Added logging.hpp.
diff --git a/ndn-cpp/util/logging.hpp b/ndn-cpp/util/logging.hpp
new file mode 100644
index 0000000..84ad405
--- /dev/null
+++ b/ndn-cpp/util/logging.hpp
@@ -0,0 +1,79 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * @author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ * @author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_LOGGING_HPP
+#define NDN_LOGGING_HPP
+
+#include "../../config.h"
+
+#ifdef HAVE_LOG4CXX
+
+#include <log4cxx/logger.h>
+
+#define MEMBER_LOGGER \
+ static log4cxx::LoggerPtr staticModuleLogger;
+
+#define INIT_MEMBER_LOGGER(className,name) \
+ log4cxx::LoggerPtr className::staticModuleLogger = log4cxx::Logger::getLogger (name);
+
+#define INIT_LOGGER(name) \
+ static log4cxx::LoggerPtr staticModuleLogger = log4cxx::Logger::getLogger (name);
+
+#define _LOG_DEBUG(x) \
+ LOG4CXX_DEBUG(staticModuleLogger, x);
+
+#define _LOG_TRACE(x) \
+ LOG4CXX_TRACE(staticModuleLogger, x);
+
+#define _LOG_FUNCTION(x) \
+ LOG4CXX_TRACE(staticModuleLogger, __FUNCTION__ << "(" << x << ")");
+
+#define _LOG_FUNCTION_NOARGS \
+ LOG4CXX_TRACE(staticModuleLogger, __FUNCTION__ << "()");
+
+#define _LOG_ERROR(x) \
+ LOG4CXX_ERROR(staticModuleLogger, x);
+
+#define _LOG_ERROR_COND(cond,x) \
+ if (cond) { _LOG_ERROR(x) }
+
+#define _LOG_DEBUG_COND(cond,x) \
+ if (cond) { _LOG_DEBUG(x) }
+
+void
+INIT_LOGGERS ();
+
+#else // else HAVE_LOG4CXX
+
+#define INIT_LOGGER(name)
+#define _LOG_FUNCTION(x)
+#define _LOG_FUNCTION_NOARGS
+#define _LOG_TRACE(x)
+#define INIT_LOGGERS(x)
+#define _LOG_ERROR(x)
+#define _LOG_ERROR_COND(cond,x)
+#define _LOG_DEBUG_COND(cond,x)
+
+#define MEMBER_LOGGER
+#define INIT_MEMBER_LOGGER(className,name)
+
+#ifdef _DEBUG
+
+#include <sys/time.h>
+#include <iostream>
+
+#define _LOG_DEBUG(x) \
+ { time_t now = time(0); std::string s = std::string(ctime(&now)); std::clog << s.substr(0, s.size() - 1) << " " << x << std::endl; }
+
+#else
+#define _LOG_DEBUG(x)
+#endif
+
+#endif // HAVE_LOG4CXX
+
+#endif