C++ IOS Library - Errc

Description

This enum class type defines the error conditions of the iostream category. The enum includes at least the following label as shown −

All library implementations define at least this value (stream, with a value of 1), but may provide additional values, especially if they require to produce additional error codes for the iostream category.

Values of the enum type io_errc may be used to create error_condition objects to be compared against the value returned by the code member of ios_base::failure.

Declaration

Following is the declaration for std::io_errc function.

enum class io_errc;;

Parameters

none

Example

In below example explains about std::io_errc function.

#include 

int main () {
   std::cin.exceptions (std::ios::failbit|std::ios::badbit);
   try {
      std::cin.rdbuf(nullptr);
   } catch (std::ios::failure& e) {
      std::cerr << "failure caught: ";
      if ( e.code() == std::make_error_condition(std::io_errc::stream) )
         std::cerr << "stream error condition\n";
      else
         std::cerr << "some other error condition\n";
   }
   return 0;
}

Let us compile and run the above program, this will produce the following result −

failure caught: stream error condition