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
|
/*=============================================================================
Copyright (c) 2001-2012 Joel de Guzman
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/detail/lightweight_test.hpp>
#include <boost/spirit/home/x3.hpp>
#include <boost/fusion/include/std_pair.hpp>
#include <string>
#include <cstring>
#include <iostream>
#include "test.hpp"
using boost::spirit::x3::_val;
struct f
{
template <typename Context>
void operator()(Context const& ctx) const
{
_val(ctx) += _attr(ctx);
}
};
struct stationary : boost::noncopyable
{
explicit stationary(int i) : val{i} {}
stationary& operator=(int i) { val = i; return *this; }
int val;
};
namespace check_stationary {
boost::spirit::x3::rule<class a_r, stationary> const a;
boost::spirit::x3::rule<class b_r, stationary> const b;
auto const a_def = '{' >> boost::spirit::x3::int_ >> '}';
auto const b_def = a;
BOOST_SPIRIT_DEFINE(a, b)
}
int main()
{
using spirit_test::test_attr;
using spirit_test::test;
using namespace boost::spirit::x3::ascii;
using boost::spirit::x3::rule;
using boost::spirit::x3::lit;
using boost::spirit::x3::eps;
using boost::spirit::x3::unused_type;
{ // synth attribute value-init
std::string s;
typedef rule<class r, std::string> rule_type;
auto rdef = rule_type()
= alpha [f()]
;
BOOST_TEST(test_attr("abcdef", +rdef, s));
BOOST_TEST(s == "abcdef");
}
{ // synth attribute value-init
std::string s;
typedef rule<class r, std::string> rule_type;
auto rdef = rule_type() =
alpha /
[](auto& ctx)
{
_val(ctx) += _attr(ctx);
}
;
BOOST_TEST(test_attr("abcdef", +rdef, s));
BOOST_TEST(s == "abcdef");
}
{
auto r = rule<class r, int>{} = eps[([] (auto& ctx) {
using boost::spirit::x3::_val;
static_assert(std::is_same<std::decay_t<decltype(_val(ctx))>, unused_type>::value,
"Attribute must not be synthesized");
})];
BOOST_TEST(test("", r));
}
{ // ensure no unneded synthesization, copying and moving occured
stationary st { 0 };
BOOST_TEST(test_attr("{42}", check_stationary::b, st));
BOOST_TEST_EQ(st.val, 42);
}
return boost::report_errors();
}
|
