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|---|---|---|---|
| 1 | // Copyright Contributors to the OpenVDB Project | ||
| 2 | // SPDX-License-Identifier: MPL-2.0 | ||
| 3 | |||
| 4 | /// @file NodeUnion.h | ||
| 5 | /// | ||
| 6 | /// @details NodeUnion is a templated helper class that controls access to either | ||
| 7 | /// the child node pointer or the value for a particular element of a root | ||
| 8 | /// or internal node. For space efficiency, the child pointer and the value | ||
| 9 | /// are unioned when possible, since the two are never in use simultaneously. | ||
| 10 | |||
| 11 | #ifndef OPENVDB_TREE_NODEUNION_HAS_BEEN_INCLUDED | ||
| 12 | #define OPENVDB_TREE_NODEUNION_HAS_BEEN_INCLUDED | ||
| 13 | |||
| 14 | #include <openvdb/version.h> | ||
| 15 | #include <openvdb/Types.h> | ||
| 16 | #include <cstring> // for std::memcpy() | ||
| 17 | #include <type_traits> | ||
| 18 | |||
| 19 | namespace openvdb { | ||
| 20 | OPENVDB_USE_VERSION_NAMESPACE | ||
| 21 | namespace OPENVDB_VERSION_NAME { | ||
| 22 | namespace tree { | ||
| 23 | |||
| 24 | #if OPENVDB_ABI_VERSION_NUMBER >= 8 | ||
| 25 | |||
| 26 | /// @brief Default implementation of a NodeUnion that stores the child pointer | ||
| 27 | /// and the value separately (i.e., not in a union). Types which select this | ||
| 28 | /// specialization usually do not conform to the requirements of a union | ||
| 29 | /// member, that is that the type ValueT is not trivially copyable. This | ||
| 30 | /// implementation is thus NOT used for POD, math::Vec, math::Mat, math::Quat | ||
| 31 | /// or math::Coord types, but is used (for example) with std::string | ||
| 32 | template<typename ValueT, typename ChildT, typename Enable = void> | ||
| 33 | 10129984 | class NodeUnion | |
| 34 | { | ||
| 35 | private: | ||
| 36 | ChildT* mChild; | ||
| 37 | ValueT mValue; | ||
| 38 | |||
| 39 | public: | ||
| 40 | 10203712 | NodeUnion(): mChild(nullptr), mValue() {} | |
| 41 | |||
| 42 |
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2293 | ChildT* getChild() const { return mChild; } |
| 43 |
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12 | void setChild(ChildT* child) { mChild = child; } |
| 44 | |||
| 45 |
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88599648 | const ValueT& getValue() const { return mValue; } |
| 46 |
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291 | ValueT& getValue() { return mValue; } |
| 47 |
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10216727 | void setValue(const ValueT& val) { mValue = val; } |
| 48 | |||
| 49 | // Small check to ensure this class isn't | ||
| 50 | // selected for some expected types | ||
| 51 | static_assert(!ValueTraits<ValueT>::IsVec && | ||
| 52 | !ValueTraits<ValueT>::IsMat && | ||
| 53 | !ValueTraits<ValueT>::IsQuat && | ||
| 54 | !std::is_same<ValueT, math::Coord>::value && | ||
| 55 | !std::is_arithmetic<ValueT>::value, | ||
| 56 | "Unexpected instantiation of NodeUnion"); | ||
| 57 | }; | ||
| 58 | |||
| 59 | /// @brief Template specialization of a NodeUnion that stores the child pointer | ||
| 60 | /// and the value together (int, float, pointer, etc.) | ||
| 61 | template<typename ValueT, typename ChildT> | ||
| 62 | class NodeUnion<ValueT, ChildT, | ||
| 63 | typename std::enable_if<std::is_trivially_copyable<ValueT>::value>::type> | ||
| 64 | { | ||
| 65 | private: | ||
| 66 | union { ChildT* mChild; ValueT mValue; }; | ||
| 67 | |||
| 68 | public: | ||
| 69 | 3762358080 | NodeUnion(): mChild(nullptr) {} | |
| 70 | |||
| 71 |
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646151123 | ChildT* getChild() const { return mChild; } |
| 72 | 22067261 | void setChild(ChildT* child) { mChild = child; } | |
| 73 | |||
| 74 |
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6958678818 | const ValueT& getValue() const { return mValue; } |
| 75 |
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190641916 | ValueT& getValue() { return mValue; } |
| 76 |
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3911645699 | void setValue(const ValueT& val) { mValue = val; } |
| 77 | }; | ||
