.html#header.boost.process.environment_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="basic_environment/const_entry_type.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
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