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
|
//===----------------------------------------------------------------------===//
//
// 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: libcpp-has-no-incomplete-ranges
// <ranges>
// template<class T>
// concept view = ...;
#include <ranges>
#include "test_macros.h"
// The type would be a view, but it's not moveable.
struct NotMoveable : std::ranges::view_base {
NotMoveable() = default;
NotMoveable(NotMoveable&&) = delete;
NotMoveable& operator=(NotMoveable&&) = delete;
friend int* begin(NotMoveable&);
friend int* begin(NotMoveable const&);
friend int* end(NotMoveable&);
friend int* end(NotMoveable const&);
};
static_assert(std::ranges::range<NotMoveable>);
static_assert(!std::movable<NotMoveable>);
static_assert(std::default_initializable<NotMoveable>);
static_assert(std::ranges::enable_view<NotMoveable>);
static_assert(!std::ranges::view<NotMoveable>);
// The type would be a view, but it's not default initializable
struct NotDefaultInit : std::ranges::view_base {
NotDefaultInit() = delete;
friend int* begin(NotDefaultInit&);
friend int* begin(NotDefaultInit const&);
friend int* end(NotDefaultInit&);
friend int* end(NotDefaultInit const&);
};
static_assert(std::ranges::range<NotDefaultInit>);
static_assert(std::movable<NotDefaultInit>);
static_assert(!std::default_initializable<NotDefaultInit>);
static_assert(std::ranges::enable_view<NotDefaultInit>);
static_assert(std::ranges::view<NotDefaultInit>);
// The type would be a view, but it doesn't enable it with enable_view
struct NotExplicitlyEnabled {
NotExplicitlyEnabled() = default;
NotExplicitlyEnabled(NotExplicitlyEnabled&&) = default;
NotExplicitlyEnabled& operator=(NotExplicitlyEnabled&&) = default;
friend int* begin(NotExplicitlyEnabled&);
friend int* begin(NotExplicitlyEnabled const&);
friend int* end(NotExplicitlyEnabled&);
friend int* end(NotExplicitlyEnabled const&);
};
static_assert(std::ranges::range<NotExplicitlyEnabled>);
static_assert(std::movable<NotExplicitlyEnabled>);
static_assert(std::default_initializable<NotExplicitlyEnabled>);
static_assert(!std::ranges::enable_view<NotExplicitlyEnabled>);
static_assert(!std::ranges::view<NotExplicitlyEnabled>);
// The type has everything else, but it's not a range
struct NotARange : std::ranges::view_base {
NotARange() = default;
NotARange(NotARange&&) = default;
NotARange& operator=(NotARange&&) = default;
};
static_assert(!std::ranges::range<NotARange>);
static_assert(std::movable<NotARange>);
static_assert(std::default_initializable<NotARange>);
static_assert(std::ranges::enable_view<NotARange>);
static_assert(!std::ranges::view<NotARange>);
// The type satisfies all requirements
struct View : std::ranges::view_base {
View() = default;
View(View&&) = default;
View& operator=(View&&) = default;
friend int* begin(View&);
friend int* begin(View const&);
friend int* end(View&);
friend int* end(View const&);
};
static_assert(std::ranges::range<View>);
static_assert(std::movable<View>);
static_assert(std::default_initializable<View>);
static_assert(std::ranges::enable_view<View>);
static_assert(std::ranges::view<View>);
|
