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 
7 #include <boost/program_options.hpp>
8 using namespace boost::program_options;
9 
10 #include <iostream>
11 using namespace std;
12 
13 /* Auxiliary functions for checking input for validity. */
14 
15 /* Function used to check that 'opt1' and 'opt2' are not specified
16    at the same time. */
conflicting_options(const variables_map & vm,const char * opt1,const char * opt2)17 void conflicting_options(const variables_map& vm,
18                          const char* opt1, const char* opt2)
19 {
20     if (vm.count(opt1) && !vm[opt1].defaulted()
21         && vm.count(opt2) && !vm[opt2].defaulted())
22         throw logic_error(string("Conflicting options '")
23                           + opt1 + "' and '" + opt2 + "'.");
24 }
25 
26 /* Function used to check that of 'for_what' is specified, then
27    'required_option' is specified too. */
option_dependency(const variables_map & vm,const char * for_what,const char * required_option)28 void option_dependency(const variables_map& vm,
29                         const char* for_what, const char* required_option)
30 {
31     if (vm.count(for_what) && !vm[for_what].defaulted())
32         if (vm.count(required_option) == 0 || vm[required_option].defaulted())
33             throw logic_error(string("Option '") + for_what
34                               + "' requires option '" + required_option + "'.");
35 }
36 
main(int argc,char * argv[])37 int main(int argc, char* argv[])
38 {
39     try {
40         string ofile;
41         string macrofile, libmakfile;
42         bool t_given = false;
43         bool b_given = false;
44         string mainpackage;
45         string depends = "deps_file";
46         string sources = "src_file";
47         string root = ".";
48 
49         options_description desc("Allowed options");
50         desc.add_options()
51         // First parameter describes option name/short name
52         // The second is parameter to option
53         // The third is description
54         ("help,h", "print usage message")
55         ("output,o", value(&ofile), "pathname for output")
56         ("macrofile,m", value(&macrofile), "full pathname of macro.h")
57         ("two,t", bool_switch(&t_given), "preprocess both header and body")
58         ("body,b", bool_switch(&b_given), "preprocess body in the header context")
59         ("libmakfile,l", value(&libmakfile),
60              "write include makefile for library")
61         ("mainpackage,p", value(&mainpackage),
62              "output dependency information")
63         ("depends,d", value(&depends),
64          "write dependencies to <pathname>")
65         ("sources,s", value(&sources), "write source package list to <pathname>")
66         ("root,r", value(&root), "treat <dirname> as project root directory")
67         ;
68 
69         variables_map vm;
70         store(parse_command_line(argc, argv, desc), vm);
71 
72         if (vm.count("help")) {
73             cout << desc << "\n";
74             return 0;
75         }
76 
77         conflicting_options(vm, "output", "two");
78         conflicting_options(vm, "output", "body");
79         conflicting_options(vm, "output", "mainpackage");
80         conflicting_options(vm, "two", "mainpackage");
81         conflicting_options(vm, "body", "mainpackage");
82 
83         conflicting_options(vm, "two", "body");
84         conflicting_options(vm, "libmakfile", "mainpackage");
85         conflicting_options(vm, "libmakfile", "mainpackage");
86 
87         option_dependency(vm, "depends", "mainpackage");
88         option_dependency(vm, "sources", "mainpackage");
89         option_dependency(vm, "root", "mainpackage");
90 
91         cout << "two = " << vm["two"].as<bool>() << "\n";
92     }
93     catch(exception& e) {
94         cerr << e.what() << "\n";
95     }
96 }
97