1/*=============================================================================
2 Copyright (c) 2001-2007 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 <iostream>
8#include <string>
9#include <cmath>
10
11#include <boost/detail/lightweight_test.hpp>
12#include <boost/phoenix/core.hpp>
13#include <boost/phoenix/operator.hpp>
14#include <boost/phoenix/scope/dynamic.hpp>
15
16struct my_dynamic : ::boost::phoenix::dynamic<int, std::string, double>
17{
18 my_dynamic() : num(init<0>(scope: this)), message(init<1>(scope: this)), real(init<2>(scope: this)) {}
19
20 member1 num;
21 member2 message;
22 member3 real;
23};
24
25// You may also use the macro below to achieve the same as above:
26//
27//BOOST_PHOENIX_DYNAMIC(
28// my_dynamic,
29// (int, num)
30// (std::string, message)
31// (double, real)
32//);
33
34int
35main()
36{
37 using namespace boost::phoenix;
38 using namespace boost::phoenix::arg_names;
39
40 my_dynamic clos;
41
42 { // First stack frame
43 dynamic_frame<my_dynamic::self_type> frame(clos);
44 (clos.num = 123)();
45 (clos.num += 456)();
46 (clos.real = clos.num / 56.5)();
47 (clos.message = "Hello " + std::string("World "))();
48
49 { // Second stack frame
50 dynamic_frame<my_dynamic::self_type> frame(clos);
51 (clos.num = 987)();
52 (clos.message = std::string("Abracadabra "))();
53 (clos.real = clos.num * 1e30)();
54
55 { // Third stack frame
56 boost::phoenix::vector3<int, std::string, double> init = {.a0: -1, .a1: "Direct Init ", .a2: 3.14};
57 dynamic_frame<my_dynamic::self_type> frame(clos, init);
58
59 (std::cout << clos.message << clos.num << ", " << clos.real << '\n')();
60 BOOST_TEST(clos.num() == -1);
61 BOOST_TEST(clos.message() == "Direct Init ");
62 }
63
64 (std::cout << clos.message << clos.num << ", " << clos.real << '\n')();
65 BOOST_TEST(clos.num() == 987);
66 BOOST_TEST(clos.message() == "Abracadabra ");
67 }
68
69 (std::cout << clos.message << clos.num << ", " << clos.real << '\n')();
70 BOOST_TEST(clos.num() == 123+456);
71 BOOST_TEST(clos.message() == "Hello " + std::string("World "));
72 }
73
74 return boost::report_errors();
75}
76

source code of boost/libs/phoenix/test/scope/dynamic_tests.cpp