////  ObjectConstraint.h//  libraries/physcis/src////  Created by Seth Alves 2017-4-11//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html////  http://bulletphysics.org/Bullet/BulletFull/classbtConstraintInterface.html #ifndef hifi_ObjectConstraint_h#define hifi_ObjectConstraint_h #include <QUuid>#include <btBulletDynamicsCommon.h>#include "ObjectDynamic.h" class ObjectConstraint : public ObjectDynamic{public:    ObjectConstraint(EntityDynamicType type, const QUuid& id, EntityItemPointer ownerEntity);    virtual ~ObjectConstraint() {}     virtual btTypedConstraint* getConstraint() = 0;     virtual bool isConstraint() const override { return true; }    virtual void invalidate() override; protected:    btTypedConstraint* _constraint { nullptr };}; #endif // hifi_ObjectConstraint_h