Logging.h

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#ifndef CombineTools_Logging_h
#define CombineTools_Logging_h
#include <string>
#include <iostream>
#include <chrono>
 
namespace ch {
 
#define FNERROR(x) ch::FnError(x, __FILE__, __LINE__, __PRETTY_FUNCTION__)
 
#define LOGLINE(x, y) LogLine(x, __func__, y)
 
#define FNLOG(x) x << "[" << __func__ << "] "
#define FNLOGC(x, y) if (y) x << "[" << __func__ << "] "
 
void LogLine(std::ostream& stream, std::string const& func,
             std::string const& message);
 
std::string FnError(std::string const& message, std::string const& file,
                    unsigned line, std::string const& fn);
 
std::string GetQualififedName(std::string const& str);
 
#define LAUNCH_FUNCTION_TIMER(x, y)                             \
  static FnTimer x(ch::GetQualififedName(__PRETTY_FUNCTION__)); \
  auto y = x.Inc();
 
class FnTimer {
 public:
  class Token {
    public:
      explicit Token(FnTimer *src);
      ~Token();
    private:
      FnTimer *src_;
  };
 
  explicit FnTimer(std::string name);
  ~FnTimer();
  Token Inc();
  void StartTimer();
  void StopTimer();
 
 private:
  std::string name_;
  unsigned calls_;
  std::chrono::time_point<std::chrono::system_clock> start_;
  std::chrono::time_point<std::chrono::system_clock> end_;
  double elapsed_;
};
}
 
#endif