GeezerVison is showing cplusplus.com — std::system_error::code
classes
enum classes
functions
public member function
<system_error>
const error_code& code() const noexcept;
Get error code
Returns the error_code object associated with the exception.
This value is either the error_code passed to the construction or its equivalent (if constructed with a value and a category).
Return value
The error_code associated with the object.