blob: 5347b78da9106b838186a22e09eb679b64f4db00 (
plain) (
blame)
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
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___RANGES_SINGLE_VIEW_H
#define _LIBCPP___RANGES_SINGLE_VIEW_H
#include <__config>
#include <__ranges/copyable_box.h>
#include <__ranges/view_interface.h>
#include <__utility/forward.h>
#include <__utility/in_place.h>
#include <__utility/move.h>
#include <concepts>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
namespace ranges {
template<copy_constructible _Tp>
requires is_object_v<_Tp>
class single_view : public view_interface<single_view<_Tp>> {
__copyable_box<_Tp> __value_;
public:
_LIBCPP_HIDE_FROM_ABI
single_view() requires default_initializable<_Tp> = default;
_LIBCPP_HIDE_FROM_ABI
constexpr explicit single_view(const _Tp& __t) : __value_(in_place, __t) {}
_LIBCPP_HIDE_FROM_ABI
constexpr explicit single_view(_Tp&& __t) : __value_(in_place, std::move(__t)) {}
template<class... _Args>
requires constructible_from<_Tp, _Args...>
_LIBCPP_HIDE_FROM_ABI
constexpr explicit single_view(in_place_t, _Args&&... __args)
: __value_{in_place, std::forward<_Args>(__args)...} {}
_LIBCPP_HIDE_FROM_ABI
constexpr _Tp* begin() noexcept { return data(); }
_LIBCPP_HIDE_FROM_ABI
constexpr const _Tp* begin() const noexcept { return data(); }
_LIBCPP_HIDE_FROM_ABI
constexpr _Tp* end() noexcept { return data() + 1; }
_LIBCPP_HIDE_FROM_ABI
constexpr const _Tp* end() const noexcept { return data() + 1; }
_LIBCPP_HIDE_FROM_ABI
static constexpr size_t size() noexcept { return 1; }
_LIBCPP_HIDE_FROM_ABI
constexpr _Tp* data() noexcept { return __value_.operator->(); }
_LIBCPP_HIDE_FROM_ABI
constexpr const _Tp* data() const noexcept { return __value_.operator->(); }
};
template<class _Tp>
single_view(_Tp) -> single_view<_Tp>;
} // namespace ranges
#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_SINGLE_VIEW_H
|
