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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
|
//===----------------------------------------------------------------------===//
//
// 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-no-concepts
// UNSUPPORTED: gcc-10
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// template<class D>
// requires is_class_v<D> && same_as<D, remove_cv_t<D>>
// class view_interface;
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
template<class T>
concept ValidViewInterfaceType = requires { typename std::ranges::view_interface<T>; };
struct Empty { };
static_assert(!ValidViewInterfaceType<void>);
static_assert(!ValidViewInterfaceType<void*>);
static_assert(!ValidViewInterfaceType<Empty*>);
static_assert(!ValidViewInterfaceType<Empty const>);
static_assert(!ValidViewInterfaceType<Empty &>);
static_assert( ValidViewInterfaceType<Empty>);
static_assert(std::derived_from<std::ranges::view_interface<Empty>, std::ranges::view_base>);
using InputIter = cpp20_input_iterator<const int*>;
struct InputRange : std::ranges::view_interface<InputRange> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr InputIter begin() const { return InputIter(buff); }
constexpr InputIter end() const { return InputIter(buff + 8); }
};
struct NotSizedSentinel {
using value_type = int;
using difference_type = std::ptrdiff_t;
using iterator_concept = std::forward_iterator_tag;
explicit NotSizedSentinel() = default;
explicit NotSizedSentinel(int*);
int& operator*() const;
NotSizedSentinel& operator++();
NotSizedSentinel operator++(int);
bool operator==(NotSizedSentinel const&) const;
};
static_assert(std::forward_iterator<NotSizedSentinel>);
using ForwardIter = forward_iterator<int*>;
// So that we conform to sized_sentinel_for.
constexpr std::ptrdiff_t operator-(const ForwardIter& x, const ForwardIter& y) {
return x.base() - y.base();
}
struct ForwardRange : std::ranges::view_interface<ForwardRange> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr ForwardIter begin() const { return ForwardIter(const_cast<int*>(buff)); }
constexpr ForwardIter end() const { return ForwardIter(const_cast<int*>(buff) + 8); }
};
struct MoveOnlyForwardRange : std::ranges::view_interface<MoveOnlyForwardRange> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
MoveOnlyForwardRange(MoveOnlyForwardRange const&) = delete;
MoveOnlyForwardRange(MoveOnlyForwardRange &&) = default;
MoveOnlyForwardRange() = default;
constexpr ForwardIter begin() const { return ForwardIter(const_cast<int*>(buff)); }
constexpr ForwardIter end() const { return ForwardIter(const_cast<int*>(buff) + 8); }
};
struct EmptyIsTrue : std::ranges::view_interface<EmptyIsTrue> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr ForwardIter begin() const { return ForwardIter(const_cast<int*>(buff)); }
constexpr ForwardIter end() const { return ForwardIter(const_cast<int*>(buff) + 8); }
constexpr bool empty() const { return true; }
};
struct SizeIsTen : std::ranges::view_interface<SizeIsTen> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr ForwardIter begin() const { return ForwardIter(const_cast<int*>(buff)); }
constexpr ForwardIter end() const { return ForwardIter(const_cast<int*>(buff) + 8); }
constexpr size_t size() const { return 10; }
};
using RAIter = random_access_iterator<int*>;
struct RARange : std::ranges::view_interface<RARange> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr RAIter begin() const { return RAIter(const_cast<int*>(buff)); }
constexpr RAIter end() const { return RAIter(const_cast<int*>(buff) + 8); }
};
using ContIter = contiguous_iterator<const int*>;
struct ContRange : std::ranges::view_interface<ContRange> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr ContIter begin() const { return ContIter(buff); }
constexpr ContIter end() const { return ContIter(buff + 8); }
};
struct DataIsNull : std::ranges::view_interface<DataIsNull> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr ContIter begin() const { return ContIter(buff); }
constexpr ContIter end() const { return ContIter(buff + 8); }
constexpr const int *data() const { return nullptr; }
};
template<bool IsNoexcept>
struct BoolConvertibleComparison : std::ranges::view_interface<BoolConvertibleComparison<IsNoexcept>> {
struct ResultType {
bool value;
constexpr operator bool() const noexcept(IsNoexcept) { return value; }
};
struct SentinelType {
int *base_;
SentinelType() = default;
explicit constexpr SentinelType(int *base) : base_(base) {}
friend constexpr ResultType operator==(ForwardIter const& iter, SentinelType const& sent) noexcept { return {iter.base() == sent.base_}; }
friend constexpr ResultType operator==(SentinelType const& sent, ForwardIter const& iter) noexcept { return {iter.base() == sent.base_}; }
friend constexpr ResultType operator!=(ForwardIter const& iter, SentinelType const& sent) noexcept { return {iter.base() != sent.base_}; }
friend constexpr ResultType operator!=(SentinelType const& sent, ForwardIter const& iter) noexcept { return {iter.base() != sent.base_}; }
};
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
constexpr ForwardIter begin() const noexcept { return ForwardIter(const_cast<int*>(buff)); }
constexpr SentinelType end() const noexcept { return SentinelType(const_cast<int*>(buff) + 8); }
};
template<class T>
concept EmptyInvocable = requires (T const& obj) { obj.empty(); };
template<class T>
concept BoolOpInvocable = requires (T const& obj) { bool(obj); };
constexpr bool testEmpty() {
static_assert(!EmptyInvocable<InputRange>);
static_assert( EmptyInvocable<ForwardRange>);
static_assert(!BoolOpInvocable<InputRange>);
static_assert( BoolOpInvocable<ForwardRange>);
ForwardRange forwardRange;
assert(!forwardRange.empty());
assert(!static_cast<ForwardRange const&>(forwardRange).empty());
assert(forwardRange);
assert(static_cast<ForwardRange const&>(forwardRange));
assert(!std::ranges::empty(forwardRange));
assert(!std::ranges::empty(static_cast<ForwardRange const&>(forwardRange)));
EmptyIsTrue emptyTrue;
assert(emptyTrue.empty());
assert(static_cast<EmptyIsTrue const&>(emptyTrue).empty());
assert(!emptyTrue.std::ranges::view_interface<EmptyIsTrue>::empty());
assert(!emptyTrue);
assert(!static_cast<EmptyIsTrue const&>(emptyTrue));
assert(!emptyTrue.std::ranges::view_interface<EmptyIsTrue>::operator bool());
assert(std::ranges::empty(emptyTrue));
assert(std::ranges::empty(static_cast<EmptyIsTrue const&>(emptyTrue)));
// Try calling empty on an rvalue.
