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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#pragma once
#ifndef GSL_BYTE_H
#define GSL_BYTE_H
#ifdef _MSC_VER
#pragma warning(push)
// don't warn about function style casts in byte related operators
#pragma warning(disable : 26493)
// MSVC 2013 workarounds
#if _MSC_VER <= 1800
// constexpr is not understood
#pragma push_macro("constexpr")
#define constexpr /*constexpr*/
// noexcept is not understood
#pragma push_macro("noexcept")
#define noexcept /*noexcept*/
#endif // _MSC_VER <= 1800
#endif // _MSC_VER
namespace gsl
{
// This is a simple definition for now that allows
// use of byte within span<> to be standards-compliant
enum class byte : unsigned char
{
};
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
inline constexpr byte& operator<<=(byte& b, IntegerType shift) noexcept
{
return b = byte(static_cast<unsigned char>(b) << shift);
}
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
inline constexpr byte operator<<(byte b, IntegerType shift) noexcept
{
return byte(static_cast<unsigned char>(b) << shift);
}
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
inline constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept
{
return b = byte(static_cast<unsigned char>(b) >> shift);
}
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
inline constexpr byte operator>>(byte b, IntegerType shift) noexcept
{
return byte(static_cast<unsigned char>(b) >> shift);
}
inline constexpr byte& operator|=(byte& l, byte r) noexcept
{
return l = byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
}
inline constexpr byte operator|(byte l, byte r) noexcept
{
return byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
}
inline constexpr byte& operator&=(byte& l, byte r) noexcept
{
return l = byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
}
inline constexpr byte operator&(byte l, byte r) noexcept
{
return byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
}
inline constexpr byte& operator^=(byte& l, byte r) noexcept
{
return l = byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
}
inline constexpr byte operator^(byte l, byte r) noexcept
{
return byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
}
inline constexpr byte operator~(byte b) noexcept { return byte(~static_cast<unsigned char>(b)); }
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
inline constexpr IntegerType to_integer(byte b) noexcept
{
return static_cast<IntegerType>(b);
}
template<bool E, typename T>
inline constexpr byte to_byte_impl(T t) noexcept
{
static_assert(
E,
"gsl::to_byte(t) must be provided an unsigned char, otherwise data loss may occur. "
"If you are calling to_byte with an integer contant use: gsl::to_byte<t>() version."
);
return static_cast<byte>(t);
}
template<>
inline constexpr byte to_byte_impl<true, unsigned char>(unsigned char t) noexcept
{
return byte(t);
}
template<typename T>
inline constexpr byte to_byte(T t) noexcept
{
return to_byte_impl<std::is_same<T, unsigned char>::value, T>(t);
}
template <int I>
inline constexpr byte to_byte() noexcept
{
static_assert(I >= 0 && I <= 255, "gsl::byte only has 8 bits of storage, values must be in range 0-255");
return static_cast<byte>(I);
}
} // namespace gsl
#ifdef _MSC_VER
#if _MSC_VER <= 1800
#undef constexpr
#pragma pop_macro("constexpr")
#undef noexcept
#pragma pop_macro("noexcept")
#endif // _MSC_VER <= 1800
#pragma warning(pop)
#endif // _MSC_VER
#endif // GSL_BYTE_H
|
