     
     - returns: The string logged out.
     */
-    public func warning(format: String, function: String = __FUNCTION__, file: String = __FILE__, line: Int = __LINE__, args: CVarArgType...) -> String?
+    public func warning(format: String = "", function: String = __FUNCTION__, file: String = __FILE__, line: Int = __LINE__, args: CVarArgType...) -> String?
     {
         if .Warning >= logLevel {
             return log(.Warning, function: function, file: file, line: line, format: format, args: args)

    
    - returns: The string logged out.
    */
    public func error(format: String, function: String = __FUNCTION__, file: String = __FILE__, line: Int = __LINE__, args: CVarArgType...) -> String?
    {
        if .Error >= logLevel {
            return log(.Error, function: function, file: file, line: line, format: format, args: args)

    
    - returns: The string logged out.
    */
    public func verbose(format: String = "", function: String = __FUNCTION__, file: String = __FILE__, line: Int = __LINE__, args: CVarArgType...) -> String? {
        if .Verbose >= logLevel {
            return log(.Verbose, function: function, file: file,  line: line, format: format, args: args)
        }
