text: 
  #include <iostream>
  
  #include "logger.hpp"
  
  namespace tcp {
  
  std::unique_ptr<logger_iface> active_logger = nullptr;
  
  static const char black[]  = {0x1b, '[', '1', ';', '3', '0', 'm', 0};
  static const char red[]    = {0x1b, '[', '1', ';', '3', '1', 'm', 0};
  static const char yellow[] = {0x1b, '[', '1', ';', '3', '3', 'm', 0};
  static const char blue[]   = {0x1b, '[', '1', ';', '3', '4', 'm', 0};
  static const char normal[] = {0x1b, '[', '0', ';', '3', '9', 'm', 0};
  
  logger::logger(log_level level)
  : m_level(level) {}
  
  void
  logger::debug(const std::string& msg, const std::string& file, std::size_t line) {
    if (m_level >= log_level::debug) {
      std::lock_guard<std::mutex> lock(m_mutex);
      std::cout << "[" << black << "DEBUG" << normal << "][tcp][" << file << ":" << line << "] " << msg << std::endl;
    }
  }
  
  void
  logger::info(const std::string& msg, const std::string& file, std::size_t line) {
    if (m_level >= log_level::info) {
      std::lock_guard<std::mutex> lock(m_mutex);
      std::cout << "[" << blue << "INFO " << normal << "][tcp][" << file << ":" << line << "] " << msg << std::endl;
    }
  }
  
  void
  logger::warn(const std::string& msg, const std::string& file, std::size_t line) {
    if (m_level >= log_level::warn) {
      std::lock_guard<std::mutex> lock(m_mutex);
      std::cout << "[" << yellow << "WARN " << normal << "][tcp][" << file << ":" << line << "] " << msg << std::endl;
    }
  }
  
  void
  logger::error(const std::string& msg, const std::string& file, std::size_t line) {
    if (m_level >= log_level::error) {
      std::lock_guard<std::mutex> lock(m_mutex);
      std::cerr << "[" << red << "ERROR" << normal << "][tcp][" << file << ":" << line << "] " << msg << std::endl;
    }
  }
  
  void
  debug(const std::string& msg, const std::string& file, std::size_t line) {
    if (active_logger)
      active_logger->debug(msg, file, line);
  }
  
  void
  info(const std::string& msg, const std::string& file, std::size_t line) {
    if (active_logger)
      active_logger->info(msg, file, line);
  }
  
  void
  warn(const std::string& msg, const std::string& file, std::size_t line) {
    if (active_logger)
      active_logger->warn(msg, file, line);
  }
  
  void
  error(const std::string& msg, const std::string& file, std::size_t line) {
    if (active_logger)
      active_logger->error(msg, file, line);
  }
  
  } // namespace tcp
  