.. _program_listing_file_eshet_log.hpp:

Program Listing for File log.hpp
================================

|exhale_lsh| :ref:`Return to documentation for file <file_eshet_log.hpp>` (``eshet/log.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   #include <cstdio>
   #include <memory>
   #include <mutex>
   
   namespace eshet {
   
   struct LogCallbacks {
     virtual void debug(const std::string &s) {
       fprintf(stderr, "eshet: %s\n", s.c_str());
     }
     virtual void error(const std::string &s) {
       fprintf(stderr, "eshet: %s\n", s.c_str());
     }
   
     virtual ~LogCallbacks() {}
   };
   
   class Logger {
   public:
     void set_log_callbacks(std::shared_ptr<LogCallbacks> new_log_callbacks) {
       std::lock_guard<std::mutex> guard(callbacks_mut);
   
       log_callbacks = new_log_callbacks;
     }
   
     void debug(const std::string &s) {
       std::lock_guard<std::mutex> guard(callbacks_mut);
       log_callbacks->debug(s);
     }
   
     void error(const std::string &s) {
       std::lock_guard<std::mutex> guard(callbacks_mut);
       log_callbacks->error(s);
     }
   
   private:
     std::mutex callbacks_mut;
     std::shared_ptr<LogCallbacks> log_callbacks =
         std::make_shared<LogCallbacks>();
   };
   
   } // namespace eshet