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>Class template basic_native_environment</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="../../process/reference.html#header.boost.process.environment_hpp" title="Header <boost/process/environment.hpp>"> 10<link rel="prev" href="basic_environment/entry_type.html" title="Struct template entry_type"> 11<link rel="next" href="basic_native_environment/const_entry_type.html" title="Struct template const_entry_type"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td 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src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 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 — 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: <<a class="link" href="../../process/reference.html#header.boost.process.environment_hpp" title="Header <boost/process/environment.hpp>">boost/process/environment.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Char<span class="special">></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"><</span> <span class="identifier">Char</span> <span class="special">></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"><</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">></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"><</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">></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"><</span><span class="keyword">typename</span> Char<span class="special">,</span> <span class="keyword">typename</span> Environment<span class="special">></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"><</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.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"><</span> <span class="identifier">pointer</span> <span class="special">></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">&</span> <a class="link" href="basic_native_environment/const_entry_type.html#idm45243674922176-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">&</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#idm45243674928176-bb">public member functions</a></span> 60 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span> <span class="identifier">string_type</span> <span class="special">></span> <a class="link" href="basic_native_environment/const_entry_type.html#idm45243674927616-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#idm45243674925696-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">&</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#idm45243674923760-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"><</span><span class="keyword">typename</span> Char<span class="special">,</span> <span class="keyword">typename</span> Environment<span class="special">></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"><</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.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"><</span> <span class="identifier">pointer</span> <span class="special">></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">&</span> <a class="link" href="basic_native_environment/entry_type.html#idm45243674898368-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">&</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">&</span> <a class="link" href="basic_native_environment/entry_type.html#idm45243674896544-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">&</span><span class="special">)</span><span class="special">;</span> 76 <span class="identifier">entry</span> <span class="special">&</span> <a class="link" href="basic_native_environment/entry_type.html#idm45243674894976-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"><</span> <span class="identifier">string_type</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 77 78 <span class="comment">// <a class="link" href="basic_native_environment/entry_type.html#idm45243674913024-bb">public member functions</a></span> 79 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span> <span class="identifier">string_type</span> <span class="special">></span> <a class="link" href="basic_native_environment/entry_type.html#idm45243674912464-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#idm45243674910544-bb"><span class="identifier">entry</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">entry</span> <span class="special">&</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#idm45243674908608-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#idm45243674907184-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">&</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#idm45243674905344-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"><</span> <span class="identifier">string_type</span> <span class="special">></span> <span class="special">&</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#idm45243674903440-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">&</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#idm45243674901552-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">&</span> <a class="link" href="basic_native_environment/entry_type.html#idm45243674900416-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">&</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#idm45243674859792-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#idm45243674859216-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">&&</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">&</span> <a class="link" href="basic_native_environment.html#idm45243674857648-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">&&</span><span class="special">)</span><span class="special">;</span> 93 94 <span class="comment">// <a class="link" href="basic_native_environment.html#idm45243674887920-bb">public member functions</a></span> 95 <span class="identifier">iterator</span> <a class="link" href="basic_native_environment.html#idm45243674887360-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#idm45243674886208-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#idm45243674884784-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#idm45243674883360-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#idm45243674882208-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#idm45243674880784-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#idm45243674879360-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">&</span><span class="special">)</span><span class="special">;</span> 102 <span class="identifier">const_iterator</span> <a class="link" href="basic_native_environment.html#idm45243674877520-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">&</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#idm45243674875408-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">&</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#idm45243674873312-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">&</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"><</span> <span class="identifier">iterator</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">></span> 106 <a class="link" href="basic_native_environment.html#idm45243674871360-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">&</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 107 <span class="keyword">bool</span> <a class="link" href="basic_native_environment.html#idm45243674868816-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#idm45243674867664-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#idm45243674866240-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">&</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#idm45243674864240-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">&</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#idm45243674861968-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">&</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-1.3.30.9.9.4.4"></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-1.3.30.9.9.4.4.3"></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="idm45243674859792-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="idm45243674859216-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">&&</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">&</span> <a name="idm45243674857648-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">&&</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-1.3.30.9.9.4.4.4"></a><h3> 132<a name="idm45243674887920-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="idm45243674887360-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="idm45243674886208-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="idm45243674884784-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="idm45243674883360-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="idm45243674882208-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="idm45243674880784-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="idm45243674879360-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">&</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="idm45243674877520-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">&</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="idm45243674875408-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">&</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="idm45243674873312-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">&</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"><</span> <span class="identifier">iterator</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">></span> 158<a name="idm45243674871360-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">&</span> id<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&</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="idm45243674868816-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="idm45243674867664-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="idm45243674866240-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">&</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="idm45243674864240-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">&</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="idm45243674861968-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">&</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 © 2006-2012 Julio M. Merino Vidal, Ilya Sokolov, 176 Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright © 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> 185</div> 186</body> 187</html> 188
