1 // ----------------------------------------------------------------------------
2 // Copyright (C) 2002-2006 Marcin Kalicinski
3 //
4 // Distributed under the Boost Software License, Version 1.0.
5 // (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
7 //
8 // For more information, see www.boost.org
9 // ----------------------------------------------------------------------------
10
11 // This example shows what need to be done to customize data_type of ptree.
12 //
13 // It creates my_ptree type, which is a basic_ptree having boost::any as its data
14 // container (instead of std::string that standard ptree has).
15
16 #include <boost/property_tree/ptree.hpp>
17 #include <boost/any.hpp>
18 #include <list>
19 #include <string>
20 #include <iostream>
21
22 // Custom translator that works with boost::any instead of std::string
23 template <class Ext, class Int = boost::any>
24 struct variant_translator
25 {
26 typedef Ext external_type;
27 typedef Int internal_type;
28
29 external_type
get_valuevariant_translator30 get_value(const internal_type &value) const
31 {
32 return boost::any_cast<external_type>(value);
33 }
34 internal_type
put_valuevariant_translator35 put_value(const external_type &value) const
36 {
37 return value;
38 }
39 };
40
main()41 int main()
42 {
43
44 using namespace boost::property_tree;
45
46 // Property_tree with boost::any as data type
47 // Key type: std::string
48 // Data type: boost::any
49 // Key comparison: default (std::less<std::string>)
50 typedef basic_ptree<std::string, boost::any> my_ptree;
51 my_ptree pt;
52
53 // Put/get int value
54 typedef variant_translator<int> int_tran;
55 pt.put("int value", 3, int_tran());
56 int int_value = pt.get<int>("int value", int_tran());
57 std::cout << "Int value: " << int_value << "\n";
58
59 // Put/get string value
60 typedef variant_translator<std::string> string_tran;
61 pt.put<std::string>("string value", "foo bar", string_tran());
62 std::string string_value = pt.get<std::string>(
63 "string value"
64 , string_tran()
65 );
66 std::cout << "String value: " << string_value << "\n";
67
68 // Put/get list<int> value
69 typedef std::list<int> intlist;
70 typedef variant_translator<intlist> intlist_tran;
71 int list_data[] = { 1, 2, 3, 4, 5 };
72 pt.put<intlist>(
73 "list value"
74 , intlist(
75 list_data
76 , list_data + sizeof(list_data) / sizeof(*list_data)
77 )
78 , intlist_tran()
79 );
80 intlist list_value = pt.get<intlist>(
81 "list value"
82 , intlist_tran()
83 );
84 std::cout << "List value: ";
85 for (intlist::iterator it = list_value.begin(); it != list_value.end(); ++it)
86 std::cout << *it << ' ';
87 std::cout << '\n';
88 }
89