         self.versionStr = version
     }
     
-    func diff(version1: String, version2: String) -> Bool{
-        return false
+    func diff(String, String) -> Int{
+        return 0
     }
     
     public class func valid(version: String) -> Bool{

    }
    
    public func gt(version1: String, version2: String) -> Bool{
        return false
    }
    
    public func lt(version1: String, version2: String) -> Bool{
        return false
    }
    
    public func gte(version1: String, version2: String) -> Bool{
        return false
    }
    
    public func lte(version1: String, version2: String) -> Bool{
        return false
    }
    
    func parse(version: String) -> Semver{

    }
    
    public func valid() -> Bool{
        if let match = versionStr.rangeOfString(SemVerRegexp, options: .RegularExpressionSearch){
            return true
        }
        return false
