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std::future_errc(3) C++ Standard Libary std::future_errc(3) NAME std::future_errc - std::future_errc Synopsis Defined in header <future> enum class future_errc { broken_promise = /* implementation-defined */, future_already_retrieved = /* implementation-defined */, (since C++11) promise_already_satisfied = /* implementation-defined */, no_state = /* implementation-defined */ }; The scoped enumeration std::future_errc defines the error codes re- ported by std::future and related classes in std::future_error exception ob- jects. Only four error codes are required, although the implementation may define ad- ditional error codes. Because the appropriate specialization of std::is_er- ror_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 Constant Explanation broken_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::fu- ture without an associated shared state Non-member functions make_error_code(std::future_errc) constructs a future error code (C++11) (function) make_error_condition(std::future_errc) constructs a future er- ror_condition (C++11) (function) Helper classes is_error_code_enum<std::future_errc> extends the type trait std::is_error_code_enum (C++11) to identify future error codes (class template) Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 2056 C++11 broken_promise was specified to be zero which specified to be is conventionally used to mean "no error" non-zero See also error_code holds a platform-dependent error code (C++11) (class) error_condition holds a portable error code (C++11) (class) http://cppreference.com 2022.07.31 std::future_errc(3)
NAME | Synopsis | Member constants | Non-member functions | Helper classes | Example | See also
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