diff --git a/Demo/Classes/Presentation/Controllers/MainController.swift b/Demo/Classes/Presentation/Controllers/MainController.swift
index bec8ab6..91b855d 100644
--- a/Demo/Classes/Presentation/Controllers/MainController.swift
+++ b/Demo/Classes/Presentation/Controllers/MainController.swift
@@ -35,9 +35,7 @@ class MainController: UIViewController {
         let row1 = TableRow<String, StoryboardImageTableViewCell>(item: "1")
         let row2 = TableRow<String, StoryboardImageTableViewCell>(item: "2")
         let row3 = TableRow<String, StoryboardImageTableViewCell>(item: "3", actions: [a])
-       
-        
-        
+
         row1
             .addAction(TableRowAction(.shouldHighlight) { (data) -> Bool in
 
diff --git a/Sources/HeightStrategy.swift b/Sources/HeightStrategy.swift
index 9072767..72eef2e 100644
--- a/Sources/HeightStrategy.swift
+++ b/Sources/HeightStrategy.swift
@@ -27,7 +27,7 @@ public protocol HeightCalculatingStrategy {
     func height(indexPath: NSIndexPath, reusableIdentifier: String, configure: (cell: UITableViewCell) -> Void) -> CGFloat
 }
 
-public class PrototypeHeightStrategy {
+public class PrototypeHeightStrategy: HeightCalculatingStrategy {
 
     public weak var tableView: UITableView?
     private var cachedHeights = [Int: CGFloat]()
diff --git a/Sources/TableRow.swift b/Sources/TableRow.swift
index 62fd90b..e4b3fbb 100644
--- a/Sources/TableRow.swift
+++ b/Sources/TableRow.swift
@@ -31,7 +31,12 @@ public protocol RowActionable {
     func hasAction(action: TableRowActionType) -> Bool
 }
 
-public protocol Row: RowConfigurable, RowActionable {
+public protocol RowHashable {
+    
+    var hashValue: Int { get }
+}
+
+public protocol Row: RowConfigurable, RowActionable, RowHashable {
 
     var reusableIdentifier: String { get }
     var estimatedHeight: CGFloat { get }
@@ -42,6 +47,10 @@ public class TableRow<ItemType, CellType: ConfigurableCell where CellType.T == I
 
     public let item: ItemType
     private lazy var actions = [String: TableRowAction<ItemType, CellType>]()
+    
+    public var hashValue: Int {
+        return ObjectIdentifier(self).hashValue
+    }
 
     public var reusableIdentifier: String {
         return CellType.reusableIdentifier()