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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// { dg-do run { target c++26 } }
#include <functional>
#include <utility>
#include <testsuite_hooks.h>
using std::nontype;
using std::function_ref;
using std::is_same_v;
using std::is_invocable_v;
using std::is_nothrow_invocable_v;
using std::invoke_result_t;
// Check return types
static_assert( is_same_v<void, invoke_result_t<function_ref<void()>>> );
static_assert( is_same_v<int, invoke_result_t<function_ref<int()>>> );
static_assert( is_same_v<int&, invoke_result_t<function_ref<int&()>>> );
// Const qualier applies to target object
static_assert( is_invocable_v< function_ref<void()> const > );
static_assert( is_invocable_v< function_ref<void()> const &> );
static_assert( is_invocable_v< function_ref<void() const> > );
static_assert( is_invocable_v< function_ref<void() const> &> );
static_assert( is_invocable_v< function_ref<void() const> const > );
static_assert( is_invocable_v< function_ref<void() const> const &> );
// With noexcept-specifier
static_assert( ! is_nothrow_invocable_v< function_ref<void()> > );
static_assert( ! is_nothrow_invocable_v< function_ref<void() noexcept(false)> > );
static_assert( is_nothrow_invocable_v< function_ref<void() noexcept> > );
void
test01()
{
struct F
{
int operator()() { return 0; }
int operator()() const { return 1; }
};
function_ref<int()> f0{F{}};
VERIFY( f0() == 0 );
VERIFY( std::move(f0)() == 0 );
function_ref<int()> f1{nontype<F{}>};
VERIFY( f1() == 1 );
VERIFY( std::move(f1)() == 1 );
function_ref<int() const> f2{F{}};
VERIFY( f2() == 1 );
VERIFY( std::as_const(f2)() == 1 );
VERIFY( std::move(f2)() == 1 );
VERIFY( std::move(std::as_const(f2))() == 1 );
function_ref<int() const> f3{nontype<F{}>};
VERIFY( f3() == 1 );
VERIFY( std::as_const(f3)() == 1 );
VERIFY( std::move(f3)() == 1 );
VERIFY( std::move(std::as_const(f3))() == 1 );
}
void
test02()
{
struct F
{
struct Arg {};
int operator()(Arg& arg) const { return 0; }
int operator()(const Arg& arg) const { return 1; }
};
F::Arg arg;
function_ref<int()> f0{std::nontype<F{}>, arg};
VERIFY( f0() == 0 );
VERIFY( std::move(f0)() == 0 );
function_ref<int() const> f1{std::nontype<F{}>, arg};
VERIFY( f1() == 1 );
VERIFY( std::as_const(f1)() == 1 );
}
void
test03()
{
struct F
{
struct Arg {};
int operator()(Arg* arg) const { return 0; }
int operator()(const Arg* arg) const { return 1; }
};
F::Arg arg;
function_ref<int()> f0{std::nontype<F{}>, &arg};
VERIFY( f0() == 0 );
VERIFY( std::move(f0)() == 0 );
function_ref<int() const> f1{std::nontype<F{}>, &arg};
VERIFY( f1() == 1 );
VERIFY( std::as_const(f1)() == 1 );
}
void
test04()
{
constexpr int (*fp)() = [] { return 0; };
function_ref<int()> f0{fp};
VERIFY( f0() == 0 );
VERIFY( std::move(f0)() == 0 );
function_ref<int()> f1{nontype<fp>};
VERIFY( f1() == 0 );
VERIFY( std::move(f1)() == 0 );
const function_ref<int() const> f2{fp};
VERIFY( f2() == 0 );
VERIFY( std::move(f2)() == 0 );
const function_ref<int() const> f3{nontype<fp>};
VERIFY( f2() == 0 );
VERIFY( std::move(f2)() == 0 );
}
using ftype = int(int);
int twice(int x) { return x * 2; }
int cube(int x) { return x * x * x; }
int callback_ptr(ftype* f, int x) { return f(x); }
int callback_ref(ftype& f, int x) { return f(x); }
void
test05()
{
function_ref<int(int)> r1(nontype<&callback_ptr>, &twice);
VERIFY( r1(2) == 4 );
function_ref<int(int)> r2(nontype<&callback_ptr>, cube);
VERIFY( r2(2) == 8 );
function_ref<int(int)> r3(nontype<&callback_ref>, twice);
VERIFY( r3(3) == 6 );
function_ref<int(int)> r4(nontype<&callback_ref>, cube);
VERIFY( r4(3) == 27 );
// Checks if distinction between reference and pointer
// is preserved.
struct F
{
static
int operator()(ftype* f, int x)
{ return f(x) + 1000; }
static
int operator()(ftype& f, int x)
{ return f(x) + 2000; }
};
function_ref<int(int)> r5(nontype<F{}>, &twice);
VERIFY( r5(2) == 1004 );
function_ref<int(int)> r6(nontype<F{}>, twice);
VERIFY( r6(2) == 2008 );
function_ref<int(int)> r7(nontype<F{}>, &cube);
VERIFY( r7(3) == 1006 );
function_ref<int(int)> r8(nontype<F{}>, cube);
VERIFY( r8(3) == 2027 );
}
struct Incomplete;
enum CompleteEnum : int;
void
test_params()
{
auto f = [](auto&&) {};
std::function_ref<void(Incomplete&)> f1(f);
// See PR libstdc++/120259, this should be supported.
// std::function_ref<void(Incomplete&&)> f2(f);
std::function_ref<void(CompleteEnum)> f3(f);
}
int main()
{
test01();
test02();
test03();
test04();
test_params();
}
|
