.. _program_listing_file_EventLoop_Utility.cpp:

Program Listing for File Utility.cpp
====================================

|exhale_lsh| :ref:`Return to documentation for file <file_EventLoop_Utility.cpp>` (``EventLoop/Utility.cpp``)

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

.. code-block:: cpp

   #include "netio3-backend/EventLoop/Utility.hpp"
   
   #include <array>
   #include <cstddef>
   #include <cstring>
   
   std::string netio3::utility::error_message(int error)
   {
     constexpr static auto BUFFER_SIZE = std::size_t{256};
     std::array<char, BUFFER_SIZE> buffer{};
     if constexpr (requires(int err, char* buf, size_t buflen) {
                     {
                       strerror_r(err, buf, buflen)
                     } -> std::convertible_to<char*>;
                   }) {
       // GNU-specific version
       char* message = strerror_r(error, buffer.data(), buffer.size());
       if (message != nullptr) {
         return {message};
       }
     } else if constexpr (requires(int err, char* buf, size_t buflen) {
                            {
                              strerror_r(err, buf, buflen)
                            } -> std::convertible_to<int>;
                          }) {
       // POSIX-compliant version
       if (strerror_r(error, buffer.data(), buffer.size()) == nullptr) {
         return {buffer.data()};
       }
     }
     return "Unknown error";
   }