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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_BASE_FLAGS_H_ | 5 #ifndef V8_BASE_FLAGS_H_ |
6 #define V8_BASE_FLAGS_H_ | 6 #define V8_BASE_FLAGS_H_ |
7 | 7 |
8 #include "include/v8config.h" | 8 #include "src/base/compiler-specific.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
11 namespace base { | 11 namespace base { |
12 | 12 |
13 // The Flags class provides a type-safe way of storing OR-combinations of enum | 13 // The Flags class provides a type-safe way of storing OR-combinations of enum |
14 // values. The Flags<T, S> class is a template class, where T is an enum type, | 14 // values. The Flags<T, S> class is a template class, where T is an enum type, |
15 // and S is the underlying storage type (usually int). | 15 // and S is the underlying storage type (usually int). |
16 // | 16 // |
17 // The traditional C++ approach for storing OR-combinations of enum values is to | 17 // The traditional C++ approach for storing OR-combinations of enum values is to |
18 // use an int or unsigned int variable. The inconvenience with this approach is | 18 // use an int or unsigned int variable. The inconvenience with this approach is |
19 // that there's no type checking at all; any enum value can be OR'd with any | 19 // that there's no type checking at all; any enum value can be OR'd with any |
20 // other enum value and passed on to a function that takes an int or unsigned | 20 // other enum value and passed on to a function that takes an int or unsigned |
21 // int. | 21 // int. |
22 template <typename T, typename S = int> | 22 template <typename T, typename S = int> |
23 class Flags V8_FINAL { | 23 class Flags FINAL { |
24 public: | 24 public: |
25 typedef T flag_type; | 25 typedef T flag_type; |
26 typedef S mask_type; | 26 typedef S mask_type; |
27 | 27 |
28 Flags() : mask_(0) {} | 28 Flags() : mask_(0) {} |
29 Flags(flag_type flag) : mask_(flag) {} // NOLINT(runtime/explicit) | 29 Flags(flag_type flag) : mask_(flag) {} // NOLINT(runtime/explicit) |
30 explicit Flags(mask_type mask) : mask_(mask) {} | 30 explicit Flags(mask_type mask) : mask_(mask) {} |
31 | 31 |
32 Flags& operator&=(const Flags& flags) { | 32 Flags& operator&=(const Flags& flags) { |
33 mask_ &= flags.mask_; | 33 mask_ &= flags.mask_; |
(...skipping 26 matching lines...) Expand all Loading... |
60 bool operator!() const { return !mask_; } | 60 bool operator!() const { return !mask_; } |
61 | 61 |
62 private: | 62 private: |
63 mask_type mask_; | 63 mask_type mask_; |
64 }; | 64 }; |
65 | 65 |
66 | 66 |
67 #define DEFINE_OPERATORS_FOR_FLAGS(Type) \ | 67 #define DEFINE_OPERATORS_FOR_FLAGS(Type) \ |
68 inline ::v8::base::Flags<Type::flag_type> operator&( \ | 68 inline ::v8::base::Flags<Type::flag_type> operator&( \ |
69 Type::flag_type lhs, \ | 69 Type::flag_type lhs, \ |
70 Type::flag_type rhs)V8_UNUSED V8_WARN_UNUSED_RESULT; \ | 70 Type::flag_type rhs)ALLOW_UNUSED WARN_UNUSED_RESULT; \ |
71 inline ::v8::base::Flags<Type::flag_type> operator&(Type::flag_type lhs, \ | 71 inline ::v8::base::Flags<Type::flag_type> operator&(Type::flag_type lhs, \ |
72 Type::flag_type rhs) { \ | 72 Type::flag_type rhs) { \ |
73 return ::v8::base::Flags<Type::flag_type>(lhs) & rhs; \ | 73 return ::v8::base::Flags<Type::flag_type>(lhs) & rhs; \ |
74 } \ | 74 } \ |
75 inline ::v8::base::Flags<Type::flag_type> operator&( \ | 75 inline ::v8::base::Flags<Type::flag_type> operator&( \ |
76 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) \ | 76 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) \ |
77 V8_UNUSED V8_WARN_UNUSED_RESULT; \ | 77 ALLOW_UNUSED WARN_UNUSED_RESULT; \ |
78 inline ::v8::base::Flags<Type::flag_type> operator&( \ | 78 inline ::v8::base::Flags<Type::flag_type> operator&( \ |
79 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) { \ | 79 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) { \ |
