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+/************************************************************************************
+
+Filename    :   OVR_Delegates.h
+Content     :   C++ Delegates
+Created     :   June 15, 2014
+Authors     :   Chris Taylor
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License");
+you may not use the Oculus VR Rift SDK except in compliance with the License,
+which is provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+************************************************************************************/
+
+/*
+	Based on The Impossibly Fast C++ Delegates by Sergey Ryazanov from
+	http://www.codeproject.com/KB/cpp/ImpossiblyFastCppDelegate.aspx (2005)
+*/
+
+/*
+	Usage:
+
+	Declare a delegate with a void (int) signature, also known as a
+	function that returns void and has one parameter that is an int:
+		typedef Delegate1<void, int> MyDelegate;
+		MyDelegate d;
+
+	Point the delegate to a member function:
+		d.SetMember<A, &A::TestFunctionA>(&a);
+		d = MyDelegate::FromMember<A, &A::TestFunctionA>(&a);
+
+	Point the delegate to a const member function:
+		d.SetConstMember<C, &C::TestFunctionA>(&c);
+		d = MyDelegate::FromConstMember<C, &C::TestFunctionA>(&c);
+
+	Point the delegate to a free function:
+		d.SetFree<&FreeFunctionX>();
+		d = MyDelegate::FromFree<&FreeFunctionX>();
+
+	Invoke the function via the delegate (works for all 3 cases):
+		d(1000);
+
+	By default the delegates are uninitialized.
+	To clear an array of delegates quickly just zero the memory.
+
+	This implementation is nicer than FastDelegates in my opinion
+	because it is simple and easy to read.  It is a little slower
+	for virtual functions, but the size of the delegate is small,
+	and it will only get better as compilers improve.
+*/
+
+#ifndef OVR_Delegates_h
+#define OVR_Delegates_h
+
+#include "OVR_Types.h"
+
+namespace OVR {
+
+
+template <class ret_type>
+class Delegate0
+{
+	typedef ret_type (*StubPointer)(void *);
+	typedef Delegate0<ret_type> this_type;
+
+	void *_object;
+	StubPointer _stub;
+
+	OVR_FORCE_INLINE Delegate0(void *object, StubPointer stub)
+	{
+		_object = object;
+		_stub = stub;
+	}
+
+	// Stubs
+
+	template <ret_type (*F)()>
+	static OVR_FORCE_INLINE ret_type FreeStub(void *object)
+	{
+		return (F)();
+	}
+
+	template <class T, ret_type (T::*F)()>
+	static OVR_FORCE_INLINE ret_type MemberStub(void *object)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)();
+	}
+
+	template <class T, ret_type (T::*F)() const>
+	static OVR_FORCE_INLINE ret_type ConstMemberStub(void *object)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)();
+	}
+
+public:
+	OVR_FORCE_INLINE Delegate0() {}
+
+	// Function invocation
+
+	OVR_FORCE_INLINE ret_type operator()() const
+	{
+		return (*_stub)(_object);
+	}
+
+	// Use stub pointer as a validity flag and equality checker
+
+	OVR_FORCE_INLINE bool operator==(const this_type &rhs) const
+	{
+		return _object == rhs._object && _stub == rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool operator!=(const this_type &rhs) const
+	{
+		return _object != rhs._object || _stub != rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool IsValid() const
+	{
+		return _stub != 0;
+	}
+
+	OVR_FORCE_INLINE bool operator!() const
+	{
+		return _stub == 0;
+	}
+
+	OVR_FORCE_INLINE void Invalidate()
+	{
+		_stub = 0;
+	}
+
+	// Delegate creation from a function
+
+	template <ret_type (*F)()>
+	static OVR_FORCE_INLINE this_type FromFree()
+	{
+		return this_type(0, &FreeStub<F>);
+	}
+
+	template <class T, ret_type (T::*F)()>
+	static OVR_FORCE_INLINE this_type FromMember(T *object)
+	{
+		return this_type(object, &MemberStub<T, F>);
+	}
+
+	template <class T, ret_type (T::*F)() const>
+	static OVR_FORCE_INLINE this_type FromConstMember(T const *object)
+	{
+		return this_type(const_cast<T*>( object ), &ConstMemberStub<T, F>);
+	}
+
+	// In-place assignment to a different function
+
+	template <ret_type (*F)()>
+	OVR_FORCE_INLINE void SetFree()
+	{
+		*this = FromFree<F>();
+	}
+
+	template <class T, ret_type (T::*F)()>
+	OVR_FORCE_INLINE void SetMember(T *object)
+	{
+		*this = FromMember<T, F>(object);
+	}
+
+	template <class T, ret_type (T::*F)() const>
+	OVR_FORCE_INLINE void SetConstMember(T const *object)
+	{
+		*this = FromConstMember<T, F>(object);
