resource.h
1 /*
2 ** ClanLib SDK
3 ** Copyright (c) 1997-2016 The ClanLib Team
4 **
5 ** This software is provided 'as-is', without any express or implied
6 ** warranty. In no event will the authors be held liable for any damages
7 ** 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
11 ** freely, subject to the following restrictions:
12 **
13 ** 1. The origin of this software must not be misrepresented; you must not
14 ** claim that you wrote the original software. If you use this software
15 ** in a product, an acknowledgment in the product documentation would be
16 ** appreciated but is not required.
17 ** 2. Altered source versions must be plainly marked as such, and must not be
18 ** misrepresented as being the original software.
19 ** 3. This notice may not be removed or altered from any source distribution.
20 **
21 ** Note: Some of the libraries ClanLib may link to may have additional
22 ** requirements or restrictions.
23 **
24 ** File Author(s):
25 **
26 ** Magnus Norddahl
27 */
28 
29 #pragma once
30 
31 #include <memory>
32 #include <map>
33 
34 namespace clan
35 {
38 
40  {
41  public:
42  virtual ~Resource_BaseImpl() { }
43  };
44 
45  template<typename Type>
47  {
48  public:
50  Resource_Impl(const Type &initial_value) : value(initial_value), generation(0) { }
51  Type value;
53  };
54 
56  template<typename Type>
57  class Resource
58  {
59  public:
61  : object(new Resource_Impl<Type>()), generation(-1)
62  {
63  }
64 
65  Resource(std::shared_ptr<Resource_Impl<Type> > object)
66  : object(object), generation(-1)
67  {
68  }
69 
70  Resource(const Type &initial_value)
71  : object(new Resource_Impl<Type>(initial_value)), generation(-1)
72  {
73  }
74 
75  Type *operator->()
76  {
77  return &object->value;
78  }
79 
80  const Type *operator->() const
81  {
82  return &object->value;
83  }
84 
85  bool updated()
86  {
87  bool updated = (generation != object->generation);
88  generation = object->generation;
89  return updated;
90  }
91 
92  void set(const Type &value)
93  {
94  object->value = value;
95  generation = ++object->generation;
96  }
97 
98  Type &get()
99  {
100  return object->value;
101  }
102 
103  const Type &get() const
104  {
105  return object->value;
106  }
107 
108  operator Type&() { return object->value; }
109  operator const Type&() const { return object->value; }
110 
111  const std::shared_ptr<Resource_Impl<Type> > &handle() const { return object; }
112 
113  bool operator<(const Resource &other) const { return object < other.object; }
114  bool operator<=(const Resource &other) const { return object <= other.object; }
115  bool operator>(const Resource &other) const { return object > other.object; }
116  bool operator>=(const Resource &other) const { return object >= other.object; }
117  bool operator==(const Resource &other) const { return object == other.object; }
118  bool operator!=(const Resource &other) const { return object != other.object; }
119 
120  private:
121  std::shared_ptr<Resource_Impl<Type> > object;
122  int generation;
123  };
124 
126 }
Definition: clanapp.h:35
bool operator==(const Resource &other) const
Definition: resource.h:117
Resource proxy of a specific type.
Definition: resource.h:57
bool operator<=(const Resource &other) const
Definition: resource.h:114
Resource(std::shared_ptr< Resource_Impl< Type > > object)
Definition: resource.h:65
const Type * operator->() const
Definition: resource.h:80
Resource(const Type &initial_value)
Definition: resource.h:70
bool operator!=(const Resource &other) const
Definition: resource.h:118
Resource_Impl()
Definition: resource.h:49
Type value
Definition: resource.h:51
Resource_Impl(const Type &initial_value)
Definition: resource.h:50
Definition: resource.h:39
int generation
Definition: resource.h:52
bool updated()
Definition: resource.h:85
Type * operator->()
Definition: resource.h:75
bool operator>(const Resource &other) const
Definition: resource.h:115
const std::shared_ptr< Resource_Impl< Type > > & handle() const
Definition: resource.h:111
bool operator<(const Resource &other) const
Definition: resource.h:113
virtual ~Resource_BaseImpl()
Definition: resource.h:42
Definition: resource.h:46
Resource()
Definition: resource.h:60
void set(const Type &value)
Definition: resource.h:92
bool operator>=(const Resource &other) const
Definition: resource.h:116