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
|
//===----------------------------------------------------------------------===//
//
// 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
// template <input_range Range>
// requires constructible_from<View, views::all_t<Range>> &&
// constructible_from<Pattern, single_view<range_value_t<Range>>>
// constexpr lazy_split_view(Range&& r, range_value_t<Range> e); // explicit since C++23
#include <ranges>
#include <cassert>
#include <string>
#include <string_view>
#include <type_traits>
#include <utility>
#include "test_convertible.h"
#include "test_macros.h"
#include "types.h"
struct ElementWithCounting {
int* times_copied = nullptr;
int* times_moved = nullptr;
constexpr ElementWithCounting(int& copies_ctr, int& moves_ctr) : times_copied(&copies_ctr), times_moved(&moves_ctr) {}
constexpr ElementWithCounting(const ElementWithCounting& rhs)
: times_copied(rhs.times_copied), times_moved(rhs.times_moved) {
++(*times_copied);
}
constexpr ElementWithCounting(ElementWithCounting&& rhs)
: times_copied(rhs.times_copied), times_moved(rhs.times_moved) {
++(*times_moved);
}
constexpr bool operator==(const ElementWithCounting&) const { return true; }
};
struct RangeWithCounting {
using value_type = ElementWithCounting;
int* times_copied = nullptr;
int* times_moved = nullptr;
constexpr RangeWithCounting(int& copies_ctr, int& moves_ctr) : times_copied(&copies_ctr), times_moved(&moves_ctr) {}
constexpr RangeWithCounting(const RangeWithCounting& rhs)
: times_copied(rhs.times_copied), times_moved(rhs.times_moved) {
++(*times_copied);
}
constexpr RangeWithCounting(RangeWithCounting&& rhs) : times_copied(rhs.times_copied), times_moved(rhs.times_moved) {
++(*times_moved);
}
constexpr const ElementWithCounting* begin() const { return nullptr; }
constexpr const ElementWithCounting* end() const { return nullptr; }
constexpr RangeWithCounting& operator=(const RangeWithCounting&) = default;
constexpr RangeWithCounting& operator=(RangeWithCounting&&) = default;
constexpr bool operator==(const RangeWithCounting&) const { return true; }
};
static_assert(std::ranges::forward_range<RangeWithCounting>);
static_assert(!std::ranges::view<RangeWithCounting>);
struct StrView : std::ranges::view_base {
std::string_view buffer_;
constexpr explicit StrView() = default;
constexpr StrView(const char* ptr) : buffer_(ptr) {}
// Intentionally don't forward to range constructor for std::string_view since
// this test needs to work on C++20 as well and the range constructor is only for
// C++23 and later.
template <std::ranges::range R>
constexpr StrView(R&& r) : buffer_(r.begin(), r.end()) {}
constexpr std::string_view::const_iterator begin() const { return buffer_.begin(); }
constexpr std::string_view::const_iterator end() const { return buffer_.end(); }
constexpr bool operator==(const StrView& rhs) const { return buffer_ == rhs.buffer_; }
};
static_assert(std::ranges::random_access_range<StrView>);
static_assert(std::ranges::view<StrView>);
static_assert(std::is_copy_constructible_v<StrView>);
// SFINAE tests.
#if TEST_STD_VER >= 23
static_assert(
!test_convertible<std::ranges::lazy_split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
"This constructor must be explicit");
#else
static_assert(
test_convertible<std::ranges::lazy_split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
"This constructor must not be explicit");
#endif // TEST_STD_VER >= 23
constexpr bool test() {
{
using V = std::ranges::lazy_split_view<StrView, StrView>;
// Calling the constructor with `(std::string, range_value_t)`.
{
std::string input;
V v(input, ' ');
assert(v.base() == input);
}
// Calling the constructor with `(StrView, range_value_t)`.
{
StrView input("abc def");
V v(input, ' ');
assert(v.base() == input);
}
struct Empty {};
static_assert(!std::is_constructible_v<V, Empty, std::string_view>);
static_assert(!std::is_constructible_v<V, std::string_view, Empty>);
}
// Make sure the arguments are moved, not copied.
{
using Range = RangeWithCounting;
using Element = ElementWithCounting;
using Pattern = std::ranges::single_view<Element>;
// Arguments are lvalues.
{
using View = std::ranges::ref_view<Range>;
int range_copied = 0, range_moved = 0, element_copied = 0, element_moved = 0;
Range range(range_copied, range_moved);
Element element(element_copied, element_moved);
std::ranges::lazy_split_view<View, Pattern> v(range, element);
assert(range_copied == 0); // `ref_view` does neither copy...
assert(range_moved == 0); // ...nor move the element.
assert(element_copied == 1); // The element is copied into the argument...
#ifndef TEST_COMPILER_GCC
//https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98995
assert(element_moved == 1); // ...and moved into the member variable.
#endif
}
// Arguments are rvalues.
{
using View = std::ranges::owning_view<Range>;
int range_copied = 0, range_moved = 0, element_copied = 0, element_moved = 0;
std::ranges::lazy_split_view<View, Pattern> v(
Range(range_copied, range_moved), Element(element_copied, element_moved));
assert(range_copied == 0);
assert(range_moved == 1); // `owning_view` moves the given argument.
assert(element_copied == 0);
#ifndef TEST_COMPILER_GCC
//https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98995
assert(element_moved == 1);
#endif
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