80 return rhs & lhs; \ | 80 return rhs & lhs; \ |
81 } \ | 81 } \ |
82 inline void operator&(Type::flag_type lhs, Type::mask_type rhs)V8_UNUSED; \ | 82 inline void operator&(Type::flag_type lhs, Type::mask_type rhs)ALLOW_UNUSED; \ |
83 inline void operator&(Type::flag_type lhs, Type::mask_type rhs) {} \ | 83 inline void operator&(Type::flag_type lhs, Type::mask_type rhs) {} \ |
84 inline ::v8::base::Flags<Type::flag_type> operator|(Type::flag_type lhs, \ | 84 inline ::v8::base::Flags<Type::flag_type> operator|(Type::flag_type lhs, \ |
85 Type::flag_type rhs) \ | 85 Type::flag_type rhs) \ |
86 V8_UNUSED V8_WARN_UNUSED_RESULT; \ | 86 ALLOW_UNUSED WARN_UNUSED_RESULT; \ |
87 inline ::v8::base::Flags<Type::flag_type> operator|(Type::flag_type lhs, \ | 87 inline ::v8::base::Flags<Type::flag_type> operator|(Type::flag_type lhs, \ |
88 Type::flag_type rhs) { \ | 88 Type::flag_type rhs) { \ |
89 return ::v8::base::Flags<Type::flag_type>(lhs) | rhs; \ | 89 return ::v8::base::Flags<Type::flag_type>(lhs) | rhs; \ |
90 } \ | 90 } \ |
91 inline ::v8::base::Flags<Type::flag_type> operator|( \ | 91 inline ::v8::base::Flags<Type::flag_type> operator|( \ |
92 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) \ | 92 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) \ |
93 V8_UNUSED V8_WARN_UNUSED_RESULT; \ | 93 ALLOW_UNUSED WARN_UNUSED_RESULT; \ |
94 inline ::v8::base::Flags<Type::flag_type> operator|( \ | 94 inline ::v8::base::Flags<Type::flag_type> operator|( \ |
95 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) { \ | 95 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) { \ |
96 return rhs | lhs; \ | 96 return rhs | lhs; \ |
97 } \ | 97 } \ |
98 inline void operator|(Type::flag_type lhs, Type::mask_type rhs) V8_UNUSED; \ | 98 inline void operator|(Type::flag_type lhs, Type::mask_type rhs) \ |
| 99 ALLOW_UNUSED; \ |
99 inline void operator|(Type::flag_type lhs, Type::mask_type rhs) {} \ | 100 inline void operator|(Type::flag_type lhs, Type::mask_type rhs) {} \ |
100 inline ::v8::base::Flags<Type::flag_type> operator^(Type::flag_type lhs, \ | 101 inline ::v8::base::Flags<Type::flag_type> operator^(Type::flag_type lhs, \ |
101 Type::flag_type rhs) \ | 102 Type::flag_type rhs) \ |
102 V8_UNUSED V8_WARN_UNUSED_RESULT; \ | 103 ALLOW_UNUSED WARN_UNUSED_RESULT; \ |
103 inline ::v8::base::Flags<Type::flag_type> operator^(Type::flag_type lhs, \ | 104 inline ::v8::base::Flags<Type::flag_type> operator^(Type::flag_type lhs, \ |
104 Type::flag_type rhs) { \ | 105 Type::flag_type rhs) { \ |
105 return ::v8::base::Flags<Type::flag_type>(lhs) ^ rhs; \ | 106 return ::v8::base::Flags<Type::flag_type>(lhs) ^ rhs; \ |
106 } inline ::v8::base::Flags<Type::flag_type> \ | 107 } inline ::v8::base::Flags<Type::flag_type> \ |
107 operator^(Type::flag_type lhs, \ | 108 operator^(Type::flag_type lhs, \ |
108 const ::v8::base::Flags<Type::flag_type>& rhs) \ | 109 const ::v8::base::Flags<Type::flag_type>& rhs) \ |
109 V8_UNUSED V8_WARN_UNUSED_RESULT; \ | 110 ALLOW_UNUSED WARN_UNUSED_RESULT; \ |
110 inline ::v8::base::Flags<Type::flag_type> operator^( \ | 111 inline ::v8::base::Flags<Type::flag_type> operator^( \ |
111 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) { \ | 112 Type::flag_type lhs, const ::v8::base::Flags<Type::flag_type>& rhs) { \ |
112 return rhs ^ lhs; \ | 113 return rhs ^ lhs; \ |
113 } inline void operator^(Type::flag_type lhs, Type::mask_type rhs) V8_UNUSED; \ | 114 } inline void operator^(Type::flag_type lhs, Type::mask_type rhs) \ |
| 115 ALLOW_UNUSED; \ |
114 inline void operator^(Type::flag_type lhs, Type::mask_type rhs) {} | 116 inline void operator^(Type::flag_type lhs, Type::mask_type rhs) {} |
115 | 117 |
116 } // namespace base | 118 } // namespace base |
117 } // namespace v8 | 119 } // namespace v8 |
118 | 120 |
119 #endif // V8_BASE_FLAGS_H_ | 121 #endif // V8_BASE_FLAGS_H_ |
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