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std::make_error_code(std::io_errc)

From cppreference.com
< cpp‎ | io‎ | io errc
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.

Contents

[edit] Parameters

e - error code number

[edit] Return value

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

[edit] Example

#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

[edit] 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 noexcept declared noexcept

[edit] See also

holds a platform-dependent error code
(class) [edit]
(C++11)
the IO stream error codes
(enum) [edit]
creates error code value for errc enum e
(function) [edit]
constructs a future error code
(function) [edit]