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  26 <div class="refentry">
  27 <a name="boost.process.basic_native_environment"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Class template basic_native_environment</span></h2>
  30 <p>boost::process::basic_native_environment &#8212; Definition of the environment for the current process. </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_native_environment.html" title="Class template basic_native_environment">basic_native_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_native_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_native_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_native_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_native_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_native_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_native_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_native_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_native_environment/const_entry_type.html#boost.process.basic_native_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_native_environment/const_entry_type.html#boost.process.basic_native_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_native_environment/const_entry_type.html#boost.process.basic_native_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_native_environment/const_entry_type.html#boost.process.basic_native_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_native_environment/const_entry_type.html#boost.process.basic_native_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_native_environment/const_entry_type.html#boost.process.basic_native_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_native_environment/const_entry_type.html#idm45170605035856-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_native_environment/const_entry_type.html#idm45170605041856-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_native_environment/const_entry_type.html#idm45170605041296-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_native_environment/const_entry_type.html#idm45170605039376-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_native_environment/const_entry_type.html#idm45170605037440-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_native_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_native_environment/entry_type.html#boost.process.basic_native_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_native_environment/entry_type.html#boost.process.basic_native_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_native_environment/entry_type.html#boost.process.basic_native_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_native_environment/entry_type.html#boost.process.basic_native_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_native_environment/entry_type.html#boost.process.basic_native_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_native_environment/entry_type.html#boost.process.basic_native_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_native_environment/entry_type.html#idm45170605012048-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_native_environment/entry_type.html#idm45170605010224-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_native_environment/entry_type.html#idm45170605008656-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_native_environment/entry_type.html#idm45170605026704-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_native_environment/entry_type.html#idm45170605026144-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_native_environment/entry_type.html#idm45170605024224-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_native_environment/entry_type.html#idm45170605022288-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_native_environment/entry_type.html#idm45170605020864-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_native_environment/entry_type.html#idm45170605019024-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_native_environment/entry_type.html#idm45170605017120-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_native_environment/entry_type.html#idm45170605015232-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_native_environment/entry_type.html#idm45170605014096-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_native_environment.html#boost.process.basic_native_environmentconstruct-copy-destruct">construct/copy/destruct</a></span>
  90   <a class="link" href="basic_native_environment.html#idm45170604973472-bb"><span class="identifier">basic_native_environment</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  91   <a class="link" href="basic_native_environment.html#idm45170604972896-bb"><span class="identifier">basic_native_environment</span></a><span class="special">(</span><a class="link" href="basic_native_environment.html" title="Class template basic_native_environment">basic_native_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  92   <a class="link" href="basic_native_environment.html" title="Class template basic_native_environment">basic_native_environment</a> <span class="special">&amp;</span> <a class="link" href="basic_native_environment.html#idm45170604971328-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="basic_native_environment.html" title="Class template basic_native_environment">basic_native_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  93
  94   <span class="comment">// <a class="link" href="basic_native_environment.html#idm45170605001600-bb">public member functions</a></span>
  95   <span class="identifier">iterator</span> <a class="link" href="basic_native_environment.html#idm45170605001040-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  96   <span class="identifier">const_iterator</span> <a class="link" href="basic_native_environment.html#idm45170604999888-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  97   <span class="identifier">const_iterator</span> <a class="link" href="basic_native_environment.html#idm45170604998464-bb"><span class="identifier">cbegin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  98   <span class="identifier">iterator</span> <a class="link" href="basic_native_environment.html#idm45170604997040-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  99   <span class="identifier">const_iterator</span> <a class="link" href="basic_native_environment.html#idm45170604995888-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 100   <span class="identifier">const_iterator</span> <a class="link" href="basic_native_environment.html#idm45170604994464-bb"><span class="identifier">cend</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 101   <span class="identifier">iterator</span> <a class="link" href="basic_native_environment.html#idm45170604993040-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>
 102   <span class="identifier">const_iterator</span> <a class="link" href="basic_native_environment.html#idm45170604991200-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>
 103   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="basic_native_environment.html#idm45170604989088-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>
 104   <span class="keyword">void</span> <a class="link" href="basic_native_environment.html#idm45170604986992-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>
