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Side by Side Diff: sky/engine/wtf/EnumClass.h

Issue 714393002: Remove support for MSVC (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 6 years, 1 month ago
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1 /* 1 /*
2 * Copyright (C) 2013 Apple Inc. All rights reserved. 2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions 5 * modification, are permitted provided that the following conditions
6 * are met: 6 * are met:
7 * 1. Redistributions of source code must retain the above copyright 7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer. 8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright 9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the 10 * notice, this list of conditions and the following disclaimer in the
(...skipping 35 matching lines...) Expand 10 before | Expand all | Expand 10 after
46 // ENUM_CLASS(MyEnums) { 46 // ENUM_CLASS(MyEnums) {
47 // Value1, 47 // Value1,
48 // Value2, 48 // Value2,
49 // ... 49 // ...
50 // ValueN 50 // ValueN
51 // } ENUM_CLASS_END(MyEnums); 51 // } ENUM_CLASS_END(MyEnums);
52 // 52 //
53 // The ENUM_CLASS macros will use C++11's enum class if the compiler supports it . 53 // The ENUM_CLASS macros will use C++11's enum class if the compiler supports it .
54 // Otherwise, it will use the EnumClass template below. 54 // Otherwise, it will use the EnumClass template below.
55 55
56 #if COMPILER_SUPPORTS(CXX_STRONG_ENUMS)
57 56
58 #define ENUM_CLASS(__enumName) \ 57 #define ENUM_CLASS(__enumName) \
59 enum class __enumName 58 enum class __enumName
60 59
61 #define ENUM_CLASS_END(__enumName) 60 #define ENUM_CLASS_END(__enumName)
62 61
63 #else // !COMPILER_SUPPORTS(CXX_STRONG_ENUMS)
64
65 // How to define a type safe enum list using the EnumClass template?
66 // ================================================================
67 // Definition should be a struct that encapsulates an enum list.
68 // The enum list should be names Enums.
69 //
70 // Here's an example of how to define a type safe enum named MyEnum using
71 // the EnumClass template:
72 //
73 // struct MyEnumDefinition {
74 // enum Enums {
75 // ValueDefault,
76 // Value1,
77 // ...
78 // ValueN
79 // };
80 // };
81 // typedef EnumClass<MyEnumDefinition, MyEnumDefinition::ValueDefault> MyEnu m;
82 //
83 // With that, you can now use MyEnum enum values as follow:
84 //
85 // MyEnum value1; // value1 is assigned MyEnum::ValueDefault by default.
86 // MyEnum value2 = MyEnum::Value1; // value2 is assigned MyEnum::Value1;
87
88 template <typename Definition>
89 class EnumClass : public Definition {
90 typedef enum Definition::Enums Value;
91 public:
92 ALWAYS_INLINE EnumClass() { }
93 ALWAYS_INLINE EnumClass(Value value) : m_value(value) { }
94
95 ALWAYS_INLINE Value value() const { return m_value; }
96
97 ALWAYS_INLINE bool operator==(const EnumClass other) { return m_value == oth er.m_value; }
98 ALWAYS_INLINE bool operator!=(const EnumClass other) { return m_value != oth er.m_value; }
99 ALWAYS_INLINE bool operator<(const EnumClass other) { return m_value < other .m_value; }
100 ALWAYS_INLINE bool operator<=(const EnumClass other) { return m_value <= oth er.m_value; }
101 ALWAYS_INLINE bool operator>(const EnumClass other) { return m_value > other .m_value; }
102 ALWAYS_INLINE bool operator>=(const EnumClass other) { return m_value >= oth er.m_value; }
103
104 ALWAYS_INLINE bool operator==(const Value value) { return m_value == value; }
105 ALWAYS_INLINE bool operator!=(const Value value) { return m_value != value; }
106 ALWAYS_INLINE bool operator<(const Value value) { return m_value < value; }
107 ALWAYS_INLINE bool operator<=(const Value value) { return m_value <= value; }
108 ALWAYS_INLINE bool operator>(const Value value) { return m_value > value; }
109 ALWAYS_INLINE bool operator>=(const Value value) { return m_value >= value; }
110
111 ALWAYS_INLINE operator Value() { return m_value; }
112
113 private:
114 Value m_value;
115 };
116
117 #define ENUM_CLASS(__enumName) \
118 struct __enumName ## Definition { \
119 enum Enums
120
121 #define ENUM_CLASS_END(__enumName) \
122 ; \
123 }; \
124 typedef EnumClass< __enumName ## Definition > __enumName
125
126 #endif // !COMPILER_SUPPORTS(CXX_STRONG_ENUMS)
127
128 } // namespace WTF 62 } // namespace WTF
129 63
130 #if !COMPILER_SUPPORTS(CXX_STRONG_ENUMS)
131 using WTF::EnumClass;
132 #endif
133
134 #endif // WTF_EnumClass_h 64 #endif // WTF_EnumClass_h
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