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.
[edit] Member constants Enumerator Meaningbroken_promise the asynchronous task abandoned its shared state future_already_retrieved the contents of shared state were already accessed through std::future promise_already_satisfied attempt to store a value in the shared state twice no_state attempt to access std::promise or std::future without an associated shared state [edit] Non-member functions [edit] Helper classes [edit] Example [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 2056 C++11broken_promise was specified to be zero which is conventionally used to mean âno errorâ specified to be non-zero [edit] See also
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