add front demo in this project

LFtid1056/cloudfront/code/log4cplus/tracelogger.h

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+// -*- C++ -*-
+// Module:  Log4CPLUS
+// File:    tracelogger.h
+// Created: 1/2009
+// Author:  Vaclav Haisman
+//
+//
+// Copyright 2009-2017 Tad E. Smith
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/** @file */
+
+#ifndef LOG4CPLUS_TRACELOGGER_H
+#define LOG4CPLUS_TRACELOGGER_H
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <log4cplus/logger.h>
+
+
+namespace log4cplus
+{
+
+
+/**
+ * This class is used to produce "Trace" logging.  When an instance of
+ * this class is created, it will log a <code>"ENTER: " + msg</code>
+ * log message if TRACE_LOG_LEVEL is enabled for <code>logger</code>.
+ * When an instance of this class is destroyed, it will log a
+ * <code>"ENTER: " + msg</code> log message if TRACE_LOG_LEVEL is enabled
+ * for <code>logger</code>.
+ * <p>
+ * @see LOG4CPLUS_TRACE
+ */
+class TraceLogger
+{
+public:
+    TraceLogger(Logger l, log4cplus::tstring _msg,
+        const char* _file = LOG4CPLUS_CALLER_FILE (),
+        int _line = LOG4CPLUS_CALLER_LINE (),
+        char const * _function = LOG4CPLUS_CALLER_FUNCTION ())
+        : logger(std::move (l)), msg(std::move (_msg)), file(_file),
+          function(_function), line(_line)
+    {
+        if(logger.isEnabledFor(TRACE_LOG_LEVEL))
+            logger.forcedLog(TRACE_LOG_LEVEL, LOG4CPLUS_TEXT("ENTER: ") + msg,
+                file, line, function);
+    }
+
+    ~TraceLogger()
+    {
+        if(logger.isEnabledFor(TRACE_LOG_LEVEL))
+            logger.forcedLog(TRACE_LOG_LEVEL, LOG4CPLUS_TEXT("EXIT:  ") + msg,
+                file, line, function);
+    }
+
+private:
+    TraceLogger (TraceLogger const &);
+    TraceLogger & operator = (TraceLogger const &);
+
+    Logger logger;
+    log4cplus::tstring msg;
+    const char* file;
+    const char* function;
+    int line;
+};
+
+
+} // log4cplus
+
+
+#endif // LOG4CPLUS_TRACELOGGER_H