std::future_errc

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Thread support library
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(C++11)
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(C++11)
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launch (C++11)
future_status (C++11)
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future_category (C++11)
future_errc (C++11)
 
std::future_errc
Helper classes
is_error_code_enum
Non-member functions
make_error_code
make_error_condition
 
Defined in header <ios>
enum class future_errc {

    broken_promise,
    future_already_retrieved,
    promise_already_satisfied,
    no_state

};
(since C++11)

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.

Contents

[edit] 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::future without an associated shared state

[edit] Helper classes

extends the type trait std::is_error_code_enum to identify future error codes
(class template)

[edit] Non-member functions

constructs a future error code
(function)
constructs a future error_condition
(function)

[edit] Example

[edit] See also

(C++11)
holds a platform-dependent error code
(class)
holds a portable error code
(class)