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
8#include <iostream>
9#include <cmath>
10#include <boost/detail/lightweight_test.hpp>
11#include <boost/phoenix/core.hpp>
12#include <boost/phoenix/operator.hpp>
13#include <boost/phoenix/function.hpp>
14
15#define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
16#include <boost/mpl/multiplies.hpp>
17#undef BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
18
19struct test_impl
20{
21 typedef void result_type;
22 void operator()() const
23 {
24 std::cout << "Test lazy functions...\n";
25 }
26};
27
28boost::phoenix::function<test_impl> test;
29
30struct sqr_impl
31{
32 template <typename Signature>
33 struct result;
34
35 template <typename This, typename Arg>
36 struct result<This(Arg)>
37 {
38 typedef typename boost::remove_reference<Arg>::type type;
39 };
40
41 template <typename Arg>
42 Arg
43 operator()(Arg n) const
44 {
45 return n * n;
46 }
47};
48
49boost::phoenix::function<sqr_impl> sqr;
50
51struct fact_impl
52{
53 template <typename Signature>
54 struct result;
55
56 template <typename This, typename Arg>
57 struct result<This(Arg)>
58 {
59 typedef typename boost::remove_reference<Arg>::type type;
60 };
61
62 template <typename Arg>
63 Arg
64 operator()(Arg n) const
65 {
66 return (n <= 0) ? 1 : n * (*this)(n-1);
67 }
68};
69
70boost::phoenix::function<fact_impl> fact;
71
72struct pow_impl
73{
74
75 template <typename Sig>
76 struct result;
77
78 template <typename This, typename Arg1, typename Arg2>
79 struct result<This(Arg1, Arg2)>
80 {
81 typedef typename boost::remove_reference<Arg1>::type type;
82 };
83
84 template <typename Arg1, typename Arg2>
85 Arg1
86 operator()(Arg1 a, Arg2 b) const
87 {
88 return std::pow(a, b);
89 }
90};
91
92boost::phoenix::function<pow_impl> power;
93
94struct add_impl
95{
96 template <typename Sig>
97 struct result;
98
99 template <typename This, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
100 struct result<This(Arg1, Arg2, Arg3, Arg4)>
101 {
102 typedef typename boost::remove_reference<Arg1>::type type;
103 };
104
105 template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
106 Arg1
107 operator()(Arg1 a, Arg2 b, Arg3 c, Arg4 d) const
108 {
109 return a + b + c + d;
110 }
111};
112
113boost::phoenix::function<add_impl> add;
114
115int
116main()
117{
118 using boost::phoenix::arg_names::arg1;
119 using boost::phoenix::arg_names::arg2;
120
121 int i5 = 5;
122 double d5 = 5, d3 = 3;
123
124 test()();
125 BOOST_TEST(sqr(arg1)(i5) == (i5*i5));
126 BOOST_TEST(fact(4)() == 24);
127 BOOST_TEST(fact(arg1)(i5) == 120);
128 BOOST_TEST((int)power(arg1, arg2)(d5, d3) == (int)std::pow(d5, d3));
129 BOOST_TEST((sqr(arg1) + 5)(i5) == ((i5*i5)+5));
130 BOOST_TEST(add(arg1, arg1, arg1, arg1)(i5) == (5+5+5+5));
131
132 // testing composition
133 BOOST_TEST(add(arg1, arg1, arg1, power(arg1, 2))(d5) == (5+5+5+25));
134
135 int const ic5 = 5;
136 // testing consts
137 BOOST_TEST(sqr(arg1)(ic5) == (ic5*ic5));
138
139 return boost::report_errors();
140}
141

source code of boost/libs/phoenix/test/function/function_tests.cpp