std::error_code::error_code (3) Linux Manual Page

std::error_code::error_code – std::error_code::error_code

Synopsis

error_code() noexcept;
(1)(since C++ 11)

    error_code(int ec, const error_category &ecat) noexcept;
(2)(since C++ 11)

    template <class ErrorCodeEnum>
    (3)(since C++ 11)

        error_code(ErrorCodeEnum e) noexcept;

Constructs new error code.
1) Constructs error code with default value. Equivalent to error_code(0, std::system_category()).
2) Constructs error code with ec as the platform-dependent error code and ecat as the corresponding error category.
3) Constructs error code from an error code enum e. Equivalent to *this = make_error_code(e). The overload participates in overload resolutions only if std::is_error_code_enum<ErrorCodeEnum>::value == true.

Parameters

ec – platform dependent error code to construct with
ecat – error category corresponding to ec
e – error code enum to construct with

See also

make_error_code(std::errc) constructs an std::errc error code
                                  (function)
(C++11)
make_error_code(std::io_errc) constructs an iostream error code
                                  (function)
(C++11)
make_error_code(std::future_errc) constructs a future error code
                                  (function)
(C++11)