/
all.pass.cpp
209 lines (175 loc) · 7.16 KB
/
all.pass.cpp
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
//===----------------------------------------------------------------------===//
//
// 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
// std::views::all;
#include <ranges>
#include <cassert>
#include <concepts>
#include <type_traits>
#include <utility>
#include "test_macros.h"
#include "test_iterators.h"
int globalBuff[8];
template<bool IsNoexcept>
struct View : std::ranges::view_base {
int start_ = 0;
explicit View() noexcept(IsNoexcept) = default;
constexpr explicit View(int start) : start_(start) {}
View(View&&) noexcept(IsNoexcept) = default;
View& operator=(View&&) noexcept(IsNoexcept) = default;
constexpr int* begin() const { return globalBuff + start_; }
constexpr int* end() const { return globalBuff + 8; }
};
static_assert(std::ranges::view<View<true>>);
static_assert(std::ranges::view<View<false>>);
template<bool IsNoexcept>
struct CopyableView : std::ranges::view_base {
int start_ = 0;
explicit CopyableView() noexcept(IsNoexcept) = default;
CopyableView(CopyableView const&) noexcept(IsNoexcept) = default;
CopyableView& operator=(CopyableView const&) noexcept(IsNoexcept) = default;
constexpr explicit CopyableView(int start) noexcept : start_(start) {}
constexpr int* begin() const { return globalBuff + start_; }
constexpr int* end() const { return globalBuff + 8; }
};
static_assert(std::ranges::view<CopyableView<true>>);
static_assert(std::ranges::view<CopyableView<false>>);
struct MoveOnlyView : std::ranges::view_base{
MoveOnlyView() = default;
MoveOnlyView(const MoveOnlyView&) = delete;
MoveOnlyView& operator=(const MoveOnlyView&) = delete;
MoveOnlyView(MoveOnlyView&&) = default;
MoveOnlyView& operator=(MoveOnlyView&&) = default;
int* begin() const;
int* end() const;
};
struct Range {
int start_;
constexpr explicit Range(int start) noexcept : start_(start) {}
constexpr int* begin() const { return globalBuff + start_; }
constexpr int* end() const { return globalBuff + 8; }
};
struct BorrowableRange {
int start_;
constexpr explicit BorrowableRange(int start) noexcept : start_(start) {}
constexpr int* begin() const { return globalBuff + start_; }
constexpr int* end() const { return globalBuff + 8; }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
struct RandomAccessRange {
constexpr auto begin() { return random_access_iterator<int*>(globalBuff); }
constexpr auto end() { return sized_sentinel(random_access_iterator<int*>(globalBuff + 8)); }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<RandomAccessRange> = true;
template <class View, class T>
concept CanBePiped = requires (View&& view, T&& t) {
{ std::forward<View>(view) | std::forward<T>(t) };
};
constexpr bool test() {
{
ASSERT_SAME_TYPE(decltype(std::views::all(View<true>())), View<true>);
static_assert(noexcept(std::views::all(View<true>())));
static_assert(!noexcept(std::views::all(View<false>())));
auto viewCopy = std::views::all(View<true>(2));
ASSERT_SAME_TYPE(decltype(viewCopy), View<true>);
assert(std::ranges::begin(viewCopy) == globalBuff + 2);
assert(std::ranges::end(viewCopy) == globalBuff + 8);
}
{
ASSERT_SAME_TYPE(decltype(std::views::all(std::declval<const CopyableView<true>&>())), CopyableView<true>);
static_assert(noexcept(std::views::all(CopyableView<true>())));
static_assert(!noexcept(std::views::all(CopyableView<false>())));
CopyableView<true> view(2);
auto viewCopy = std::views::all(view);
ASSERT_SAME_TYPE(decltype(viewCopy), CopyableView<true>);
assert(std::ranges::begin(viewCopy) == globalBuff + 2);
assert(std::ranges::end(viewCopy) == globalBuff + 8);
}
{
Range range(2);
auto ref = std::views::all(range);
ASSERT_SAME_TYPE(decltype(ref), std::ranges::ref_view<Range>);
assert(std::ranges::begin(ref) == globalBuff + 2);
assert(std::ranges::end(ref) == globalBuff + 8);
auto own = std::views::all(std::move(range));
ASSERT_SAME_TYPE(decltype(own), std::ranges::owning_view<Range>);
assert(std::ranges::begin(own) == globalBuff + 2);
assert(std::ranges::end(own) == globalBuff + 8);
auto cref = std::views::all(std::as_const(range));
ASSERT_SAME_TYPE(decltype(cref), std::ranges::ref_view<const Range>);
assert(std::ranges::begin(cref) == globalBuff + 2);
assert(std::ranges::end(cref) == globalBuff + 8);
static_assert(!std::is_invocable_v<decltype(std::views::all), const Range&&>);
}
{
auto own = std::views::all(BorrowableRange(2));
ASSERT_SAME_TYPE(decltype(own), std::ranges::owning_view<BorrowableRange>);
assert(std::ranges::begin(own) == globalBuff + 2);
assert(std::ranges::end(own) == globalBuff + 8);
}
{
auto own = std::views::all(RandomAccessRange());
ASSERT_SAME_TYPE(decltype(own), std::ranges::owning_view<RandomAccessRange>);
assert(base(std::ranges::begin(own)) == globalBuff);
assert(base(base(std::ranges::end(own))) == globalBuff + 8);
}
// Check SFINAE friendliness of the call operator
{
static_assert(!std::is_invocable_v<decltype(std::views::all)>);
static_assert(!std::is_invocable_v<decltype(std::views::all), RandomAccessRange, RandomAccessRange>);
// `views::all(v)` is expression equivalent to `decay-copy(v)` if the decayed type
// of `v` models `view`. If `v` is an lvalue-reference to a move-only view, the
// expression should be ill-formed because `v` is not copyable
static_assert(!std::is_invocable_v<decltype(std::views::all), MoveOnlyView&>);
}
// Test that std::views::all is a range adaptor
{
// Test `v | views::all`
{
Range range(0);
auto result = range | std::views::all;
ASSERT_SAME_TYPE(decltype(result), std::ranges::ref_view<Range>);
assert(&result.base() == &range);
}
// Test `adaptor | views::all`
{
Range range(0);
auto f = [](int i) { return i; };
auto const partial = std::views::transform(f) | std::views::all;
using Result = std::ranges::transform_view<std::ranges::ref_view<Range>, decltype(f)>;
std::same_as<Result> auto result = partial(range);
assert(&result.base().base() == &range);
}
// Test `views::all | adaptor`
{
Range range(0);
auto f = [](int i) { return i; };
auto const partial = std::views::all | std::views::transform(f);
using Result = std::ranges::transform_view<std::ranges::ref_view<Range>, decltype(f)>;
std::same_as<Result> auto result = partial(range);
assert(&result.base().base() == &range);
}
{
struct NotAView { };
static_assert( CanBePiped<Range&, decltype(std::views::all)>);
static_assert(!CanBePiped<NotAView, decltype(std::views::all)>);
}
}
{
static_assert(std::same_as<decltype(std::views::all), decltype(std::ranges::views::all)>);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}