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annotate libs/assimp/boost/shared_array.hpp @ 1:e7ca128b8713

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looks nice :)
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 00:35:22 +0200
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nuclear@0 1
nuclear@0 2 #ifndef INCLUDED_AI_BOOST_SHARED_ARRAY
nuclear@0 3 #define INCLUDED_AI_BOOST_SHARED_ARRAY
nuclear@0 4
nuclear@0 5 #ifndef BOOST_SCOPED_ARRAY_HPP_INCLUDED
nuclear@0 6
nuclear@0 7 // ------------------------------
nuclear@0 8 // Internal stub
nuclear@0 9 namespace boost {
nuclear@0 10 namespace array_detail {
nuclear@0 11 class controller {
nuclear@0 12 public:
nuclear@0 13
nuclear@0 14 controller()
nuclear@0 15 : cnt(1)
nuclear@0 16 {}
nuclear@0 17
nuclear@0 18 public:
nuclear@0 19
nuclear@0 20 template <typename T>
nuclear@0 21 controller* decref(T* pt) {
nuclear@0 22 if (--cnt <= 0) {
nuclear@0 23 delete this;
nuclear@0 24 delete[] pt;
nuclear@0 25 }
nuclear@0 26 return NULL;
nuclear@0 27 }
nuclear@0 28
nuclear@0 29 controller* incref() {
nuclear@0 30 ++cnt;
nuclear@0 31 return this;
nuclear@0 32 }
nuclear@0 33
nuclear@0 34 long get() const {
nuclear@0 35 return cnt;
nuclear@0 36 }
nuclear@0 37
nuclear@0 38 private:
nuclear@0 39 long cnt;
nuclear@0 40 };
nuclear@0 41
nuclear@0 42 struct empty {};
nuclear@0 43
nuclear@0 44 template <typename DEST, typename SRC>
nuclear@0 45 struct is_convertible_stub {
nuclear@0 46
nuclear@0 47 struct yes {char s[1];};
nuclear@0 48 struct no {char s[2];};
nuclear@0 49
nuclear@0 50 static yes foo(DEST*);
nuclear@0 51 static no foo(...);
nuclear@0 52
nuclear@0 53 enum {result = (sizeof(foo((SRC*)0)) == sizeof(yes) ? 1 : 0)};
nuclear@0 54 };
nuclear@0 55
nuclear@0 56 template <bool> struct enable_if {};
nuclear@0 57 template <> struct enable_if<true> {
nuclear@0 58 typedef empty result;
nuclear@0 59 };
nuclear@0 60
nuclear@0 61 template <typename DEST, typename SRC>
nuclear@0 62 struct is_convertible : public enable_if<is_convertible_stub<DEST,SRC>::result > {
nuclear@0 63 };
nuclear@0 64 }
nuclear@0 65
nuclear@0 66 // ------------------------------
nuclear@0 67 // Small replacement for boost::shared_array, not threadsafe because no
nuclear@0 68 // atomic reference counter is in use.
nuclear@0 69 // ------------------------------
nuclear@0 70 template <class T>
nuclear@0 71 class shared_array
nuclear@0 72 {
nuclear@0 73 template <typename TT> friend class shared_array;
nuclear@0 74
nuclear@0 75 template<class TT> friend bool operator== (const shared_array<TT>& a, const shared_array<TT>& b);
nuclear@0 76 template<class TT> friend bool operator!= (const shared_array<TT>& a, const shared_array<TT>& b);
nuclear@0 77 template<class TT> friend bool operator< (const shared_array<TT>& a, const shared_array<TT>& b);
nuclear@0 78
nuclear@0 79 public:
nuclear@0 80
nuclear@0 81 typedef T element_type;
nuclear@0 82
nuclear@0 83 public:
nuclear@0 84
nuclear@0 85 // provide a default constructor
nuclear@0 86 shared_array()
nuclear@0 87 : ptr()
nuclear@0 88 , ctr(NULL)
nuclear@0 89 {
nuclear@0 90 }
nuclear@0 91
nuclear@0 92 // construction from an existing object of type T
nuclear@0 93 explicit shared_array(T* ptr)
nuclear@0 94 : ptr(ptr)
nuclear@0 95 , ctr(ptr ? new array_detail::controller() : NULL)
nuclear@0 96 {
nuclear@0 97 }
nuclear@0 98
nuclear@0 99 shared_array(const shared_array& r)
nuclear@0 100 : ptr(r.ptr)
nuclear@0 101 , ctr(r.ctr ? r.ctr->incref() : NULL)
nuclear@0 102 {
nuclear@0 103 }
nuclear@0 104
nuclear@0 105 template <typename Y>
nuclear@0 106 shared_array(const shared_array<Y>& r,typename detail::is_convertible<T,Y>::result = detail::empty())
nuclear@0 107 : ptr(r.ptr)
nuclear@0 108 , ctr(r.ctr ? r.ctr->incref() : NULL)
nuclear@0 109 {
nuclear@0 110 }
nuclear@0 111
nuclear@0 112 // automatic destruction of the wrapped object when all
nuclear@0 113 // references are freed.
