32 Thread support library [thread]

32.9 Futures [futures]

32.9.3 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()).