logging.hpp

#ifndef LOGGING_H
#define LOGGING_H
 
#ifdef ENABLE_LOGGING
 
#include <string>
 
 
// Levels as Numbers (in order of increasing severity)
#define INFO 0
#define WARN 1
#define ERROR 2
 
// Levels as Strings (in order of increasing severity)
#define INFO_STR "INFO"
#define WARN_STR "WARN"
#define ERROR_STR "ERROR"
 
#define GET_LEVEL(level) \
    (level == ERROR ? ERROR_STR : (level == WARN ? WARN_STR : INFO_STR))
 
 
// LOG_INFO, LOG_WARN and LOG_ERROR
// should be used within the program
// (see command-line/parser.cpp for examples)
 
// Basically, the logging level only allows logs equal
// to its level and above (in severity) to be printed
#if LOGGING_LEVEL == INFO
    #define LOG_INFO(msg) found::Log(INFO, msg)
    #define LOG_WARN(msg) found::Log(WARN, msg)
    #define LOG_ERROR(msg) found::Log(ERROR, msg)
#elif LOGGING_LEVEL == WARN
    #define LOG_INFO(msg)
    #define LOG_WARN(msg) found::Log(WARN, msg)
    #define LOG_ERROR(msg) found::Log(ERROR, msg)
#else
    #define LOG_INFO(msg)
    #define LOG_WARN(msg)
    #define LOG_ERROR(msg) found::Log(ERROR, msg)
#endif
 
namespace found {
 
 
// The output streams to where the logs go. You must
// place your definitions of each within each ifndef
// statement
#ifndef INFO_STREAM
#define INFO_STREAM std::cout
#endif
#ifndef WARN_STREAM
#define WARN_STREAM std::cerr
#endif
#ifndef ERROR_STREAM
#define ERROR_STREAM std::cerr
#endif
 
#define GET_STREAM(level) \
    (level == ERROR ? ERROR_STREAM : (level == WARN ? WARN_STREAM : INFO_STREAM))
 
void Log(int level, const std::string message);
 
}  // namespace found
 
#else
 
#define LOG_INFO(msg)
#define LOG_WARN(msg)
#define LOG_ERROR(msg)
 
#endif
 
#endif  // LOGGING_H