nuclear@0 114 ~shared_array() {
nuclear@0 115 if (ctr) {
nuclear@0 116 ctr = ctr->decref(ptr);
nuclear@0 117 }
nuclear@0 118 }
nuclear@0 119
nuclear@0 120 shared_array& operator=(const shared_array& r) {
nuclear@0 121 if (this == &r) {
nuclear@0 122 return *this;
nuclear@0 123 }
nuclear@0 124 if (ctr) {
nuclear@0 125 ctr->decref(ptr);
nuclear@0 126 }
nuclear@0 127 ptr = r.ptr;
nuclear@0 128 ctr = ptr?r.ctr->incref():NULL;
nuclear@0 129 return *this;
nuclear@0 130 }
nuclear@0 131
nuclear@0 132 template <typename Y>
nuclear@0 133 shared_array& operator=(const shared_array<Y>& r) {
nuclear@0 134 if (this == &r) {
nuclear@0 135 return *this;
nuclear@0 136 }
nuclear@0 137 if (ctr) {
nuclear@0 138 ctr->decref(ptr);
nuclear@0 139 }
nuclear@0 140 ptr = r.ptr;
nuclear@0 141 ctr = ptr?r.ctr->incref():NULL;
nuclear@0 142 return *this;
nuclear@0 143 }
nuclear@0 144
nuclear@0 145 // pointer access
nuclear@0 146 inline operator T*() {
nuclear@0 147 return ptr;
nuclear@0 148 }
nuclear@0 149
nuclear@0 150 inline T* operator-> () const {
nuclear@0 151 return ptr;
nuclear@0 152 }
nuclear@0 153
nuclear@0 154 // standard semantics
nuclear@0 155 inline T* get() {
nuclear@0 156 return ptr;
nuclear@0 157 }
nuclear@0 158
nuclear@0 159 T& operator[] (std::ptrdiff_t index) const {
nuclear@0 160 return ptr[index];
nuclear@0 161 }
nuclear@0 162
nuclear@0 163 inline const T* get() const {
nuclear@0 164 return ptr;
nuclear@0 165 }
nuclear@0 166
nuclear@0 167 inline operator bool () const {
nuclear@0 168 return ptr != NULL;
nuclear@0 169 }
nuclear@0 170
nuclear@0 171 inline bool unique() const {
nuclear@0 172 return use_count() == 1;
nuclear@0 173 }
nuclear@0 174
nuclear@0 175 inline long use_count() const {
nuclear@0 176 return ctr->get();
nuclear@0 177 }
nuclear@0 178
nuclear@0 179 inline void reset (T* t = 0) {
nuclear@0 180 if (ctr) {
nuclear@0 181 ctr->decref(ptr);
nuclear@0 182 }
nuclear@0 183 ptr = t;
nuclear@0 184 ctr = ptr?new array_detail::controller():NULL;
nuclear@0 185 }
nuclear@0 186
nuclear@0 187 void swap(shared_array & b) {
nuclear@0 188 std::swap(ptr, b.ptr);
nuclear@0 189 std::swap(ctr, b.ctr);
nuclear@0 190 }
nuclear@0 191
nuclear@0 192
nuclear@0 193 private:
nuclear@0 194
nuclear@0 195 // encapsulated object pointer
nuclear@0 196 T* ptr;
nuclear@0 197
nuclear@0 198 // control block
nuclear@0 199 array_detail::controller* ctr;
nuclear@0 200 };
nuclear@0 201
nuclear@0 202 template<class T>
nuclear@0 203 inline void swap(shared_array<T> & a, shared_array<T> & b)
nuclear@0 204 {
nuclear@0 205 a.swap(b);
nuclear@0 206 }
nuclear@0 207
nuclear@0 208 template<class T>
nuclear@0 209 bool operator== (const shared_array<T>& a, const shared_array<T>& b) {
nuclear@0 210 return a.ptr == b.ptr;
nuclear@0 211 }
nuclear@0 212 template<class T>
nuclear@0 213 bool operator!= (const shared_array<T>& a, const shared_array<T>& b) {
nuclear@0 214 return a.ptr != b.ptr;
nuclear@0 215 }
nuclear@0 216
nuclear@0 217 template<class T>
nuclear@0 218 bool operator< (const shared_array<T>& a, const shared_array<T>& b) {
nuclear@0 219 return a.ptr < b.ptr;
nuclear@0 220 }
nuclear@0 221
nuclear@0 222
nuclear@0 223 } // end of namespace boost
nuclear@0 224
nuclear@0 225 #else
nuclear@0 226 # error "shared_array.h was already included"
nuclear@0 227 #endif
nuclear@0 228 #endif // INCLUDED_AI_BOOST_SHARED_ARRAY