std::is_error_code_enum<std::io_errc>

Since C++11

Header: <ios>

This specialization of std::is_error_code_enum informs other library components that values of type std::io_errc are enumerations that hold error codes, which makes them implicitly convertible and assignable to objects of type std::error_code.

# Declarations

template<>
struct is_error_code_enum<std::io_errc> : public std::true_type {};

(since C++11)

# Example

#include <fstream>
#include <iostream>
 
int main()
{
    std::ifstream f("doesn't exist");
    try
    {
        f.exceptions(f.failbit);
    }
    catch (const std::ios_base::failure& e)
    {
        std::cout << "Caught an ios_base::failure.\n";
        if (e.code() == std::io_errc::stream)
            std::cout << "The error code is std::io_errc::stream\n";
    }
}

# See also