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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
//===----------------------------------------------------------------------===//
//
// 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
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// template<input_range V, forward_range Pattern>
// requires view<V> && view<Pattern> &&
// indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> &&
// (forward_range<V> || tiny-range<Pattern>)
// class lazy_split_view;
#include <functional>
#include <ranges>
#include "test_iterators.h"
#include "types.h"
struct ForwardRange {
forward_iterator<int*> begin() const;
forward_iterator<int*> end() const;
};
static_assert( std::ranges::forward_range<ForwardRange>);
template <class View, class Pattern>
concept CanInstantiate = requires {
typename std::ranges::lazy_split_view<View, Pattern>;
};
// All constraints satisfied (`View` and `Pattern` are forward views).
namespace test1 {
using View = ForwardView;
using Pattern = ForwardView;
static_assert( std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert( CanInstantiate<View, Pattern>);
} // namespace test1
// All constraints satisfied (`View` is an input view and `Pattern` is a tiny view).
namespace test2 {
using View = InputView;
using Pattern = ForwardTinyView;
static_assert( std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert( CanInstantiate<View, Pattern>);
} // namespace test2
// `View` is not an input range.
namespace test3 {
struct AlmostInputIterator {
using value_type = char;
using difference_type = ptrdiff_t;
using iterator_concept = int;
constexpr const char& operator*() const;
constexpr AlmostInputIterator& operator++();
constexpr void operator++(int);
constexpr bool operator==(const AlmostInputIterator&) const;
};
static_assert( std::input_or_output_iterator<AlmostInputIterator>);
static_assert(!std::input_iterator<AlmostInputIterator>);
struct NonInputView : std::ranges::view_base {
AlmostInputIterator begin() const;
AlmostInputIterator end() const;
};
using View = NonInputView;
using Pattern = ForwardTinyView;
static_assert(!std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test3
// `View` is not a view.
namespace test4 {
using View = ForwardRange;
using Pattern = ForwardView;
static_assert( std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert(!std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test4
// `Pattern` is not a forward range.
namespace test5 {
using View = ForwardView;
using Pattern = InputView;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test5
// Not indirectly comparable.
namespace test6 {
struct Empty{};
struct IntForwardView : std::ranges::view_base {
constexpr forward_iterator<Empty*> begin() const { return {}; }
constexpr forward_iterator<Empty*> end() const { return {}; }
};
using View = ForwardView;
using Pattern = IntForwardView;
static_assert( std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert(!std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test6
// `View` is an input range and `Pattern` is not a tiny range.
namespace test7 {
using View = InputView;
using Pattern = ForwardView;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
LIBCPP_STATIC_ASSERT(!std::ranges::__tiny_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test7
// `View` is an input range and `Pattern` is almost a tiny range, except the `size()` function is not `constexpr`.
namespace test8 {
struct AlmostTinyRange : std::ranges::view_base {
int* begin() const;
int* end() const;
static size_t size() { return 1; }
};
using View = InputView;
using Pattern = AlmostTinyRange;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
LIBCPP_STATIC_ASSERT(!std::ranges::__tiny_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test8
// `View` is an input range and `Pattern` is almost a tiny range, except the `size()` returns a number `>2`.
namespace test9 {
struct AlmostTinyRange : std::ranges::view_base {
int* begin() const;
int* end() const;
constexpr static size_t size() { return 2; }
};
using View = InputView;
using Pattern = ForwardView;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
LIBCPP_STATIC_ASSERT(!std::ranges::__tiny_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test9
|