+	}
+};
+
+
+template <class ret_type, class arg1_type>
+class Delegate1
+{
+	typedef ret_type (*StubPointer)(void *, arg1_type);
+	typedef Delegate1<ret_type, arg1_type> this_type;
+
+	void *_object;
+	StubPointer _stub;
+
+	OVR_FORCE_INLINE Delegate1(void *object, StubPointer stub)
+	{
+		_object = object;
+		_stub = stub;
+	}
+
+	// Stubs
+
+	template <ret_type (*F)(arg1_type)>
+	static OVR_FORCE_INLINE ret_type FreeStub(void *object, arg1_type a1)
+	{
+		return (F)(a1);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type)>
+	static OVR_FORCE_INLINE ret_type MemberStub(void *object, arg1_type a1)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)(a1);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type) const>
+	static OVR_FORCE_INLINE ret_type ConstMemberStub(void *object, arg1_type a1)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)(a1);
+	}
+
+public:
+	OVR_FORCE_INLINE Delegate1() {}
+
+	// Function invocation
+
+	OVR_FORCE_INLINE ret_type operator()(arg1_type a1) const
+	{
+		return (*_stub)(_object, a1);
+	}
+
+	// Use stub pointer as a validity flag and equality checker
+
+	OVR_FORCE_INLINE bool operator==(const this_type &rhs) const
+	{
+		return _object == rhs._object && _stub == rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool operator!=(const this_type &rhs) const
+	{
+		return _object != rhs._object || _stub != rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool IsValid() const
+	{
+		return _stub != 0;
+	}
+
+	OVR_FORCE_INLINE bool operator!() const
+	{
+		return _stub == 0;
+	}
+
+	OVR_FORCE_INLINE void Invalidate()
+	{
+		_stub = 0;
+	}
+
+	// Delegate creation from a function
+
+	template <ret_type (*F)(arg1_type)>
+	static OVR_FORCE_INLINE this_type FromFree()
+	{
+		return this_type(0, &FreeStub<F>);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type)>
+	static OVR_FORCE_INLINE this_type FromMember(T *object)
+	{
+		return this_type(object, &MemberStub<T, F>);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type) const>
+	static OVR_FORCE_INLINE this_type FromConstMember(T const *object)
+	{
+		return this_type(const_cast<T*>( object ), &ConstMemberStub<T, F>);
+	}
+
+	// In-place assignment to a different function
+
+	template <ret_type (*F)(arg1_type)>
+	OVR_FORCE_INLINE void SetFree()
+	{
+		*this = FromFree<F>();
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type)>
+	OVR_FORCE_INLINE void SetMember(T *object)
+	{
+		*this = FromMember<T, F>(object);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type) const>
+	OVR_FORCE_INLINE void SetConstMember(T const *object)
+	{
+		*this = FromConstMember<T, F>(object);
+	}
+};
+
+
+template <class ret_type, class arg1_type, class arg2_type>
+class Delegate2
+{
+	typedef ret_type (*StubPointer)(void *, arg1_type, arg2_type);
+	typedef Delegate2<ret_type, arg1_type, arg2_type> this_type;
+
+	void *_object;
+	StubPointer _stub;
+
+	OVR_FORCE_INLINE Delegate2(void *object, StubPointer stub)
+	{
+		_object = object;
+		_stub = stub;
+	}
+
+	// Stubs
+
+	template <ret_type (*F)(arg1_type, arg2_type)>
+	static OVR_FORCE_INLINE ret_type FreeStub(void *object, arg1_type a1, arg2_type a2)
+	{
+		return (F)(a1, a2);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type)>
+	static OVR_FORCE_INLINE ret_type MemberStub(void *object, arg1_type a1, arg2_type a2)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)(a1, a2);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type) const>
+	static OVR_FORCE_INLINE ret_type ConstMemberStub(void *object, arg1_type a1, arg2_type a2)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)(a1, a2);
+	}
+
+public:
+	OVR_FORCE_INLINE Delegate2() {}
+
+	// Function invocation
+
+	OVR_FORCE_INLINE ret_type operator()(arg1_type a1, arg2_type a2) const
+	{
+		return (*_stub)(_object, a1, a2);
+	}
+
+	// Use stub pointer as a validity flag and equality checker
+
+	OVR_FORCE_INLINE bool operator==(const this_type &rhs) const
+	{
+		return _object == rhs._object && _stub == rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool operator!=(const this_type &rhs) const
+	{
+		return _object != rhs._object || _stub != rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool IsValid() const
+	{
+		return _stub != 0;
+	}
+
+	OVR_FORCE_INLINE bool operator!() const
+	{
