add front demo in this project

LFtid1056/cloudfront/code/log4cplus/helpers/loglog.h

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+// -*- C++ -*-
+// Module:  Log4CPLUS
+// File:    loglog.h
+// Created: 6/2001
+// Author:  Tad E. Smith
+//
+//
+// Copyright 2001-2017 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_HELPERS_LOGLOG
+#define LOG4CPLUS_HELPERS_LOGLOG
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <log4cplus/tstring.h>
+#include <log4cplus/streams.h>
+#include <log4cplus/thread/syncprims.h>
+
+
+namespace log4cplus {
+    namespace helpers {
+
+        /**
+         * This class used to output log statements from within the log4cplus package.
+         *
+         * Log4cplus components cannot make log4cplus logging calls. However, it is
+         * sometimes useful for the user to learn about what log4cplus is
+         * doing. You can enable log4cplus internal logging by defining the
+         * <b>log4cplus.configDebug</b> variable.
+         *
+         * All log4cplus internal debug calls go to <code>cout</code>
+         * where as internal error messages are sent to
+         * <code>cerr</code>. All internal messages are prepended with
+         * the string "log4clus: ".
+         */
+        class LOG4CPLUS_EXPORT LogLog
+        {
+        public:
+            //! Return type of getLogLog().
+            typedef LogLog * Ptr;
+
+            /**
+             * Returns a reference to the <code>LogLog</code> singleton.
+             */
+            static Ptr getLogLog();
+
+
+            /**
+             * Allows to enable/disable log4cplus internal logging.
+             */
+            void setInternalDebugging(bool enabled);
+
+            /**
+             * In quite mode no LogLog generates strictly no output, not even
+             * for errors. 
+             *
+             * @param quietMode A true for not
+             */
+            void setQuietMode(bool quietMode);
+
+            /**
+             * This method is used to output log4cplus internal debug
+             * statements. Output goes to <code>std::cout</code>.
+             */
+            void debug(const log4cplus::tstring& msg) const;
+            void debug(tchar const * msg) const;
+
+            /**
+             * This method is used to output log4cplus internal error
+             * statements. There is no way to disable error
+             * statements.  Output goes to
+             * <code>std::cerr</code>. Optionally, this method can
+             * throw std::runtime_error exception too.
+             */
+            void error(const log4cplus::tstring& msg, bool throw_flag = false) const;
+            void error(tchar const * msg, bool throw_flag = false) const;
+
+            /**
+             * This method is used to output log4cplus internal warning
+             * statements. There is no way to disable warning statements.
+             * Output goes to <code>std::cerr</code>.
+             */
+            void warn(const log4cplus::tstring& msg) const;
+            void warn(tchar const * msg) const;
+
+            // Public ctor and dtor to be used only by internal::DefaultContext.
+            LogLog();
+            virtual ~LogLog();
+
+        private:
+            enum TriState
+            {
+                TriUndef = -1,
+                TriFalse,
+                TriTrue
+            };
+
+            template <typename StringType>
+            LOG4CPLUS_PRIVATE
+            void logging_worker (tostream & os,
+                bool (LogLog:: * cond) () const, tchar const *,
+                StringType const &, bool throw_flag = false) const;
+
+            LOG4CPLUS_PRIVATE static void set_tristate_from_env (TriState *,
+                tchar const * envvar);
+
+            LOG4CPLUS_PRIVATE bool get_quiet_mode () const;
+            LOG4CPLUS_PRIVATE bool get_not_quiet_mode () const;
+            LOG4CPLUS_PRIVATE bool get_debug_mode () const;
+
+            // Data
+            mutable TriState debugEnabled;
+            mutable TriState quietMode;
+            thread::Mutex mutex;
+
+            LOG4CPLUS_PRIVATE LogLog(const LogLog&);
+            LOG4CPLUS_PRIVATE LogLog & operator = (LogLog const &);
+        };
+
+        LOG4CPLUS_EXPORT LogLog & getLogLog ();
+
+    } // end namespace helpers
+} // end namespace log4cplus
+
+
+#endif // LOG4CPLUS_HELPERS_LOGLOG
+