Defined in header <ios>
std::error_code make_error_code( std::io_errc e ) noexcept;
(since C++11)

Constructs an std::error_code object from a value of type std::io_errc as if by return std::error_code(static_cast<int>(e), std::iostream_category()). This function is called by the constructor of std::error_code when given an std::io_errc argument.


e - error code number

Return value

A value of type std::error_code that holds the error code number from e associated with the error category "iostream".


#include <iostream>
#include <system_error>
int main()
    std::error_code ec = std::make_error_code(std::io_errc::stream);
    // This works because of the overloaded method
    //    and the is_error_code_enum specialization.
    ec = std::io_errc::stream;
    std::cout << "Error code from io_errc::stream has category "
              << ec.category().name() << '\n';


Error code from io_errc::stream has category iostream

See also

holds a platform-dependent error code
the IO stream error codes
constructs an std::errc error code
constructs a future error code

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