+		return _stub == 0;
+	}
+
+	OVR_FORCE_INLINE void Invalidate()
+	{
+		_stub = 0;
+	}
+
+	// Delegate creation from a function
+
+	template <ret_type (*F)(arg1_type, arg2_type)>
+	static OVR_FORCE_INLINE this_type FromFree()
+	{
+		return this_type(0, &FreeStub<F>);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type)>
+	static OVR_FORCE_INLINE this_type FromMember(T *object)
+	{
+		return this_type(object, &MemberStub<T, F>);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type) const>
+	static OVR_FORCE_INLINE this_type FromConstMember(T const *object)
+	{
+		return this_type(const_cast<T*>( object ), &ConstMemberStub<T, F>);
+	}
+
+	// In-place assignment to a different function
+
+	template <ret_type (*F)(arg1_type, arg2_type)>
+	OVR_FORCE_INLINE void SetFree()
+	{
+		*this = FromFree<F>();
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type)>
+	OVR_FORCE_INLINE void SetMember(T *object)
+	{
+		*this = FromMember<T, F>(object);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type) const>
+	OVR_FORCE_INLINE void SetConstMember(T const *object)
+	{
+		*this = FromConstMember<T, F>(object);
+	}
+};
+
+
+template <class ret_type, class arg1_type, class arg2_type, class arg3_type>
+class Delegate3
+{
+	typedef ret_type (*StubPointer)(void *, arg1_type, arg2_type, arg3_type);
+	typedef Delegate3<ret_type, arg1_type, arg2_type, arg3_type> this_type;
+
+	void *_object;
+	StubPointer _stub;
+
+	OVR_FORCE_INLINE Delegate3(void *object, StubPointer stub)
+	{
+		_object = object;
+		_stub = stub;
+	}
+
+	// Stubs
+
+	template <ret_type (*F)(arg1_type, arg2_type, arg3_type)>
+	static OVR_FORCE_INLINE ret_type FreeStub(void *object, arg1_type a1, arg2_type a2, arg3_type a3)
+	{
+		return (F)(a1, a2, a3);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type, arg3_type)>
+	static OVR_FORCE_INLINE ret_type MemberStub(void *object, arg1_type a1, arg2_type a2, arg3_type a3)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)(a1, a2, a3);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type, arg3_type) const>
+	static OVR_FORCE_INLINE ret_type ConstMemberStub(void *object, arg1_type a1, arg2_type a2, arg3_type a3)
+	{
+		T *p = static_cast<T*>(object);
+		return (p->*F)(a1, a2, a3);
+	}
+
+public:
+	OVR_FORCE_INLINE Delegate3() {}
+
+	// Function invocation
+
+	OVR_FORCE_INLINE ret_type operator()(arg1_type a1, arg2_type a2, arg3_type a3) const
+	{
+		return (*_stub)(_object, a1, a2, a3);
+	}
+
+	// Use stub pointer as a validity flag and equality checker
+
+	OVR_FORCE_INLINE bool operator==(const this_type &rhs) const
+	{
+		return _object == rhs._object && _stub == rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool operator!=(const this_type &rhs) const
+	{
+		return _object != rhs._object || _stub != rhs._stub;
+	}
+
+	OVR_FORCE_INLINE bool IsValid() const
+	{
+		return _stub != 0;
+	}
+
+	OVR_FORCE_INLINE bool operator!() const
+	{
+		return _stub == 0;
+	}
+
+	OVR_FORCE_INLINE void Invalidate()
+	{
+		_stub = 0;
+	}
+
+	// Delegate creation from a function
+
+	template <ret_type (*F)(arg1_type, arg2_type, arg3_type)>
+	static OVR_FORCE_INLINE this_type FromFree()
+	{
+		return this_type(0, &FreeStub<F>);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type, arg3_type)>
+	static OVR_FORCE_INLINE this_type FromMember(T *object)
+	{
+		return this_type(object, &MemberStub<T, F>);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type, arg3_type) const>
+	static OVR_FORCE_INLINE this_type FromConstMember(T const *object)
+	{
+		return this_type(const_cast<T*>( object ), &ConstMemberStub<T, F>);
+	}
+
+	// In-place assignment to a different function
+
+	template <ret_type (*F)(arg1_type, arg2_type, arg3_type)>
+	OVR_FORCE_INLINE void SetFree()
+	{
+		*this = FromFree<F>();
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type, arg3_type)>
+	OVR_FORCE_INLINE void SetMember(T *object)
+	{
+		*this = FromMember<T, F>(object);
+	}
+
+	template <class T, ret_type (T::*F)(arg1_type, arg2_type, arg3_type) const>
+	OVR_FORCE_INLINE void SetConstMember(T const *object)
+	{
+		*this = FromConstMember<T, F>(object);
+	}
+};
+
+// Add more here if needed, but keep in mind that a short, simple interface
+// is rewarded by making the delegates faster...
+
+
+} // namespace OVR
+
+#endif // OVR_Delegates_h