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   1 ////////////////////////////////////////////////////////////
   2 //
   3 // SFML - Simple and Fast Multimedia Library
   4 // Copyright (C) 2007-2013 Laurent Gomila (laurent.gom@gmail.com)
   5 //
   6 // This software is provided 'as-is', without any express or implied warranty.
   7 // In no event will the authors be held liable for any damages arising from the use of this software.
   8 //
   9 // Permission is granted to anyone to use this software for any purpose,
  10 // including commercial applications, and to alter it and redistribute it freely,
  11 // subject to the following restrictions:
  12 //
  13 // 1. The origin of this software must not be misrepresented;
  14 //    you must not claim that you wrote the original software.
  15 //    If you use this software in a product, an acknowledgment
  16 //    in the product documentation would be appreciated but is not required.
  17 //
  18 // 2. Altered source versions must be plainly marked as such,
  19 //    and must not be misrepresented as being the original software.
  20 //
  21 // 3. This notice may not be removed or altered from any source distribution.
  22 //
  23 ////////////////////////////////////////////////////////////
  24
  25 #ifndef SFML_THREADLOCALPTR_HPP
  26 #define SFML_THREADLOCALPTR_HPP
  27
  28 ////////////////////////////////////////////////////////////
  29 // Headers
  30 ////////////////////////////////////////////////////////////
  31 #include <SFML/System/ThreadLocal.hpp>
  32
  33
  34 namespace sf
  35 {
  36 ////////////////////////////////////////////////////////////
  37 /// \brief Pointer to a thread-local variable
  38 ///
  39 ////////////////////////////////////////////////////////////
  40 template <typename T>
  41 class ThreadLocalPtr : private ThreadLocal
  42 {
  43 public :
  44
  45     ////////////////////////////////////////////////////////////
  46     /// \brief Default constructor
  47     ///
  48     /// \param value Optional value to initalize the variable
  49     ///
  50     ////////////////////////////////////////////////////////////
  51     ThreadLocalPtr(T* value = NULL);
  52
  53     ////////////////////////////////////////////////////////////
  54     /// \brief Overload of unary operator *
  55     ///
  56     /// Like raw pointers, applying the * operator returns a
  57     /// reference to the pointed object.
  58     ///
  59     /// \return Reference to the pointed object
  60     ///
  61     ////////////////////////////////////////////////////////////
  62     T& operator *() const;
  63
  64     ////////////////////////////////////////////////////////////
  65     /// \brief Overload of operator ->
  66     ///
  67     /// Like raw pointers, applying the -> operator returns the
  68     /// pointed object.
  69     ///
  70     /// \return Pointed object
  71     ///
  72     ////////////////////////////////////////////////////////////
  73     T* operator ->() const;
  74
  75     ////////////////////////////////////////////////////////////
  76     /// \brief Cast operator to implicitely convert the
  77     ///        pointer to its raw pointer type (T*)
  78     ///
  79     /// \return Pointer to the actual object
  80     ///
  81     ////////////////////////////////////////////////////////////
  82     operator T*() const;
  83
  84     ////////////////////////////////////////////////////////////
  85     /// \brief Assignment operator for a raw pointer parameter
  86     ///
  87     /// \param value Pointer to assign
  88     ///
  89     /// \return Reference to self
  90     ///
  91     ////////////////////////////////////////////////////////////
  92     ThreadLocalPtr<T>& operator =(T* value);
  93
  94     ////////////////////////////////////////////////////////////
  95     /// \brief Assignment operator for a ThreadLocalPtr parameter
  96     ///
  97     /// \param right ThreadLocalPtr to assign
  98     ///
  99     /// \return Reference to self
 100     ///
 101     ////////////////////////////////////////////////////////////
 102     ThreadLocalPtr<T>& operator =(const ThreadLocalPtr<T>& right);
 103 };
 104
 105 } // namespace sf
 106
 107 #include <SFML/System/ThreadLocalPtr.inl>
 108
 109
 110 #endif // SFML_THREADLOCALPTR_HPP
 111
 112
 113 ////////////////////////////////////////////////////////////
 114 /// \class sf::ThreadLocalPtr
 115 /// \ingroup system
 116 ///
 117 /// sf::ThreadLocalPtr is a type-safe wrapper for storing
 118 /// pointers to thread-local variables. A thread-local
 119 /// variable holds a different value for each different
 120 /// thread, unlike normal variable that are shared.
 121 ///
 122 /// Its usage is completely transparent, so that it is similar
 123 /// to manipulating the raw pointer directly (like any smart pointer).
 124 ///
 125 /// Usage example:
 126 /// \code
 127 /// MyClass object1;
 128 /// MyClass object2;
 129 /// sf::ThreadLocalPtr<MyClass> objectPtr;
 130 ///
 131 /// void thread1()
 132 /// {
 133 ///     objectPtr = &object1; // doesn't impact thread2
 134 ///     ...
 135 /// }
 136 ///
 137 /// void thread2()
 138 /// {
 139 ///     objectPtr = &object2; // doesn't impact thread1
 140 ///     ...
 141 /// }
 142 ///
 143 /// int main()
 144 /// {
 145 ///     // Create and launch the two threads
 146 ///     sf::Thread t1(&thread1);
 147 ///     sf::Thread t2(&thread2);
 148 ///     t1.launch();
 149 ///     t2.launch();
 150 ///
 151 ///     return 0;
 152 /// }
 153 /// \endcode
 154 ///
 155 /// ThreadLocalPtr is designed for internal use; however you
 156 /// can use it if you feel like it fits well your implementation.
 157 ///
 158 ////////////////////////////////////////////////////////////