1 // Copyright 2020 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #pragma once
15
16 #include <stddef.h>
17
18 #include "pw_polyfill/standard_library/namespace.h"
19
20 _PW_POLYFILL_BEGIN_NAMESPACE_STD
21
22 using ::ptrdiff_t;
23 using ::size_t;
24 using nullptr_t = decltype(nullptr);
25 using ::max_align_t;
26
27 #define __cpp_lib_byte 201603L
28
29 enum class byte : unsigned char {};
30
31 template <typename I>
to_integer(byte b)32 constexpr I to_integer(byte b) noexcept {
33 return I(b);
34 }
35
36 constexpr byte operator|(byte l, byte r) noexcept {
37 return byte(static_cast<unsigned int>(l) | static_cast<unsigned int>(r));
38 }
39
40 constexpr byte operator&(byte l, byte r) noexcept {
41 return byte(static_cast<unsigned int>(l) & static_cast<unsigned int>(r));
42 }
43
44 constexpr byte operator^(byte l, byte r) noexcept {
45 return byte(static_cast<unsigned int>(l) ^ static_cast<unsigned int>(r));
46 }
47
48 constexpr byte operator~(byte b) noexcept {
49 return byte(~static_cast<unsigned int>(b));
50 }
51
52 template <typename I>
53 constexpr byte operator<<(byte b, I shift) noexcept {
54 return byte(static_cast<unsigned int>(b) << shift);
55 }
56
57 template <typename I>
58 constexpr byte operator>>(byte b, I shift) noexcept {
59 return byte(static_cast<unsigned int>(b) >> shift);
60 }
61
62 constexpr byte& operator|=(byte& l, byte r) noexcept { return l = l | r; }
63 constexpr byte& operator&=(byte& l, byte r) noexcept { return l = l & r; }
64 constexpr byte& operator^=(byte& l, byte r) noexcept { return l = l ^ r; }
65
66 template <typename I>
67 inline byte& operator<<=(byte& b, I shift) noexcept {
68 return b = b << shift;
69 }
70
71 template <typename I>
72 inline byte& operator>>=(byte& b, I shift) noexcept {
73 return b = b >> shift;
74 }
75
76 _PW_POLYFILL_END_NAMESPACE_STD
77