diff -r b70d30e1b0fe -r 8d802b573cf0 src/proto2/Engine.cc
--- a/src/proto2/Engine.cc	Sat Nov 08 20:34:14 2008 +0000
+++ b/src/proto2/Engine.cc	Sat Nov 08 21:25:56 2008 +0000
@@ -69,7 +69,7 @@
 	}
 }
 
-void Engine::log (const std::string &level, const std::string &type, const std::string &message) {
-	std::cout << level << " [" << type << "] " << message << std::endl;
+Logger Engine::log (enum LogLevel level, const char *type) {
+	return Logger(level <= WARN ? std::cerr : std::cout, level, type);
 }