 105   <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>
 106   <a class="link" href="basic_native_environment.html#idm45170604985040-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>
 107   <span class="keyword">bool</span> <a class="link" href="basic_native_environment.html#idm45170604982496-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
 108   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="basic_native_environment.html#idm45170604981344-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
 109   <a class="link" href="basic_native_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a class="link" href="basic_native_environment.html#idm45170604979920-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>
 110   <a class="link" href="basic_native_environment/const_entry_type.html" title="Struct template const_entry_type">const_entry_type</a> <a class="link" href="basic_native_environment.html#idm45170604977920-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>
 111   <a class="link" href="basic_native_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a class="link" href="basic_native_environment.html#idm45170604975648-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>
 112 <span class="special">}</span><span class="special">;</span></pre></div>
 113 <div class="refsect1">
 114 <a name="id-1.3.31.9.9.4.4"></a><h2>Description</h2>
 115 <p>Template representation of the environment of this process. It takes a template as template parameter to implement the environment. All instances of this class refer to the same environment, but might not get updated if another one makes changes. </p>
 116 <div class="refsect2">
 117 <a name="id-1.3.31.9.9.4.4.3"></a><h3>
 118 <a name="boost.process.basic_native_environmentconstruct-copy-destruct"></a><code class="computeroutput">basic_native_environment</code>
 119         public
 120        construct/copy/destruct</h3>
 121 <div class="orderedlist"><ol class="orderedlist" type="1">
 122 <li class="listitem">
 123 <pre class="literallayout"><a name="idm45170604973472-bb"></a><span class="identifier">basic_native_environment</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Default constructor. </li>
 124 <li class="listitem">
 125 <pre class="literallayout"><a name="idm45170604972896-bb"></a><span class="identifier">basic_native_environment</span><span class="special">(</span><a class="link" href="basic_native_environment.html" title="Class template basic_native_environment">basic_native_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span></pre>Move constructor. </li>
 126 <li class="listitem">
 127 <pre class="literallayout"><a class="link" href="basic_native_environment.html" title="Class template basic_native_environment">basic_native_environment</a> <span class="special">&amp;</span> <a name="idm45170604971328-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="basic_native_environment.html" title="Class template basic_native_environment">basic_native_environment</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span></pre>Move assignment. </li>
 128 </ol></div>
 129 </div>
 130 <div class="refsect2">
 131 <a name="id-1.3.31.9.9.4.4.4"></a><h3>
 132 <a name="idm45170605001600-bb"></a><code class="computeroutput">basic_native_environment</code> public member functions</h3>
 133 <div class="orderedlist"><ol class="orderedlist" type="1">
 134 <li class="listitem">
 135 <pre class="literallayout"><span class="identifier">iterator</span> <a name="idm45170605001040-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>
 136 <li class="listitem">
 137 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170604999888-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>
 138 <li class="listitem">
 139 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170604998464-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>
 140 <li class="listitem">
 141 <pre class="literallayout"><span class="identifier">iterator</span> <a name="idm45170604997040-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>
 142 <li class="listitem">
 143 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170604995888-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>
 144 <li class="listitem">
 145 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170604994464-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>
 146 <li class="listitem">
 147 <pre class="literallayout"><span class="identifier">iterator</span> <a name="idm45170604993040-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>
 148 <li class="listitem">
 149 <pre class="literallayout"><span class="identifier">const_iterator</span> <a name="idm45170604991200-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>
 150 <li class="listitem">
 151 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idm45170604989088-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>
 152 <li class="listitem">
 153 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604986992-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>
 154 <p>Erase variable by id. </p>
 155 </li>
 156 <li class="listitem">
 157 <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>
 158 <a name="idm45170604985040-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>
 159 <li class="listitem">
 160 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170604982496-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>
 161 <li class="listitem">
 162 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idm45170604981344-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>
 163 <li class="listitem">
 164 <pre class="literallayout"><a class="link" href="basic_native_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a name="idm45170604979920-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>
 165 <li class="listitem">
 166 <pre class="literallayout"><a class="link" href="basic_native_environment/const_entry_type.html" title="Struct template const_entry_type">const_entry_type</a> <a name="idm45170604977920-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>
 167 <li class="listitem">
 168 <pre class="literallayout"><a class="link" href="basic_native_environment/entry_type.html" title="Struct template entry_type">entry_type</a> <a name="idm45170604975648-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>
 169 </ol></div>
 170 </div>
 171 </div>
 172 </div>
 173 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 174 <td align="left"></td>
 175 <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2012 Julio M. Merino Vidal, Ilya Sokolov,
 176       Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright &#169; 2016 Klemens D. Morgenstern<p>
 177         Distributed under the Boost Software License, Version 1.0. (See accompanying
 178         file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 179       </p>
 180 </div></td>
 181 </tr></table>
 182 <hr>
 183 <div class="spirit-nav">
 184 <a accesskey="p" href="basic_environment/entry_type.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_native_environment/const_entry_type.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
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