Class Format

10.16-logFunction2/main.cpp:11–22

enum LogLevel { Info, Warning, Error };

struct Format {
  std::string_view     fmt;
  std::source_location loc;

  // #A Constructor allowing implicit conversion
  Format(
    const char*          _fmt,
    std::source_location _loc = std::source_location::current())
  : fmt{_fmt}
  , loc{_loc}
  {}
};

// #B Log now takes Format which implicitly adds source location
// information