| 78 | |||
| 79 | #else | ||
| 80 | |||
| 81 | // Forward declaration of traits class | ||
| 82 | template<typename T> struct CopyTraits; | ||
| 83 | |||
| 84 | // Default implementation that stores the child pointer and the value separately | ||
| 85 | // (i.e., not in a union) | ||
| 86 | // This implementation is not used for POD, math::Vec or math::Coord value types. | ||
| 87 | template<typename ValueT, typename ChildT, typename Enable = void> | ||
| 88 | class NodeUnion | ||
| 89 | { | ||
| 90 | private: | ||
| 91 | ChildT* mChild; | ||
| 92 | ValueT mValue; | ||
| 93 | |||
| 94 | public: | ||
| 95 | NodeUnion(): mChild(nullptr), mValue() {} | ||
| 96 | |||
| 97 | ChildT* getChild() const { return mChild; } | ||
| 98 | void setChild(ChildT* child) { mChild = child; } | ||
| 99 | |||
| 100 | const ValueT& getValue() const { return mValue; } | ||
| 101 | ValueT& getValue() { return mValue; } | ||
| 102 | void setValue(const ValueT& val) { mValue = val; } | ||
| 103 | }; | ||
| 104 | |||
| 105 | |||
| 106 | // Template specialization for values of POD types (int, float, pointer, etc.) | ||
| 107 | template<typename ValueT, typename ChildT> | ||
| 108 | class NodeUnion<ValueT, ChildT, typename std::enable_if<std::is_pod<ValueT>::value>::type> | ||
| 109 | { | ||
| 110 | private: | ||
| 111 | union { ChildT* mChild; ValueT mValue; }; | ||
| 112 | |||
| 113 | public: | ||
| 114 | NodeUnion(): mChild(nullptr) {} | ||
| 115 | |||
| 116 | ChildT* getChild() const { return mChild; } | ||
| 117 | void setChild(ChildT* child) { mChild = child; } | ||
| 118 | |||
| 119 | const ValueT& getValue() const { return mValue; } | ||
| 120 | ValueT& getValue() { return mValue; } | ||
| 121 | void setValue(const ValueT& val) { mValue = val; } | ||
| 122 | }; | ||
| 123 | |||
| 124 | |||
| 125 | // Template specialization for values of types such as math::Vec3f and math::Coord | ||
| 126 | // for which CopyTraits<T>::IsCopyable is true | ||
| 127 | template<typename ValueT, typename ChildT> | ||
| 128 | class NodeUnion<ValueT, ChildT, typename std::enable_if<CopyTraits<ValueT>::IsCopyable>::type> | ||
| 129 | { | ||
| 130 | private: | ||
| 131 | union { ChildT* mChild; ValueT mValue; }; | ||
| 132 | |||
| 133 | public: | ||
| 134 | NodeUnion(): mChild(nullptr) {} | ||
| 135 | NodeUnion(const NodeUnion& other): mChild(nullptr) | ||
| 136 | { std::memcpy(static_cast<void*>(this), &other, sizeof(*this)); } | ||
| 137 | NodeUnion& operator=(const NodeUnion& rhs) | ||
| 138 | { std::memcpy(static_cast<void*>(this), &rhs, sizeof(*this)); return *this; } | ||
| 139 | |||
| 140 | ChildT* getChild() const { return mChild; } | ||
| 141 | void setChild(ChildT* child) { mChild = child; } | ||
| 142 | |||
| 143 | const ValueT& getValue() const { return mValue; } | ||
| 144 | ValueT& getValue() { return mValue; } | ||
| 145 | void setValue(const ValueT& val) { mValue = val; } | ||
| 146 | }; | ||
| 147 | |||
| 148 | |||
| 149 | /// @details A type T is copyable if | ||
| 150 | /// # T stores member values by value (vs. by pointer or reference) | ||
| 151 | /// and T's true byte size is given by sizeof(T). | ||
| 152 | /// # T has a trivial destructor | ||
| 153 | /// # T has a default constructor | ||
| 154 | /// # T has an assignment operator | ||
| 155 | template<typename T> struct CopyTraits { static const bool IsCopyable = false; }; | ||
| 156 | template<typename T> struct CopyTraits<math::Vec2<T>> { static const bool IsCopyable = true; }; | ||
| 157 | template<typename T> struct CopyTraits<math::Vec3<T>> { static const bool IsCopyable = true; }; | ||
| 158 | template<typename T> struct CopyTraits<math::Vec4<T>> { static const bool IsCopyable = true; }; | ||
| 159 | template<> struct CopyTraits<math::Coord> { static const bool IsCopyable = true; }; | ||
| 160 | |||
| 161 | #endif | ||
| 162 | |||
| 163 | //////////////////////////////////////// | ||
| 164 | |||
| 165 | |||
| 166 | } // namespace tree | ||
| 167 | } // namespace OPENVDB_VERSION_NAME | ||
| 168 | } // namespace openvdb | ||
| 169 | |||
| 170 | #endif // OPENVDB_TREE_NODEUNION_HAS_BEEN_INCLUDED | ||
| 171 |