comma.cpp
2.81 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
// Copyright (C) 2016-2018 T. Zachary Laine
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/yap/expression.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/core/lightweight_test.hpp>
#include <sstream>
template<typename T>
using term = boost::yap::terminal<boost::yap::expression, T>;
template<typename T>
using term_ref = boost::yap::expression_ref<boost::yap::expression, term<T> &>;
template<typename T>
using term_cref =
boost::yap::expression_ref<boost::yap::expression, term<T> const &>;
namespace yap = boost::yap;
namespace bh = boost::hana;
struct void_callable
{
void operator()() { *called_ = (*call_count_)++; }
int * call_count_;
int * called_;
};
struct int_callable
{
int operator()()
{
*called_ = (*call_count_)++;
return 42;
}
int * call_count_;
int * called_;
};
struct double_callable
{
double operator()()
{
*called_ = (*call_count_)++;
return 13.0;
}
int * call_count_;
int * called_;
};
int main()
{
{
{
int call_count = 0;
int int_called = -1;
int double_called = -1;
auto int_double_expr =
(term<int_callable>{{&call_count, &int_called}}(),
term<double_callable>{{&call_count, &double_called}}());
BOOST_TEST(evaluate(int_double_expr) == 13.0);
BOOST_TEST(int_called == 0);
BOOST_TEST(double_called == 1);
}
{
int call_count = 0;
int int_called = -1;
int double_called = -1;
auto double_int_expr =
(term<double_callable>{{&call_count, &double_called}}(),
term<int_callable>{{&call_count, &int_called}}());
BOOST_TEST(evaluate(double_int_expr) == 42);
BOOST_TEST(int_called == 1);
BOOST_TEST(double_called == 0);
}
}
{
{
int call_count = 0;
int void_called = -1;
int int_called = -1;
auto void_int_expr =
(term<void_callable>{{&call_count, &void_called}}(),
term<int_callable>{{&call_count, &int_called}}());
BOOST_TEST(evaluate(void_int_expr) == 42);
BOOST_TEST(void_called == 0);
BOOST_TEST(int_called == 1);
}
{
int call_count = 0;
int void_called = -1;
int int_called = -1;
auto int_void_expr =
(term<int_callable>{{&call_count, &int_called}}(),
term<void_callable>{{&call_count, &void_called}}());
using eval_type = decltype(evaluate(int_void_expr));
BOOST_MPL_ASSERT(
(std::is_same<void, eval_type>));
evaluate(int_void_expr);
BOOST_TEST(void_called == 1);
BOOST_TEST(int_called == 0);
}
}
return boost::report_errors();
}