kdar/factorlog — pull request #4 by jmunson (2014-09-29 18:21:54+00:00)
Title: Added verbosity methods to Logger interface, made NullLogger implement them

Added log verbosity methods (V, SetVerbosity, and IsV) to factorlog.Logger interface

Added those functions to factorlog.NullLogger

This allows you to accept a Logger and pass it either a FactorLog or NullLogger object.