text: // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  
  #pragma once
  
  #if defined(_MSC_VER)
  #pragma warning(push)
  #pragma warning(disable:4251)
  #endif
  
  #include <spdlog/details/file_helper.h>
  #include <spdlog/details/null_mutex.h>
  #include <spdlog/sinks/base_sink.h>
  #include <spdlog/details/synchronous_factory.h>
  
  #include <mutex>
  #include <string>
  
  namespace spdlog {
  namespace sinks {
  /*
   * Trivial file sink with single file as target
   */
  template<typename Mutex>
  class basic_file_sink final : public base_sink<Mutex>
  {
  public:
      explicit basic_file_sink(const filename_t &filename, bool truncate = false);
      const filename_t &filename() const;
  
  protected:
      void sink_it_(const details::log_msg &msg) override;
      void flush_() override;
  
  private:
      details::file_helper file_helper_;
  };
  
  using basic_file_sink_mt = basic_file_sink<std::mutex>;
  using basic_file_sink_st = basic_file_sink<details::null_mutex>;
  
  } // namespace sinks
  
  //
  // factory functions
  //
  template<typename Factory = spdlog::synchronous_factory>
  inline std::shared_ptr<logger> basic_logger_mt(const std::string &logger_name, const filename_t &filename, bool truncate = false)
  {
      return Factory::template create<sinks::basic_file_sink_mt>(logger_name, filename, truncate);
  }
  
  template<typename Factory = spdlog::synchronous_factory>
  inline std::shared_ptr<logger> basic_logger_st(const std::string &logger_name, const filename_t &filename, bool truncate = false)
  {
      return Factory::template create<sinks::basic_file_sink_st>(logger_name, filename, truncate);
  }
  
  } // namespace spdlog
  
  #ifdef SPDLOG_HEADER_ONLY
  #include "basic_file_sink-inl.h"
  #endif
  
  #if defined(_MSC_VER)
  #pragma warning(pop)
  #endif
  