MoveOnlyForwardRange moveOnly;
assert(!std::move(moveOnly).empty());
BoolConvertibleComparison<true> boolConv;
BoolConvertibleComparison<false> boolConv2;
static_assert(noexcept(boolConv.empty()));
static_assert(!noexcept(boolConv2.empty()));
assert(!boolConv.empty());
assert(!static_cast<BoolConvertibleComparison<true> const&>(boolConv).empty());
assert(boolConv);
assert(static_cast<BoolConvertibleComparison<true> const&>(boolConv));
assert(!std::ranges::empty(boolConv));
assert(!std::ranges::empty(static_cast<BoolConvertibleComparison<true> const&>(boolConv)));
return true;
}
template<class T>
concept DataInvocable = requires (T const& obj) { obj.data(); };
constexpr bool testData() {
static_assert(!DataInvocable<ForwardRange>);
static_assert( DataInvocable<ContRange>);
ContRange contiguous;
assert(contiguous.data() == contiguous.buff);
assert(static_cast<ContRange const&>(contiguous).data() == contiguous.buff);
assert(std::ranges::data(contiguous) == contiguous.buff);
assert(std::ranges::data(static_cast<ContRange const&>(contiguous)) == contiguous.buff);
DataIsNull dataNull;
assert(dataNull.data() == nullptr);
assert(static_cast<DataIsNull const&>(dataNull).data() == nullptr);
assert(dataNull.std::ranges::view_interface<DataIsNull>::data() == dataNull.buff);
assert(std::ranges::data(dataNull) == nullptr);
assert(std::ranges::data(static_cast<DataIsNull const&>(dataNull)) == nullptr);
return true;
}
template<class T>
concept SizeInvocable = requires (T const& obj) { obj.size(); };
constexpr bool testSize() {
static_assert(!SizeInvocable<InputRange>);
static_assert(!SizeInvocable<NotSizedSentinel>);
static_assert( SizeInvocable<ForwardRange>);
ForwardRange forwardRange;
assert(forwardRange.size() == 8);
assert(static_cast<ForwardRange const&>(forwardRange).size() == 8);
assert(std::ranges::size(forwardRange) == 8);
assert(std::ranges::size(static_cast<ForwardRange const&>(forwardRange)) == 8);
SizeIsTen sizeTen;
assert(sizeTen.size() == 10);
assert(static_cast<SizeIsTen const&>(sizeTen).size() == 10);
assert(sizeTen.std::ranges::view_interface<SizeIsTen>::size() == 8);
assert(std::ranges::size(sizeTen) == 10);
assert(std::ranges::size(static_cast<SizeIsTen const&>(sizeTen)) == 10);
return true;
}
template<class T>
concept SubscriptInvocable = requires (T const& obj, size_t n) { obj[n]; };
constexpr bool testSubscript() {
static_assert(!SubscriptInvocable<ForwardRange>);
static_assert( SubscriptInvocable<RARange>);
RARange randomAccess;
assert(randomAccess[2] == 2);
assert(static_cast<RARange const&>(randomAccess)[2] == 2);
randomAccess[2] = 3;
assert(randomAccess[2] == 3);
return true;
}
template<class T>
concept FrontInvocable = requires (T const& obj) { obj.front(); };
template<class T>
concept BackInvocable = requires (T const& obj) { obj.back(); };
constexpr bool testFrontBack() {
static_assert(!FrontInvocable<InputRange>);
static_assert( FrontInvocable<ForwardRange>);
static_assert(!BackInvocable<ForwardRange>);
static_assert( BackInvocable<RARange>);
ForwardRange forwardRange;
assert(forwardRange.front() == 0);
assert(static_cast<ForwardRange const&>(forwardRange).front() == 0);
forwardRange.front() = 2;
assert(forwardRange.front() == 2);
RARange randomAccess;
assert(randomAccess.front() == 0);
assert(static_cast<RARange const&>(randomAccess).front() == 0);
randomAccess.front() = 2;
assert(randomAccess.front() == 2);
assert(randomAccess.back() == 7);
assert(static_cast<RARange const&>(randomAccess).back() == 7);
randomAccess.back() = 2;
assert(randomAccess.back() == 2);
return true;
}
int main(int, char**) {
testEmpty();
static_assert(testEmpty());
testData();
static_assert(testData());
testSize();
static_assert(testSize());
testSubscript();
static_assert(testSubscript());
testFrontBack();
static_assert(testFrontBack());
return 0;
}
|
