1 // Copyright Vladimir Prus 2002-2004.
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE_1_0.txt
4 // or copy at http://www.boost.org/LICENSE_1_0.txt)
5
6 #include <boost/program_options.hpp>
7
8 using namespace boost;
9 namespace po = boost::program_options;
10
11 #include <iostream>
12 #include <algorithm>
13 #include <iterator>
14 using namespace std;
15
16
17 // A helper function to simplify the main part.
18 template<class T>
operator <<(ostream & os,const vector<T> & v)19 ostream& operator<<(ostream& os, const vector<T>& v)
20 {
21 copy(v.begin(), v.end(), ostream_iterator<T>(os, " "));
22 return os;
23 }
24
main(int ac,char * av[])25 int main(int ac, char* av[])
26 {
27 try {
28 int opt;
29 int portnum;
30 po::options_description desc("Allowed options");
31 desc.add_options()
32 ("help", "produce help message")
33 ("optimization", po::value<int>(&opt)->default_value(10),
34 "optimization level")
35 ("verbose,v", po::value<int>()->implicit_value(1),
36 "enable verbosity (optionally specify level)")
37 ("listen,l", po::value<int>(&portnum)->implicit_value(1001)
38 ->default_value(0,"no"),
39 "listen on a port.")
40 ("include-path,I", po::value< vector<string> >(),
41 "include path")
42 ("input-file", po::value< vector<string> >(), "input file")
43 ;
44
45 po::positional_options_description p;
46 p.add("input-file", -1);
47
48 po::variables_map vm;
49 po::store(po::command_line_parser(ac, av).
50 options(desc).positional(p).run(), vm);
51 po::notify(vm);
52
53 if (vm.count("help")) {
54 cout << "Usage: options_description [options]\n";
55 cout << desc;
56 return 0;
57 }
58
59 if (vm.count("include-path"))
60 {
61 cout << "Include paths are: "
62 << vm["include-path"].as< vector<string> >() << "\n";
63 }
64
65 if (vm.count("input-file"))
66 {
67 cout << "Input files are: "
68 << vm["input-file"].as< vector<string> >() << "\n";
69 }
70
71 if (vm.count("verbose")) {
72 cout << "Verbosity enabled. Level is " << vm["verbose"].as<int>()
73 << "\n";
74 }
75
76 cout << "Optimization level is " << opt << "\n";
77
78 cout << "Listen port is " << portnum << "\n";
79 }
80 catch(std::exception& e)
81 {
82 cout << e.what() << "\n";
83 return 1;
84 }
85 return 0;
86 }
87