text: //
  // Copyright(c) 2015 Gabi Melman.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  //
  
  #pragma once
  
  #include "spdlog/tweakme.h"
  
  #include <atomic>
  #include <chrono>
  #include <functional>
  #include <initializer_list>
  #include <memory>
  #include <stdexcept>
  #include <string>
  #include <type_traits>
  #include <unordered_map>
  
  #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
  #include <codecvt>
  #include <locale>
  #endif
  
  #include "spdlog/details/null_mutex.h"
  
  // visual studio upto 2013 does not support noexcept nor constexpr
  #if defined(_MSC_VER) && (_MSC_VER < 1900)
  #define SPDLOG_NOEXCEPT throw()
  #define SPDLOG_CONSTEXPR
  #else
  #define SPDLOG_NOEXCEPT noexcept
  #define SPDLOG_CONSTEXPR constexpr
  #endif
  
  #if defined(__GNUC__) || defined(__clang__)
  #define SPDLOG_DEPRECATED __attribute__((deprecated))
  #elif defined(_MSC_VER)
  #define SPDLOG_DEPRECATED __declspec(deprecated)
  #else
  #define SPDLOG_DEPRECATED
  #endif
  
  #include "spdlog/fmt/fmt.h"
  
  namespace spdlog {
  
  class formatter;
  
  namespace sinks {
  class sink;
  }
  
  using log_clock = std::chrono::system_clock;
  using sink_ptr = std::shared_ptr<sinks::sink>;
  using sinks_init_list = std::initializer_list<sink_ptr>;
  using log_err_handler = std::function<void(const std::string &err_msg)>;
  
  #if defined(SPDLOG_NO_ATOMIC_LEVELS)
  using level_t = details::null_atomic_int;
  #else
  using level_t = std::atomic<int>;
  #endif
  
  // Log level enum
  namespace level {
  enum level_enum {
    trace = 0,
    debug = 1,
    info = 2,
    warn = 3,
    err = 4,
    critical = 5,
    off = 6
  };
  
  #if !defined(SPDLOG_LEVEL_NAMES)
  #define SPDLOG_LEVEL_NAMES                                                                                                                 \
      {                                                                                                                                      \
          "trace", "debug", "info", "warning", "error", "critical", "off"                                                                    \
      }
  #endif
  static const char *level_names[]SPDLOG_LEVEL_NAMES;
  
  static const char *short_level_names[]{"T", "D", "I", "W", "E", "C", "O"};
  
  inline const char *to_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT {
      return level_names[l];
  }
  
  inline const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT {
      return short_level_names[l];
  }
  
  inline spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT {
      static std::unordered_map<std::string, level_enum> name_to_level = // map string->level
          {{level_names[0], level::trace},                               // trace
           {level_names[1], level::debug},                            // debug
           {level_names[2], level::info},                             // info
           {level_names[3], level::warn},                             // warn
           {level_names[4], level::err},                              // err
           {level_names[5], level::critical},                         // critical
           {level_names[6], level::off}};                             // off
  
      auto lvl_it = name_to_level.find(name);
      return lvl_it != name_to_level.end() ? lvl_it->second : level::off;
  }
  
  using level_hasher = std::hash<int>;
  } // namespace level
  
  //
  // Pattern time - specific time getting to use for pattern_formatter.
  // local time by default
  //
  enum class pattern_time_type {
    local, // log localtime
    utc    // log utc
  };
  
  //
  // Log exception
  //
  class spdlog_ex : public std::exception {
   public:
    explicit spdlog_ex(std::string msg)
        : msg_(std::move(msg)) {
    }
  
    spdlog_ex(const std::string &msg, int last_errno) {
        fmt::memory_buffer outbuf;
        fmt::format_system_error(outbuf, last_errno, msg);
        msg_ = fmt::to_string(outbuf);
    }
  
    const char *what() const SPDLOG_NOEXCEPT override {
        return msg_.c_str();
    }
  
   private:
    std::string msg_;
  };
  
  //
  // wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
  //
  #if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
  using filename_t = std::wstring;
  #else
  using filename_t = std::string;
  #endif
  
  #define SPDLOG_CATCH_AND_HANDLE                                                                                                            \
      catch (const std::exception &ex)                                                                                                       \
      {                                                                                                                                      \
          err_handler_(ex.what());                                                                                                           \
      }                                                                                                                                      \
      catch (...)                                                                                                                            \
      {                                                                                                                                      \
          err_handler_("Unknown exeption in logger");                                                                                        \
      }
  
  namespace details {
  // make_unique support for pre c++14
  
  #if __cplusplus >= 201402L // C++14 and beyond
  using std::make_unique;
  #else
  template<typename T, typename... Args>
  std::unique_ptr<T> make_unique(Args &&... args) {
      static_assert(!std::is_array<T>::value, "arrays not supported");
      return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
  }
  #endif
  } // namespace details
  } // namespace spdlog
  