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#ifndef LOGGER_INCLUDED
# define LOGGER_INCLUDED
/**
* Singleton used in logger macros to write into files or stdout, with
* various levels of severity.
* Only the macros should be used.
* @class Logger
*/
#include <memory>
#include <iostream>
#include <fstream>
#define debug_lvl 0
#define info_lvl 1
#define warning_lvl 2
#define error_lvl 3
// Macro defined to get the filename instead of the full path. But if it is
// not properly defined by the build system, we fallback to __FILE__
#ifndef __FILENAME__
# define __FILENAME__ __FILE__
#endif
#define WHERE\
__FILENAME__ << ":" << __LINE__
#define log_debug(text)\
Logger::instance()->get_stream(debug_lvl) << "[DEBUG]:" << WHERE << ":\t" << text << std::endl;
#define log_info(text)\
Logger::instance()->get_stream(info_lvl) << "[INFO]:" << WHERE << ":\t" << text << std::endl;
#define log_warning(text)\
Logger::instance()->get_stream(warning_lvl) << "[WARNING]:" << WHERE << ":\t" << text << std::endl;
#define log_error(text)\
Logger::instance()->get_stream(error_lvl) << "[ERROR]:" << WHERE << ":\t" << text << std::endl;
/**
* Juste a structure representing a stream doing nothing with its input.
*/
class nullstream: public std::ostream
{
public:
nullstream():
std::ostream(0)
{ }
};
class Logger
{
public:
static std::unique_ptr<Logger>& instance();
std::ostream& get_stream(const int);
Logger(const int log_level, const std::string& log_file);
Logger(const int log_level);
private:
Logger(const Logger&);
Logger& operator=(const Logger&);
const int log_level;
std::ofstream ofstream;
nullstream null_stream;
std::ostream stream;
};
#endif // LOGGER_INCLUDED
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