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
|
//===----------------------------------------------------------------------===//
//
// 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, c++20
// std::views::as_rvalue
#include <cassert>
#include <functional>
#include <ranges>
#include <vector>
#include "test_iterators.h"
struct DefaultConstructibleView : std::ranges::view_base {
int i_;
int* begin();
int* end();
};
struct RValueView : std::ranges::view_base {};
template <class View, class T>
concept HasPipe = requires(View&& view, T&& t) {
{ std::forward<View>(view) | std::forward<T>(t) };
};
struct NoView {};
static_assert(std::is_invocable_v<decltype(std::views::as_rvalue), DefaultConstructibleView>);
static_assert(!std::is_invocable_v<decltype(std::views::as_rvalue)>);
static_assert(!std::is_invocable_v<decltype(std::views::as_rvalue), NoView>);
static_assert(HasPipe<DefaultConstructibleView&, decltype(std::views::as_rvalue)>);
static_assert(HasPipe<int (&)[10], decltype(std::views::as_rvalue)>);
static_assert(!HasPipe<int (&&)[10], decltype(std::views::as_rvalue)>);
static_assert(!HasPipe<NoView, decltype(std::views::as_rvalue)>);
static_assert(std::is_same_v<decltype(std::views::as_rvalue), decltype(std::ranges::views::as_rvalue)>);
struct move_iterator_range {
constexpr std::move_iterator<int*> begin() const { return {}; }
constexpr std::move_iterator<int*> end() const { return {}; }
};
static_assert(!std::ranges::view<move_iterator_range>);
static_assert(std::ranges::range<move_iterator_range>);
constexpr bool test() {
{ // view | views::as_rvalue
DefaultConstructibleView v{{}, 3};
std::same_as<std::ranges::as_rvalue_view<DefaultConstructibleView>> decltype(auto) view = v | std::views::as_rvalue;
assert(view.base().i_ == 3);
}
{ // adaptor | views::as_rvalue
DefaultConstructibleView v{{}, 3};
const auto partial = std::views::transform(std::identity{}) | std::views::as_rvalue;
std::same_as<std::ranges::as_rvalue_view<
std::ranges::transform_view<DefaultConstructibleView, std::identity>>> decltype(auto) view = partial(v);
assert(view.base().base().i_ == 3);
}
{ // views::as_rvalue | adaptor
DefaultConstructibleView v{{}, 3};
const auto partial = std::views::as_rvalue | std::views::transform(std::identity{});
std::same_as<std::ranges::transform_view<std::ranges::as_rvalue_view<DefaultConstructibleView>,
std::identity>> decltype(auto) view = partial(v);
assert(view.base().base().i_ == 3);
}
{ // rvalue-view | views::as_rvalue
int a[4] = {1, 2, 3, 4};
std::ranges::subrange range(rvalue_iterator{a}, rvalue_iterator{a + 4});
[[maybe_unused]] std::same_as<std::ranges::subrange<rvalue_iterator<int>>> decltype(auto) rval_range =
range | std::views::as_rvalue;
}
{ // range | views::as_rvalue
[[maybe_unused]] std::same_as<std::ranges::as_rvalue_view<std::views::all_t<std::vector<int>>>> decltype(auto)
view = std::vector<int>{} | std::views::as_rvalue;
}
{ // rvalue-range | views::as_rvalue
[[maybe_unused]] std::same_as<std::views::all_t<move_iterator_range>> decltype(auto) view =
move_iterator_range{} | std::views::as_rvalue;
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
