1 | // Copyright Vladimir Prus 2002-2004.
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2 | // Distributed under the Boost Software License, Version 1.0.
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3 | // (See accompanying file LICENSE_1_0.txt
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4 | // or copy at http://www.boost.org/LICENSE_1_0.txt)
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5 |
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6 | /* Shows how to use both command line and config file. */
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7 |
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8 | #include <boost/program_options.hpp>
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9 | namespace po = boost::program_options;
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10 |
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11 |
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12 | #include <iostream>
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13 | #include <fstream>
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14 | #include <iterator>
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15 | using namespace std;
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16 |
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17 | // A helper function to simplify the main part.
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18 | template<class T>
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19 | ostream& operator<<(ostream& os, const vector<T>& v)
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20 | {
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21 | copy(v.begin(), v.end(), ostream_iterator<T>(cout, " "));
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22 | return os;
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23 | }
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24 |
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25 |
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26 | int main(int ac, char* av[])
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27 | {
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28 | try {
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29 | int opt;
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30 | std::string ConfigFile;
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31 |
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32 | // Declare a group of options that will be
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33 | // allowed only on command line
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34 | po::options_description generic("Generic options");
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35 | generic.add_options()
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36 | ("version,v", "print version string")
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37 | ("help", "produce help message")
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38 | ("config,c",po::value<std::string>(&ConfigFile)->default_value("multiple_sources.cfg"),
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39 | "Name of a file of a configuration.")
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40 | ;
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41 |
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42 | // Declare a group of options that will be
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43 | // allowed both on command line and in
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44 | // config file
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45 | po::options_description config("Configuration");
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46 | config.add_options()
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47 | ("optimization", po::value<int>(&opt)->default_value(10),
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48 | "optimization level")
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49 | ("include-path,I",
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50 | po::value< vector<string> >()->composing(),
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51 | "include path")
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52 | ;
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53 |
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54 | // Hidden options, will be allowed both on command line and
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55 | // in config file, but will not be shown to the user.
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56 | po::options_description hidden("Hidden options");
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57 | hidden.add_options()
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58 | ("input-file", po::value< vector<string> >(), "input file")
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59 | ;
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60 |
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61 |
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62 | po::options_description cmdline_options;
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63 | cmdline_options.add(generic).add(config).add(hidden);
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64 |
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65 | po::options_description config_file_options;
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66 | config_file_options.add(config).add(hidden);
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67 |
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68 | po::options_description visible("Allowed options");
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69 | visible.add(generic).add(config);
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70 |
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71 | po::positional_options_description p;
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72 | p.add("input-file", -1);
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73 |
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74 | po::variables_map vm;
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75 | store(po::command_line_parser(ac, av).
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76 | options(cmdline_options).positional(p).run(), vm);
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77 |
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78 | notify(vm);
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79 | ifstream ifs(ConfigFile.c_str());
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80 | if(!ifs)
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81 | {
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82 | cout<<"can not open config file\n";
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83 | return 0;
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84 | }
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85 | else
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86 | {
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87 | store(parse_config_file(ifs, config_file_options), vm);
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88 | notify(vm);
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89 | }
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90 |
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91 | if (vm.count("help")) {
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92 | cout << visible << "\n";
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93 | return 0;
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94 | }
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95 |
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96 | if (vm.count("version")) {
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97 | cout << "Multiple sources example, version 1.0\n";
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98 | return 0;
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99 | }
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100 |
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101 | if (vm.count("include-path"))
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102 | {
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103 | cout << "Include paths are: "
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104 | << vm["include-path"].as< vector<string> >() << "\n";
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105 | }
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106 |
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107 | if (vm.count("input-file"))
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108 | {
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109 | cout << "Input files are: "
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110 | << vm["input-file"].as< vector<string> >() << "\n";
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111 | }
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112 |
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113 | cout << "Optimization level is " << opt << "\n";
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114 | }
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115 | catch(exception& e)
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116 | {
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117 | cout << e.what() << "\n";
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118 | return 1;
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119 | }
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120 | return 0;
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121 | }
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