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
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// template <class I1, class I2>
// struct in_fun_result;
#include <algorithm>
#include <cassert>
#include <type_traits>
#include <utility>
#include "MoveOnly.h"
struct A {
explicit A(int);
};
// no implicit conversion
static_assert(!std::is_constructible_v<std::ranges::in_fun_result<A, A>, std::ranges::in_fun_result<int, int>>);
struct B {
B(int);
};
// implicit conversion
static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, std::ranges::in_fun_result<int, int>>);
static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, std::ranges::in_fun_result<int, int>&>);
static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, const std::ranges::in_fun_result<int, int>>);
static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, const std::ranges::in_fun_result<int, int>&>);
struct C {
C(int&);
};
static_assert(!std::is_constructible_v<std::ranges::in_fun_result<C, C>, std::ranges::in_fun_result<int, int>&>);
// has to be convertible via const&
static_assert(std::is_convertible_v<std::ranges::in_fun_result<int, int>&, std::ranges::in_fun_result<long, long>>);
static_assert(std::is_convertible_v<const std::ranges::in_fun_result<int, int>&, std::ranges::in_fun_result<long, long>>);
static_assert(std::is_convertible_v<std::ranges::in_fun_result<int, int>&&, std::ranges::in_fun_result<long, long>>);
static_assert(std::is_convertible_v<const std::ranges::in_fun_result<int, int>&&, std::ranges::in_fun_result<long, long>>);
// should be move constructible
static_assert(std::is_move_constructible_v<std::ranges::in_fun_result<MoveOnly, int>>);
static_assert(std::is_move_constructible_v<std::ranges::in_fun_result<int, MoveOnly>>);
// should not copy constructible with move-only type
static_assert(!std::is_copy_constructible_v<std::ranges::in_fun_result<MoveOnly, int>>);
static_assert(!std::is_copy_constructible_v<std::ranges::in_fun_result<int, MoveOnly>>);
struct NotConvertible {};
// conversions should not work if there is no conversion
static_assert(!std::is_convertible_v<std::ranges::in_fun_result<NotConvertible, int>, std::ranges::in_fun_result<int, int>>);
static_assert(!std::is_convertible_v<std::ranges::in_fun_result<int, NotConvertible>, std::ranges::in_fun_result<int, int>>);
template <class T>
struct ConvertibleFrom {
constexpr ConvertibleFrom(T c) : content{c} {}
T content;
};
constexpr bool test() {
{
std::ranges::in_fun_result<int, double> res{10, 0.};
assert(res.in == 10);
assert(res.fun == 0.);
std::ranges::in_fun_result<ConvertibleFrom<int>, ConvertibleFrom<double>> res2 = res;
assert(res2.in.content == 10);
assert(res2.fun.content == 0.);
}
{
std::ranges::in_fun_result<MoveOnly, int> res{MoveOnly{}, 2};
assert(res.in.get() == 1);
assert(res.fun == 2);
auto res2 = static_cast<std::ranges::in_fun_result<MoveOnly, int>>(std::move(res));
assert(res.in.get() == 0);
assert(res2.in.get() == 1);
assert(res2.fun == 2);
}
{
auto [in, fun] = std::ranges::in_fun_result<int, int>{1, 2};
assert(in == 1);
assert(fun == 2);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
