demo/arg_parser_demo.cc
author Peter Kovacs <kpeter@inf.elte.hu>
Tue, 02 Mar 2010 10:03:07 +0100
changeset 934 930ddeafdb20
parent 463 88ed40ad0d4f
child 956 141f9c0db4a3
permissions -rw-r--r--
Add tolerance() functions for HaoOrlin (#306)
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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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}