Is it possible to convert a boost::system::error_code to a std:error_code?

Question

I want to replace external libraries (like boost) as much as possible with their equivalents in standard C++ if they exist and it is possible, to minimize dependencies, therefor

Answer 1

Since C++-11 (std::errc), boost/system/error_code.hpp maps the same error codes to std::errc, which is defined in the system header system_error.

You can compare both enums and they should be functionally equivalent because they both appear to be based on the POSIX standard. May require a cast.

For example,

namespace posix_error
    {
      enum posix_errno
      {
        success = 0,
        address_family_not_supported = EAFNOSUPPORT,
        address_in_use = EADDRINUSE,
        address_not_available = EADDRNOTAVAIL,
        already_connected = EISCONN,
        argument_list_too_long = E2BIG,
        argument_out_of_domain = EDOM,
        bad_address = EFAULT,
        bad_file_descriptor = EBADF,
        bad_message = EBADMSG,
        ....
       }
     }

and std::errc

address_family_not_supported  error condition corresponding to POSIX code EAFNOSUPPORT  

address_in_use  error condition corresponding to POSIX code EADDRINUSE  

address_not_available  error condition corresponding to POSIX code EADDRNOTAVAIL  

already_connected  error condition corresponding to POSIX code EISCONN  

argument_list_too_long  error condition corresponding to POSIX code E2BIG  

argument_out_of_domain  error condition corresponding to POSIX code EDOM  

bad_address  error condition corresponding to POSIX code EFAULT