text: // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  
  #pragma once
  
  #include <spdlog/tweakme.h>
  #include <spdlog/details/null_mutex.h>
  
  #include <atomic>
  #include <chrono>
  #include <initializer_list>
  #include <memory>
  #include <exception>
  #include <string>
  #include <type_traits>
  #include <functional>
  
  #ifdef SPDLOG_COMPILED_LIB
  #undef SPDLOG_HEADER_ONLY
  #if defined(_WIN32) && defined(SPDLOG_SHARED_LIB)
  #ifdef spdlog_EXPORTS
  #define SPDLOG_API __declspec(dllexport)
  #else
  #define SPDLOG_API __declspec(dllimport)
  #endif
  #else // !defined(_WIN32) || !defined(SPDLOG_SHARED_LIB)
  #define SPDLOG_API
  #endif
  #define SPDLOG_INLINE
  #else // !defined(SPDLOG_COMPILED_LIB)
  #define SPDLOG_API
  #define SPDLOG_HEADER_ONLY
  #define SPDLOG_INLINE inline
  #endif // #ifdef SPDLOG_COMPILED_LIB
  
  #include <spdlog/fmt/fmt.h>
  
  // visual studio upto 2013 does not support noexcept nor constexpr
  #if defined(_MSC_VER) && (_MSC_VER < 1900)
  #define SPDLOG_NOEXCEPT _NOEXCEPT
  #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
  
  // disable thread local on msvc 2013
  #ifndef SPDLOG_NO_TLS
  #if (defined(_MSC_VER) && (_MSC_VER < 1900)) || defined(__cplusplus_winrt)
  #define SPDLOG_NO_TLS 1
  #endif
  #endif
  
  #ifndef SPDLOG_FUNCTION
  #define SPDLOG_FUNCTION static_cast<const char *>(__FUNCTION__)
  #endif
  
  #ifdef SPDLOG_NO_EXCEPTIONS
  #define SPDLOG_TRY
  #define SPDLOG_THROW(ex)                                                                                                                   \
      do                                                                                                                                     \
      {                                                                                                                                      \
          printf("spdlog fatal error: %s\n", ex.what());                                                                                     \
          std::abort();                                                                                                                      \
      } while (0)
  #define SPDLOG_CATCH_ALL()
  #else
  #define SPDLOG_TRY try
  #define SPDLOG_THROW(ex) throw(ex)
  #define SPDLOG_CATCH_ALL() catch (...)
  #endif
  
  namespace spdlog {
  
  class formatter;
  
  namespace sinks {
  class sink;
  }
  
  #if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
  using filename_t = std::wstring;
  // allow macro expansion to occur in SPDLOG_FILENAME_T
  #define SPDLOG_FILENAME_T_INNER(s) L##s
  #define SPDLOG_FILENAME_T(s) SPDLOG_FILENAME_T_INNER(s)
  #else
  using filename_t = std::string;
  #define SPDLOG_FILENAME_T(s) s
  #endif
  
  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 err_handler = std::function<void(const std::string &err_msg)>;
  using string_view_t = fmt::basic_string_view<char>;
  using wstring_view_t = fmt::basic_string_view<wchar_t>;
  using memory_buf_t = fmt::basic_memory_buffer<char, 250>;
  using wmemory_buf_t = fmt::basic_memory_buffer<wchar_t, 250>;
  
  #ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
  #ifndef _WIN32
  #error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
  #else
  template<typename T>
  struct is_convertible_to_wstring_view : std::is_convertible<T, wstring_view_t>
  {};
  #endif // _WIN32
  #else
  template<typename>
  struct is_convertible_to_wstring_view : std::false_type
  {};
  #endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
  
  #if defined(SPDLOG_NO_ATOMIC_LEVELS)
  using level_t = details::null_atomic_int;
  #else
  using level_t = std::atomic<int>;
  #endif
  
  #define SPDLOG_LEVEL_TRACE 0
  #define SPDLOG_LEVEL_DEBUG 1
  #define SPDLOG_LEVEL_INFO 2
  #define SPDLOG_LEVEL_WARN 3
  #define SPDLOG_LEVEL_ERROR 4
  #define SPDLOG_LEVEL_CRITICAL 5
  #define SPDLOG_LEVEL_OFF 6
  
  #if !defined(SPDLOG_ACTIVE_LEVEL)
  #define SPDLOG_ACTIVE_LEVEL SPDLOG_LEVEL_INFO
  #endif
  
  // Log level enum
  namespace level {
  enum level_enum
  {
      trace = SPDLOG_LEVEL_TRACE,
      debug = SPDLOG_LEVEL_DEBUG,
      info = SPDLOG_LEVEL_INFO,
      warn = SPDLOG_LEVEL_WARN,
      err = SPDLOG_LEVEL_ERROR,
      critical = SPDLOG_LEVEL_CRITICAL,
      off = SPDLOG_LEVEL_OFF,
      n_levels
  };
  
  #if !defined(SPDLOG_LEVEL_NAMES)
  #define SPDLOG_LEVEL_NAMES                                                                                                                 \
      {                                                                                                                                      \
          "trace", "debug", "info", "warning", "error", "critical", "off"                                                                    \
      }
  #endif
  
  #if !defined(SPDLOG_SHORT_LEVEL_NAMES)
  
  #define SPDLOG_SHORT_LEVEL_NAMES                                                                                                           \
      {                                                                                                                                      \
          "T", "D", "I", "W", "E", "C", "O"                                                                                                  \
      }
  #endif
  
  SPDLOG_API string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
  SPDLOG_API const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
  SPDLOG_API spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT;
  
  } // namespace level
  
  //
  // Color mode used by sinks with color support.
  //
  enum class color_mode
  {
      always,
      automatic,
      never
  };
  
  //
  // 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_API spdlog_ex : public std::exception
  {
  public:
      explicit spdlog_ex(std::string msg);
      spdlog_ex(const std::string &msg, int last_errno);
      const char *what() const SPDLOG_NOEXCEPT override;
  
  private:
      std::string msg_;
  };
  
  SPDLOG_API void throw_spdlog_ex(const std::string &msg, int last_errno);
  SPDLOG_API void throw_spdlog_ex(std::string msg);
  
  struct source_loc
  {
      SPDLOG_CONSTEXPR source_loc() = default;
      SPDLOG_CONSTEXPR source_loc(const char *filename_in, int line_in, const char *funcname_in)
          : filename{filename_in}
          , line{line_in}
          , funcname{funcname_in}
      {}
  
      SPDLOG_CONSTEXPR bool empty() const SPDLOG_NOEXCEPT
      {
          return line == 0;
      }
      const char *filename{nullptr};
      int line{0};
      const char *funcname{nullptr};
  };
  
  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
  
  #ifdef SPDLOG_HEADER_ONLY
  #include "common-inl.h"
  #endif
  