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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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*
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* This file is a part of LEMON, a generic C++ optimization library.
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*
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* Copyright (C) 2003-2009
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* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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* (Egervary Research Group on Combinatorial Optimization, EGRES).
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*
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* Permission to use, modify and distribute this software is granted
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* provided that this copyright notice appears in all copies. For
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* precise terms see the accompanying LICENSE file.
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*
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* This software is provided "AS IS" with no warranty of any kind,
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* express or implied, and with no claim as to its suitability for any
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* purpose.
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*
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*/
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///\ingroup demos
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///\file
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///\brief Argument parser demo
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///
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/// This example shows how the argument parser can be used.
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///
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/// \include arg_parser_demo.cc
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#include <lemon/arg_parser.h>
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using namespace lemon;
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int main(int argc, char **argv)
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{
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// Initialize the argument parser
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ArgParser ap(argc, argv);
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int i;
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std::string s;
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double d = 1.0;
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bool b, nh;
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bool g1, g2, g3;
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// Add a mandatory integer option with storage reference
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ap.refOption("n", "An integer input.", i, true);
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// Add a double option with storage reference (the default value is 1.0)
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ap.refOption("val", "A double input.", d);
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// Add a double option without storage reference (the default value is 3.14)
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ap.doubleOption("val2", "A double input.", 3.14);
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// Set synonym for -val option
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ap.synonym("vals", "val");
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// Add a string option
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ap.refOption("name", "A string input.", s);
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// Add bool options
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ap.refOption("f", "A switch.", b)
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.refOption("nohelp", "", nh)
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.refOption("gra", "Choice A", g1)
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.refOption("grb", "Choice B", g2)
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.refOption("grc", "Choice C", g3);
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// Bundle -gr* options into a group
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ap.optionGroup("gr", "gra")
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.optionGroup("gr", "grb")
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.optionGroup("gr", "grc");
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// Set the group mandatory
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ap.mandatoryGroup("gr");
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// Set the options of the group exclusive (only one option can be given)
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ap.onlyOneGroup("gr");
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// Add non-parsed arguments (e.g. input files)
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ap.other("infile", "The input file.")
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.other("...");
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// Throw an exception when problems occurs. The default behavior is to
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// exit(1) on these cases, but this makes Valgrind falsely warn
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// about memory leaks.
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ap.throwOnProblems();
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// Perform the parsing process
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// (in case of any error it terminates the program)
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// The try {} construct is necessary only if the ap.trowOnProblems()
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// setting is in use.
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try {
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ap.parse();
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} catch (ArgParserException &) { return 1; }
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// Check each option if it has been given and print its value
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std::cout << "Parameters of '" << ap.commandName() << "':\n";
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std::cout << " Value of -n: " << i << std::endl;
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if(ap.given("val")) std::cout << " Value of -val: " << d << std::endl;
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if(ap.given("val2")) {
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d = ap["val2"];
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std::cout << " Value of -val2: " << d << std::endl;
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}
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if(ap.given("name")) std::cout << " Value of -name: " << s << std::endl;
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if(ap.given("f")) std::cout << " -f is given\n";
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if(ap.given("nohelp")) std::cout << " Value of -nohelp: " << nh << std::endl;
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if(ap.given("gra")) std::cout << " -gra is given\n";
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if(ap.given("grb")) std::cout << " -grb is given\n";
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if(ap.given("grc")) std::cout << " -grc is given\n";
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switch(ap.files().size()) {
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case 0:
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std::cout << " No file argument was given.\n";
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break;
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case 1:
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std::cout << " 1 file argument was given. It is:\n";
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break;
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default:
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std::cout << " "
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<< ap.files().size() << " file arguments were given. They are:\n";
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}
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for(unsigned int i=0;i<ap.files().size();++i)
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std::cout << " '" << ap.files()[i] << "'\n";
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return 0;
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}
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