1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11// template <input_range Range>
12// requires constructible_from<View, views::all_t<Range>> &&
13// constructible_from<Pattern, single_view<range_value_t<Range>>>
14// constexpr split_view(Range&& r, range_value_t<Range> e); // explicit since C++23
15
16#include <algorithm>
17#include <cassert>
18#include <ranges>
19#include <string>
20#include <string_view>
21#include <type_traits>
22#include <utility>
23
24#include "test_convertible.h"
25#include "test_macros.h"
26
27struct Counting {
28 int* times_copied = nullptr;
29 int* times_moved = nullptr;
30
31 constexpr Counting(int& copies_ctr, int& moves_ctr) : times_copied(&copies_ctr), times_moved(&moves_ctr) {}
32
33 constexpr Counting(const Counting& rhs) : times_copied(rhs.times_copied), times_moved(rhs.times_moved) {
34 ++(*times_copied);
35 }
36 constexpr Counting(Counting&& rhs) : times_copied(rhs.times_copied), times_moved(rhs.times_moved) {
37 ++(*times_moved);
38 }
39
40 constexpr Counting& operator=(const Counting&) = default;
41 constexpr Counting& operator=(Counting&&) = default;
42};
43
44struct ElementWithCounting : Counting {
45 using Counting::Counting;
46
47 constexpr bool operator==(const ElementWithCounting&) const { return true; }
48};
49
50struct RangeWithCounting : Counting {
51 using Counting::Counting;
52
53 constexpr const ElementWithCounting* begin() const { return nullptr; }
54 constexpr const ElementWithCounting* end() const { return nullptr; }
55
56 constexpr bool operator==(const RangeWithCounting&) const { return true; }
57};
58static_assert(std::ranges::forward_range<RangeWithCounting>);
59static_assert(!std::ranges::view<RangeWithCounting>);
60
61struct StrView : std::ranges::view_base {
62 std::string buffer_;
63
64 template <std::ranges::range R>
65 constexpr StrView(R&& r) : buffer_(std::ranges::begin(r), std::ranges::end(r)) {}
66 constexpr const char* begin() const { return buffer_.data(); }
67 constexpr const char* end() const { return buffer_.data() + buffer_.size(); }
68 constexpr bool operator==(const StrView& rhs) const { return buffer_ == rhs.buffer_; }
69};
70static_assert(std::ranges::random_access_range<StrView>);
71static_assert(std::ranges::view<StrView>);
72static_assert(std::is_copy_constructible_v<StrView>);
73
74// SFINAE tests.
75
76#if TEST_STD_VER >= 23
77
78static_assert(
79 !test_convertible<std::ranges::split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
80 "This constructor must be explicit");
81
82# else
83
84static_assert(
85 test_convertible<std::ranges::split_view<StrView, StrView>, StrView, std::ranges::range_value_t<StrView>>(),
86 "This constructor must not be explicit");
87
88#endif // TEST_STD_VER >= 23
89
90constexpr bool test() {
91 {
92 using V = std::ranges::split_view<StrView, StrView>;
93
94 // Calling the constructor with `(std::string, range_value_t)`.
95 {
96 std::string input("abc def");
97 V v(input, ' ');
98 assert(v.base() == input);
99 assert(std::ranges::equal(*v.begin(), std::string_view("abc")));
100 }
101
102 // Calling the constructor with `(StrView, range_value_t)`.
103 {
104 StrView input("abc def");
105 V v(input, ' ');
106 assert(v.base() == input);
107 assert(std::ranges::equal(*v.begin(), std::string_view("abc")));
108 }
109
110 struct Empty {};
111 static_assert(!std::is_constructible_v<V, Empty, std::string_view>);
112 static_assert(!std::is_constructible_v<V, std::string_view, Empty>);
113 }
114
115 // Make sure the arguments are moved, not copied.
116 {
117 using Range = RangeWithCounting;
118 using Element = ElementWithCounting;
119 using Pattern = std::ranges::single_view<Element>;
120
121 // Arguments are lvalues.
122 {
123 using View = std::ranges::ref_view<Range>;
124
125 int range_copied = 0, range_moved = 0, element_copied = 0, element_moved = 0;
126 Range range(range_copied, range_moved);
127 Element element(element_copied, element_moved);
128
129 std::ranges::split_view<View, Pattern> v(range, element);
130 assert(range_copied == 0); // `ref_view` does neither copy...
131 assert(range_moved == 0); // ...nor move the element.
132 assert(element_copied == 1); // The element is copied into the argument...
133 assert(element_moved == 1); // ...and moved into the member variable.
134 }
135
136 // Arguments are rvalues.
137 {
138 using View = std::ranges::owning_view<Range>;
139
140 int range_copied = 0, range_moved = 0, element_copied = 0, element_moved = 0;
141 std::ranges::split_view<View, Pattern> v(
142 Range(range_copied, range_moved), Element(element_copied, element_moved));
143 assert(range_copied == 0);
144 assert(range_moved == 1); // `owning_view` moves the given argument.
145 assert(element_copied == 0);
146 assert(element_moved == 1);
147 }
148 }
149
150 return true;
151}
152
153int main(int, char**) {
154 test();
155 static_assert(test());
156
157 return 0;
158}
159

source code of libcxx/test/std/ranges/range.adaptors/range.split/ctor.range.pass.cpp