private let fromItem: ConstraintItem

    private let toItem: ConstraintItem

    internal init(fromItem: ConstraintItem, toItem: ConstraintItem, relation: ConstraintRelation, constant: Any, multiplier: Float, priority: Float) {

    internal init(fromItem: ConstraintItem, toItem: ConstraintItem, relation: ConstraintRelation, constant: Any, multiplier: Float, priority: Float) {

    func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable

    func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable

    func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable

    init(fromItem: ConstraintItem) {

        self.toItem = ConstraintItem(object: nil, attributes: ConstraintAttributes.None)

    internal func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable {

    internal func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable {

    internal func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable {

    private let fromItem: ConstraintItem

    private var toItem: ConstraintItem {

    private func constrainTo(other: ConstraintItem, relation: ConstraintRelation) -> ConstraintDescription {

        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)

        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)

internal func ==(left: ConstraintItem, right: ConstraintItem) -> Bool {

internal func ==(left: ConstraintItem, right: ConstraintItem) -> Bool {

        let item = ConstraintItem(object: self.view, attributes: attributes)

    public var snp_left: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Left) }

    public var snp_left: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Left) }

    public var snp_top: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Top) }

    public var snp_top: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Top) }

    public var snp_right: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Right) }

    public var snp_right: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Right) }

    public var snp_bottom: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Bottom) }

    public var snp_bottom: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Bottom) }

    public var snp_leading: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Leading) }

    public var snp_leading: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Leading) }

    public var snp_trailing: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Trailing) }

    public var snp_trailing: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Trailing) }

    public var snp_width: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Width) }

    public var snp_width: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Width) }

    public var snp_height: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Height) }

    public var snp_height: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Height) }

    public var snp_centerX: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterX) }

    public var snp_centerX: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterX) }

    public var snp_centerY: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterY) }

    public var snp_centerY: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterY) }

    public var snp_baseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Baseline) }

    public var snp_baseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Baseline) }

    public var snp_firstBaseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.FirstBaseline) }

    public var snp_firstBaseline: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.FirstBaseline) }

    public var snp_leftMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.LeftMargin) }

    public var snp_leftMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.LeftMargin) }

    public var snp_rightMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.RightMargin) }

    public var snp_rightMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.RightMargin) }

    public var snp_topMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.TopMargin) }

    public var snp_topMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.TopMargin) }

    public var snp_bottomMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.BottomMargin) }

    public var snp_bottomMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.BottomMargin) }

    public var snp_leadingMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.LeadingMargin) }

    public var snp_leadingMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.LeadingMargin) }

    public var snp_trailingMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.TrailingMargin) }

    public var snp_trailingMargin: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.TrailingMargin) }

    public var snp_centerXWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterXWithinMargins) }

    public var snp_centerXWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterXWithinMargins) }

    public var snp_centerYWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterYWithinMargins) }

    public var snp_centerYWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterYWithinMargins) }

    public var snp_edges: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Edges) }

    public var snp_edges: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Edges) }

    public var snp_size: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Size) }

    public var snp_size: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Size) }

    public var snp_center: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Center) }

    public var snp_center: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Center) }

    public var snp_margins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Margins) }

    public var snp_margins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.Margins) }

    public var snp_centerWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterWithinMargins) }

    public var snp_centerWithinMargins: ConstraintItem { return ConstraintItem(object: self, attributes: ConstraintAttributes.CenterWithinMargins) }

        self.object = object

        return self.object as? View

        return self.object as? LayoutSupport

    if left.object == nil {

    if right.object == nil {

    if left.object !== right.object {

    if left.object !== right.object {

            if self.fromItem.attributes.isSubsetOf(ConstraintAttributes.Width.union(.Height)) {

        let layoutFromAttributes = self.fromItem.attributes.layoutAttributes

        let layoutToAttributes = self.toItem.attributes.layoutAttributes

            self.fromItem.attributes += attributes

        if other.attributes != ConstraintAttributes.None {

            let toLayoutAttributes = other.attributes.layoutAttributes

                let fromLayoutAttributes = self.fromItem.attributes.layoutAttributes

                other.attributes = ConstraintAttributes.None

        self.attributes = attributes

    if left.attributes != right.attributes {

    if left.attributes != right.attributes {

        if self.toItem.view != nil {

            installOnView = closestCommonSuperviewFromView(self.fromItem.view, toView: self.toItem.view)

            installOnView = closestCommonSuperviewFromView(self.fromItem.view, toView: self.toItem.view)

                installOnView = self.fromItem.view

                installOnView = self.fromItem.view?.superview

        let layoutFrom: View? = self.fromItem.view

            var layoutTo: AnyObject? = self.toItem.view

                    if let fromView = self.fromItem.view {