std::future_errc

enum class future_errc {
    broken_promise             = /* implementation-defined */,
    future_already_retrieved   = /* implementation-defined */,
    promise_already_satisfied  = /* implementation-defined */,
    no_state                   = /* implementation-defined */
};

The scoped enumeration std::future_errc defines the error codes reported by std::future and related classes in std::future_error exception objects. Only four error codes are required, although the implementation may define additional error codes. Because the appropriate specialization of std::is_error_code_enum is provided, values of type std::future_errc are implicitly convertible to std::error_code.

All error codes are distinct and non-zero.

Member constants

Non-member functions

Helper classes

Example

Defect reports

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

See also