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
|
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <numeric>
// UNSUPPORTED: clang-8
// Became constexpr in C++20
// template <InputIterator Iter, MoveConstructible T,
// Callable<auto, const T&, Iter::reference> BinaryOperation>
// requires HasAssign<T, BinaryOperation::result_type>
// && CopyConstructible<BinaryOperation>
// T
// accumulate(Iter first, Iter last, T init, BinaryOperation binary_op);
#include <numeric>
#include <functional>
#include <string>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
struct rvalue_addable
{
bool correctOperatorUsed = false;
// make sure the predicate is passed an rvalue and an lvalue (so check that the first argument was moved)
constexpr rvalue_addable operator()(rvalue_addable&& r, rvalue_addable const&) {
r.correctOperatorUsed = true;
return std::move(r);
}
};
constexpr rvalue_addable operator+(rvalue_addable& lhs, rvalue_addable const&)
{
lhs.correctOperatorUsed = false;
return lhs;
}
constexpr rvalue_addable operator+(rvalue_addable&& lhs, rvalue_addable const&)
{
lhs.correctOperatorUsed = true;
return std::move(lhs);
}
constexpr void
test_use_move()
{
rvalue_addable arr[100];
auto res1 = std::accumulate(arr, arr + 100, rvalue_addable());
auto res2 = std::accumulate(arr, arr + 100, rvalue_addable(), /*predicate=*/rvalue_addable());
assert(res1.correctOperatorUsed);
assert(res2.correctOperatorUsed);
}
#endif // TEST_STD_VER > 17
// C++20 can use string in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases omit the constexpr test.
// FIXME Remove constexpr string workaround introduced in D90569
#if TEST_STD_VER > 17 && \
(!defined(__cpp_lib_constexpr_string) || __cpp_lib_constexpr_string < 201907L)
void
#else
TEST_CONSTEXPR_CXX20 void
#endif
test_string()
{
std::string sa[] = {"a", "b", "c"};
assert(std::accumulate(sa, sa + 3, std::string()) == "abc");
assert(std::accumulate(sa, sa + 3, std::string(), std::plus<std::string>()) == "abc");
}
template <class Iter, class T>
TEST_CONSTEXPR_CXX20 void
test(Iter first, Iter last, T init, T x)
{
assert(std::accumulate(first, last, init, std::multiplies<T>()) == x);
}
template <class Iter>
TEST_CONSTEXPR_CXX20 void
test()
{
int ia[] = {1, 2, 3, 4, 5, 6};
unsigned sa = sizeof(ia) / sizeof(ia[0]);
test(Iter(ia), Iter(ia), 1, 1);
test(Iter(ia), Iter(ia), 10, 10);
test(Iter(ia), Iter(ia+1), 1, 1);
test(Iter(ia), Iter(ia+1), 10, 10);
test(Iter(ia), Iter(ia+2), 1, 2);
test(Iter(ia), Iter(ia+2), 10, 20);
test(Iter(ia), Iter(ia+sa), 1, 720);
test(Iter(ia), Iter(ia+sa), 10, 7200);
}
TEST_CONSTEXPR_CXX20 bool
test()
{
test<input_iterator<const int*> >();
test<forward_iterator<const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
#if TEST_STD_VER > 17
test_use_move();
#endif // TEST_STD_VER > 17
// C++20 can use string in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases omit the constexpr test.
// FIXME Remove constexpr string workaround introduced in D90569
#if TEST_STD_VER > 17 && \
(!defined(__cpp_lib_constexpr_string) || __cpp_lib_constexpr_string < 201907L)
if (!std::is_constant_evaluated())
#endif
test_string();
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
|
