33 Concurrency support library [thread]

33.10 Futures [futures]

33.10.3 Error handling [futures.errors]

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const error_category& future_category() noexcept;
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Returns: A reference to an object of a type derived from class error_category.
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The object's default_error_condition and equivalent virtual functions shall behave as specified for the class error_category.
The object's name virtual function returns a pointer to the string "future".
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error_code make_error_code(future_errc e) noexcept;
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Returns: error_code(static_cast<int>(e), future_category()).
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error_condition make_error_condition(future_errc e) noexcept;
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Returns: error_condition(static_cast<int>(e), future_category()).