JointConf.hpp
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1 /*
2  * Original work Copyright (c) 2006-2007 Erin Catto http://www.box2d.org
3  * Modified work Copyright (c) 2017 Louis Langholtz https://github.com/louis-langholtz/PlayRho
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 
22 #ifndef PLAYRHO_DYNAMICS_JOINTS_JOINTCONF_HPP
23 #define PLAYRHO_DYNAMICS_JOINTS_JOINTCONF_HPP
24 
25 #include <PlayRho/Dynamics/Joints/JointType.hpp>
26 #include <cstdint>
27 
28 namespace playrho {
29 namespace d2 {
30 
31 class Body;
32 class Joint;
33 
38 struct JointConf
39 {
41  JointConf() = delete; // deleted to prevent direct instantiation.
42 
44  PLAYRHO_CONSTEXPR inline explicit JointConf(JointType t) noexcept : type{t}
45  {
46  // Intentionally empty.
47  }
48 
50  JointType type = JointType::Unknown;
51 
53  Body* bodyA = nullptr;
54 
56  Body* bodyB = nullptr;
57 
60  bool collideConnected = false;
61 
64  void* userData = nullptr;
65 };
66 
74 template <class T>
75 struct JointBuilder : JointConf
76 {
77 
79  using value_type = T;
80 
82  using reference = value_type&;
83 
85  PLAYRHO_CONSTEXPR inline explicit JointBuilder(JointType t) noexcept : JointConf{t}
86  {
87  // Intentionally empty.
88  }
89 
91  PLAYRHO_CONSTEXPR inline reference UseBodyA(Body* b) noexcept
92  {
93  bodyA = b;
94  return static_cast<reference>(*this);
95  }
96 
98  PLAYRHO_CONSTEXPR inline reference UseBodyB(Body* b) noexcept
99  {
100  bodyB = b;
101  return static_cast<reference>(*this);
102  }
103 
105  PLAYRHO_CONSTEXPR inline reference UseCollideConnected(bool v) noexcept
106  {
107  collideConnected = v;
108  return static_cast<reference>(*this);
109  }
110 
112  PLAYRHO_CONSTEXPR inline reference UseUserData(void* v) noexcept
113  {
114  userData = v;
115  return static_cast<reference>(*this);
116  }
117 };
118 
121 void Set(JointConf& def, const Joint& joint) noexcept;
122 
123 } // namespace d2
124 } // namespace playrho
125 
126 #endif // PLAYRHO_DYNAMICS_JOINTS_JOINTCONF_HPP