64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
// Copyright Vladimir Prus 2002-2004.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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/** This example shows how to support custom options syntax.
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It's possible to install 'custom_parser'. It will be invoked on all command
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line tokens and can return name/value pair, or nothing. If it returns
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nothing, usual processing will be done.
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*/
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#include <boost/program_options/options_description.hpp>
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#include <boost/program_options/parsers.hpp>
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#include <boost/program_options/variables_map.hpp>
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using namespace boost::program_options;
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#include <iostream>
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using namespace std;
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/* This custom option parse function recognize gcc-style
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option "-fbar" / "-fno-bar".
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*/
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pair<string, string> reg_foo(const string& s)
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{
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if (s.find("-f") == 0) {
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if (s.substr(2, 3) == "no-")
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return make_pair(s.substr(5), string("false"));
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else
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return make_pair(s.substr(2), string("true"));
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} else {
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return make_pair(string(), string());
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}
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}
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int main(int ac, char* av[])
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{
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try {
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options_description desc("Allowed options");
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desc.add_options()
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("help", "produce a help message")
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("foo", value<string>(), "just an option")
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;
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variables_map vm;
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store(command_line_parser(ac, av).options(desc).extra_parser(reg_foo)
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.run(), vm);
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if (vm.count("help")) {
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cout << desc;
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cout << "\nIn addition -ffoo and -fno-foo syntax are recognized.\n";
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}
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if (vm.count("foo")) {
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cout << "foo value with the value of "
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<< vm["foo"].as<string>() << "\n";
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}
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}
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catch(exception& e) {
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cout << e.what() << "\n";
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}
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}
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