1 /*=============================================================================
2 Copyright (c) 2001-2010 Joel de Guzman
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 =============================================================================*/
7 #include <boost/config/warning_disable.hpp>
8 #include <boost/spirit/include/qi.hpp>
9 #include <boost/lambda/lambda.hpp>
10 #include <boost/bind.hpp>
11
12 #include <iostream>
13
14 // Presented are various ways to attach semantic actions
15 // * Using plain function pointer
16 // * Using simple function object
17 // * Using boost.bind with a plain function
18 // * Using boost.bind with a member function
19 // * Using boost.lambda
20
21 //[tutorial_semantic_action_functions
22 namespace client
23 {
24 namespace qi = boost::spirit::qi;
25
26 // A plain function
print(int const & i)27 void print(int const& i)
28 {
29 std::cout << i << std::endl;
30 }
31
32 // A member function
33 struct writer
34 {
printclient::writer35 void print(int const& i) const
36 {
37 std::cout << i << std::endl;
38 }
39 };
40
41 // A function object
42 struct print_action
43 {
operator ()client::print_action44 void operator()(int const& i, qi::unused_type, qi::unused_type) const
45 {
46 std::cout << i << std::endl;
47 }
48 };
49 }
50 //]
51
main()52 int main()
53 {
54 using boost::spirit::qi::int_;
55 using boost::spirit::qi::parse;
56 using client::print;
57 using client::writer;
58 using client::print_action;
59
60 { // example using plain function
61
62 char const *first = "{42}", *last = first + std::strlen(first);
63 //[tutorial_attach_actions1
64 parse(first, last, '{' >> int_[&print] >> '}');
65 //]
66 }
67
68 { // example using simple function object
69
70 char const *first = "{43}", *last = first + std::strlen(first);
71 //[tutorial_attach_actions2
72 parse(first, last, '{' >> int_[print_action()] >> '}');
73 //]
74 }
75
76 { // example using boost.bind with a plain function
77
78 char const *first = "{44}", *last = first + std::strlen(first);
79 //[tutorial_attach_actions3
80 parse(first, last, '{' >> int_[boost::bind(&print, _1)] >> '}');
81 //]
82 }
83
84 { // example using boost.bind with a member function
85
86 char const *first = "{44}", *last = first + std::strlen(first);
87 //[tutorial_attach_actions4
88 writer w;
89 parse(first, last, '{' >> int_[boost::bind(&writer::print, &w, _1)] >> '}');
90 //]
91 }
92
93 { // example using boost.lambda
94
95 namespace lambda = boost::lambda;
96 char const *first = "{45}", *last = first + std::strlen(first);
97 using lambda::_1;
98 //[tutorial_attach_actions5
99 parse(first, last, '{' >> int_[std::cout << _1 << '\n'] >> '}');
100 //]
101 }
102
103 return 0;
104 }
105
106
107
108
109