logger.hpp

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/*
 * logger.hpp
 *
 * Created on: 20 Sep 2012
 * Author: Holger Schmitz
 * Email: holger@notjustphysics.com
 *
 * Copyright 2012 Holger Schmitz
 *
 * This file is part of Schnek.
 *
 * Schnek is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Schnek is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Schnek.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef SCHNEK_LOGGER_HPP_
#define SCHNEK_LOGGER_HPP_


#include <boost/preprocessor/control/iif.hpp>
#include <boost/preprocessor/facilities/empty.hpp>
#include <boost/preprocessor/comparison/greater_equal.hpp>

#include <iostream>
#include <string>

#include "singleton.hpp"

namespace schnek {

#define SCHNEK_TRACE_LOG(i,x)                         \
  BOOST_PP_IIF( BOOST_PP_GREATER_EQUAL( LOGLEVEL, i ), \
    schnek::Logger::instance().out() << __LINE__ << " " << __FILE__ << ": "<< x << "\n";, \
    BOOST_PP_EMPTY()                                   \
  )

#define SCHNEK_TRACE_ERR(i,x)                                  \
  BOOST_PP_IIF( BOOST_PP_GREATER_EQUAL( LOGLEVEL, i ), \
      schnek::Logger::instance().err() << __LINE__ << " " << __FILE__ << ": " << x << "\n";, \
    BOOST_PP_EMPTY()                                   \
  )

#define SCHNEK_TRACE_ENTER_FUNCTION(i)                                  \
  BOOST_PP_IIF( BOOST_PP_GREATER_EQUAL( LOGLEVEL, i ), \
    schnek::Logger::instance().out() << "Entering " << BOOST_CURRENT_FUNCTION << std::endl;, \
    BOOST_PP_EMPTY()                                   \
  )

#define SCHNEK_TRACE_EXIT_FUNCTION(i)                                  \
  BOOST_PP_IIF( BOOST_PP_GREATER_EQUAL( LOGLEVEL, i ), \
    schnek::Logger::instance().out() << "Leaving " << BOOST_CURRENT_FUNCTION << std::endl;, \
    BOOST_PP_EMPTY()                                   \
  )

#ifndef LOGLEVEL
#define LOGLEVEL 0
#endif

#include "singleton.hpp"

class Logger : public Singleton<Logger>
{
  public:
    std::ostream &out() { return std::cout; }

    std::ostream &err() { return std::cerr; }
  private:
    friend class Singleton<Logger>;
    friend class CreateUsingNew<Logger>;

    Logger() { }

    ~Logger() {
//      std::cerr << "DELETING LOGGER "<< this <<" " <<i<<"\n";
    }
};

} // namespace 
#endif // LOGGER_HPP_