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(¯ofile), "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