Logger.h

#ifndef LINEARALGEBRA_SRC_MOLPRO_LINALG_ITSOLV_LOGGER_H
#define LINEARALGEBRA_SRC_MOLPRO_LINALG_ITSOLV_LOGGER_H
#include <bitset>
#include <iomanip>
#include <iterator>
#include <numeric>
#include <ostream>
#include <sstream>
#include <string>
 
namespace molpro::linalg::itsolv {
 
struct Logger {
  enum Level : short { None, Trace, Debug, Info, Warn, Error, Fatal };
 
  void msg(const std::string& message, Level log_lvl);
 
  template <typename ForwardIt>
  void msg(const std::string& message, ForwardIt begin, ForwardIt end, Level log_lvl, int precision = 3) {
    std::ostringstream os{};
    os << message;
    if (!std::is_integral_v<decltype(*begin)>) {
      os << std::setprecision(precision);
    }
    std::copy(begin, end, std::ostream_iterator<decltype(*begin)>(os, ", "));
    msg(os.str(), log_lvl);
  }
 
  static std::string scientific(double val);
 
  Level max_trace_level = None; 
  Level max_warn_level = None;  
  bool data_dump = false;       
};
 
} // namespace molpro::linalg::itsolv
 
#endif // LINEARALGEBRA_SRC_MOLPRO_LINALG_ITSOLV_LOGGER_H