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
|
//===----------------------------------------------------------------------===//
//
// 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, c++20
// <ranges>
// Check constraints on the type itself.
//
// template <forward_range View, indirect_binary_predicate<iterator_t<View>, iterator_t<View>> Pred>
// requires view<View> && is_object_v<Pred>
// class chunk_by_view;
#include <ranges>
#include <concepts>
#include <cstddef>
#include <iterator>
#include <type_traits>
#include "almost_satisfies_types.h"
#include "test_iterators.h"
template <class View, class Pred>
concept CanFormChunkByView = requires { typename std::ranges::chunk_by_view<View, Pred>; };
// chunk_by_view is not valid when the view is not a forward_range
namespace test_when_view_is_not_a_forward_range {
struct View : std::ranges::view_base {
ForwardIteratorNotDerivedFrom begin() const;
ForwardIteratorNotDerivedFrom end() const;
};
struct Pred {
bool operator()(int, int) const;
};
static_assert(!std::ranges::forward_range<View>);
static_assert(std::indirect_binary_predicate<Pred, int*, int*>);
static_assert(std::ranges::view<View>);
static_assert(std::is_object_v<Pred>);
static_assert(!CanFormChunkByView<View, Pred>);
} // namespace test_when_view_is_not_a_forward_range
// chunk_by_view is not valid when the predicate is not indirect_binary_predicate
namespace test_when_the_predicate_is_not_indirect_binary_predicate {
struct View : std::ranges::view_base {
int* begin() const;
int* end() const;
};
struct Pred {};
static_assert(std::ranges::forward_range<View>);
static_assert(!std::indirect_binary_predicate<Pred, int*, int*>);
static_assert(std::ranges::view<View>);
static_assert(std::is_object_v<Pred>);
static_assert(!CanFormChunkByView<View, Pred>);
} // namespace test_when_the_predicate_is_not_indirect_binary_predicate
// chunk_by_view is not valid when the view is not a view
namespace test_when_the_view_param_is_not_a_view {
struct View {
int* begin() const;
int* end() const;
};
struct Pred {
bool operator()(int, int) const;
};
static_assert(std::ranges::input_range<View>);
static_assert(std::indirect_binary_predicate<Pred, int*, int*>);
static_assert(!std::ranges::view<View>);
static_assert(std::is_object_v<Pred>);
static_assert(!CanFormChunkByView<View, Pred>);
} // namespace test_when_the_view_param_is_not_a_view
// chunk_by_view is not valid when the predicate is not an object type
namespace test_when_the_predicate_is_not_an_object_type {
struct View : std::ranges::view_base {
int* begin() const;
int* end() const;
};
using Pred = bool (&)(int, int);
static_assert(std::ranges::input_range<View>);
static_assert(std::indirect_binary_predicate<Pred, int*, int*>);
static_assert(std::ranges::view<View>);
static_assert(!std::is_object_v<Pred>);
static_assert(!CanFormChunkByView<View, Pred>);
} // namespace test_when_the_predicate_is_not_an_object_type
// chunk_by_view is valid when all the constraints are satisfied (test the test)
namespace test_when_all_the_constraints_are_satisfied {
struct View : std::ranges::view_base {
int* begin() const;
int* end() const;
};
struct Pred {
bool operator()(int, int) const;
};
static_assert(std::ranges::input_range<View>);
static_assert(std::indirect_binary_predicate<Pred, int*, int*>);
static_assert(std::ranges::view<View>);
static_assert(std::is_object_v<Pred>);
static_assert(CanFormChunkByView<View, Pred>);
} // namespace test_when_all_the_constraints_are_satisfied
|
