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  // CLASS CONSTRUCTOR

    /**
     * A joint edge is used to connect bodies and joints together
     * in a joint graph where each body is a node and each joint
     * is an edge. A joint edge belongs to a doubly linked list
     * maintained in each attached body. Each joint has two joint
     * nodes, one for each attached body.
     *
     * @class b2JointEdge
     * @constructor
     * @module  Joints
     */
    function b2JointEdge() {

        /**
         * Other body attached to edge.
         *
         * @public
         * @property     other
         * @type        {b2Body}
         * @default      null
         */
        this.other = null;

        /**
         * The joint.
         *
         * @public
         * @property     joint
         * @type        {b2Joint}
         * @default      null
         */
        this.joint = null;

        /**
         * The previous joint edge in the body's joint list.
         *
         * @public
         * @property     prev
         * @type        {b2JointEdge}
         * @default      null
         */
        this.prev = null;

        /**
         * The next joint edge in the body's joint list.
         *
         * @public
         * @property     next
         * @type        {b2JointEdge}
         * @default      null
         */
        this.next = null;


    } p = b2JointEdge.prototype; Box2D.b2JointEdge = b2JointEdge;