1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
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8 //
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10 // notice, this list of conditions and the following disclaimer.
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13 // in the documentation and/or other materials provided with the
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30
31 #ifndef GOOGLE_PROTOBUF_HAS_BITS_H__
32 #define GOOGLE_PROTOBUF_HAS_BITS_H__
33
34 #include <google/protobuf/stubs/common.h>
35 #include <google/protobuf/port.h>
36
37 #include <google/protobuf/port_def.inc>
38
39 #ifdef SWIG
40 #error "You cannot SWIG proto headers"
41 #endif
42
43 namespace google {
44 namespace protobuf {
45 namespace internal {
46
47 template <size_t doublewords>
48 class HasBits {
49 public:
HasBits()50 PROTOBUF_NDEBUG_INLINE constexpr HasBits() : has_bits_{} {}
51
Clear()52 PROTOBUF_NDEBUG_INLINE void Clear() {
53 memset(has_bits_, 0, sizeof(has_bits_));
54 }
55
56 PROTOBUF_NDEBUG_INLINE uint32& operator[](int index) {
57 return has_bits_[index];
58 }
59
60 PROTOBUF_NDEBUG_INLINE const uint32& operator[](int index) const {
61 return has_bits_[index];
62 }
63
64 bool operator==(const HasBits<doublewords>& rhs) const {
65 return memcmp(has_bits_, rhs.has_bits_, sizeof(has_bits_)) == 0;
66 }
67
68 bool operator!=(const HasBits<doublewords>& rhs) const {
69 return !(*this == rhs);
70 }
71
Or(const HasBits<doublewords> & rhs)72 void Or(const HasBits<doublewords>& rhs) {
73 for (size_t i = 0; i < doublewords; i++) has_bits_[i] |= rhs[i];
74 }
75
76 bool empty() const;
77
78 private:
79 uint32 has_bits_[doublewords];
80 };
81
82 template <>
empty()83 inline bool HasBits<1>::empty() const {
84 return !has_bits_[0];
85 }
86
87 template <>
empty()88 inline bool HasBits<2>::empty() const {
89 return !(has_bits_[0] | has_bits_[1]);
90 }
91
92 template <>
empty()93 inline bool HasBits<3>::empty() const {
94 return !(has_bits_[0] | has_bits_[1] | has_bits_[2]);
95 }
96
97 template <>
empty()98 inline bool HasBits<4>::empty() const {
99 return !(has_bits_[0] | has_bits_[1] | has_bits_[2] | has_bits_[3]);
100 }
101
102 template <size_t doublewords>
empty()103 inline bool HasBits<doublewords>::empty() const {
104 for (size_t i = 0; i < doublewords; ++i) {
105 if (has_bits_[i]) return false;
106 }
107 return true;
108 }
109
110 } // namespace internal
111 } // namespace protobuf
112 } // namespace google
113
114 #include <google/protobuf/port_undef.inc>
115
116 #endif // GOOGLE_PROTOBUF_HAS_BITS_H__
117