NAME¶

std::make_error_code(std::io_errc) - std::make_error_code(std::io_errc)

Synopsis¶

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 with an std::io_errc
argument.

Parameters¶

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".

Example¶

// Run this code

#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';
}

Output:¶

Error code from io_errc::stream has category iostream

Defect reports

The following behavior-changing defect reports were applied retroactively to
previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2087 C++11 make_error_code(io_errc) was not declared declared noexcept
noexcept

See also¶

error_code holds a platform-dependent error code
(C++11) (class)
io_errc the IO stream error codes
(C++11) (enum)
make_error_code(std::errc) creates error code value for errc enum e
(C++11) (function)
make_error_code(std::future_errc) constructs a future error code
(C++11) (function)