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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 <cmath> | |
9 | #include <boost/detail/lightweight_test.hpp> | |
10 | #include <boost/phoenix/core.hpp> | |
11 | #include <boost/phoenix/operator.hpp> | |
12 | #include <boost/phoenix/function.hpp> | |
13 | ||
14 | using namespace boost::phoenix; | |
15 | using namespace boost::phoenix::arg_names; | |
16 | using namespace std; | |
17 | ||
18 | struct test_impl | |
19 | { | |
20 | typedef void result_type; | |
21 | void operator()() const | |
22 | { | |
23 | cout << "Test lazy functions...\n"; | |
24 | } | |
25 | }; | |
26 | ||
27 | function<test_impl> test; | |
28 | ||
29 | struct sqr_impl | |
30 | { | |
31 | template <typename Arg> | |
32 | struct result | |
33 | { | |
34 | typedef Arg type; | |
35 | }; | |
36 | ||
37 | template <typename Arg> | |
38 | Arg operator()(Arg n) const | |
39 | { | |
40 | return n * n; | |
41 | } | |
42 | }; | |
43 | ||
44 | function<sqr_impl> sqr; | |
45 | ||
46 | struct fact_impl | |
47 | { | |
48 | template <typename Arg> | |
49 | struct result | |
50 | { | |
51 | typedef Arg type; | |
52 | }; | |
53 | ||
54 | template <typename Arg> | |
55 | Arg operator()(Arg n) const | |
56 | { | |
57 | return (n <= 0) ? 1 : n * (*this)(n-1); | |
58 | } | |
59 | }; | |
60 | ||
61 | function<fact_impl> fact; | |
62 | ||
63 | struct pow_impl | |
64 | { | |
65 | template <typename Arg1, typename Arg2> | |
66 | struct result | |
67 | { | |
68 | typedef Arg1 type; | |
69 | }; | |
70 | ||
71 | template <typename Arg1, typename Arg2> | |
72 | Arg1 operator()(Arg1 a, Arg2 b) const | |
73 | { | |
74 | return pow(a, b); | |
75 | } | |
76 | }; | |
77 | ||
78 | function<pow_impl> power; | |
79 | ||
80 | struct add_impl | |
81 | { | |
82 | template <typename Arg1, typename Arg2, typename Arg3, typename Arg4> | |
83 | struct result | |
84 | { | |
85 | typedef Arg1 type; | |
86 | }; | |
87 | ||
88 | template <typename Arg1, typename Arg2, typename Arg3, typename Arg4> | |
89 | Arg1 operator()(Arg1 a, Arg2 b, Arg3 c, Arg4 d) const | |
90 | { | |
91 | return a + b + c + d; | |
92 | } | |
93 | }; | |
94 | ||
95 | function<add_impl> add; | |
96 | ||
97 | int | |
98 | main() | |
99 | { | |
100 | int i5 = 5; | |
101 | double d5 = 5, d3 = 3; | |
102 | ||
103 | test()(); | |
104 | BOOST_TEST(sqr(arg1)(i5) == (i5*i5)); | |
105 | BOOST_TEST(fact(4)() == 24); | |
106 | BOOST_TEST(fact(arg1)(i5) == 120); | |
107 | BOOST_TEST((int)power(arg1, arg2)(d5, d3) == (int)pow(d5, d3)); | |
108 | BOOST_TEST((sqr(arg1) + 5)(i5) == ((i5*i5)+5)); | |
109 | BOOST_TEST(add(arg1, arg1, arg1, arg1)(i5) == (5+5+5+5)); | |
110 | ||
111 | int const ic5 = 5; | |
112 | // testing consts | |
113 | BOOST_TEST(sqr(arg1)(ic5) == (ic5*ic5)); | |
114 | ||
115 | return boost::report_errors(); | |
116 | } |