instance_ptr.hpp
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1 #pragma once
2 
3 #include <functional>
4 
5 namespace iv
6 {
7 
8 class Instance;
9 
13 class instance_ptr_interface
14 {
15 friend class Instance;
16 protected:
17  virtual void invalidate ( Instance * inst ) = 0;
18  void addSelfToSC( Instance * inst );
19  void removeSelfFromSC( Instance * inst );
20 };
21 
24 class instance_ptr : public instance_ptr_interface
25 {
26 public:
27  instance_ptr ( Instance * inst = nullptr );
28  instance_ptr ( instance_ptr const & other );
29  ~instance_ptr ( );
30 
31  instance_ptr & operator = ( instance_ptr const & other );
32  instance_ptr & operator = ( Instance * instance );
33 
34 
35  bool operator == ( instance_ptr const & other );
36  bool operator != ( instance_ptr const & other );
37  bool operator < ( instance_ptr const & other );
38  bool operator > ( instance_ptr const & other );
39  bool operator <= ( instance_ptr const & other );
40  bool operator >= ( instance_ptr const & other );
41 
42  Instance * get ( ) const;
43  Instance & operator * ( ) const;
44  Instance * operator -> ( ) const;
45  operator bool ( ) const;
46 
47 protected:
48  virtual void invalidate( Instance * inst ) override;
49 
50 private:
51  Instance * inst;
52 
53 };
54 
55 
56 
61 class callback_instance_ptr : public instance_ptr
62 {
63 public:
64 using instance_ptr::instance_ptr;
65 
66  callback_instance_ptr & operator=( callback_instance_ptr const & other );
67  callback_instance_ptr & operator=( Instance * instance );
68 
69  void set_change_callback( std::function< void() > const & );
70 
71 protected:
72  virtual void invalidate( Instance * inst ) override;
73 
74 private:
75  std::function< void() > _change_callback;
76 };
77 
78 
79 }
80 
81 namespace std
82 {
83  template<>
84  struct hash< iv::instance_ptr >
85  {
86  size_t operator()( iv::instance_ptr const & v ) const
87  {
88  return std::hash< iv::Instance * >()( v.get() );
89  }
90  };
91 }