<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Function parse_environment</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../program_options/reference.html#header.boost.program_options.parsers_hpp" title="Header <boost/program_options/parsers.hpp>"> <link rel="prev" href="collect_unrecognized.html" title="Function template collect_unrecognized"> <link rel="next" href="parse_en_idm45507039007472.html" title="Function parse_environment"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a href="../../../../index.html">Home</a></td> <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="collect_unrecognized.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../program_options/reference.html#header.boost.program_options.parsers_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="parse_en_idm45507039007472.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.program_options.parse_en_idm45506972428912"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Function parse_environment</span></h2> <p>boost::program_options::parse_environment</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <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="../../program_options/reference.html#header.boost.program_options.parsers_hpp" title="Header <boost/program_options/parsers.hpp>">boost/program_options/parsers.hpp</a>> </span> <span class="identifier">BOOST_PROGRAM_OPTIONS_DECL</span> <a class="link" href="../../program_options/reference.html#boost.program_options.parsed_options">parsed_options</a> <span class="identifier">parse_environment</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="options_description.html" title="Class options_description">options_description</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">function1</span><span class="special"><</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">></span> <span class="special">&</span> name_mapper<span class="special">)</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="idm45555215324048"></a><h2>Description</h2> <p>Parse environment.</p> <p>For each environment variable, the 'name_mapper' function is called to obtain the option name. If it returns empty string, the variable is ignored.</p> <p>This is done since naming of environment variables is typically different from the naming of command line options. </p> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2002-2004 Vladimir Prus<p>Distributed under the Boost Software License, Version 1.0. (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="collect_unrecognized.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../program_options/reference.html#header.boost.program_options.parsers_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="parse_en_idm45507039007472.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>