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Showing content from https://timsong-cpp.github.io/cppwp/n4659/futures.errors below:

[futures.errors]

33 Thread support library [thread] 33.6 Futures [futures] 33.6.3 Error handling [futures.errors]

const error_category& future_category() noexcept;

Returns:  A reference to an object of a type derived from class error_­category.

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 shall return a pointer to the string "future".

error_code make_error_code(future_errc e) noexcept;

Returns: error_­code(static_­cast<int>(e), future_­category()).

error_condition make_error_condition(future_errc e) noexcept;

Returns: error_­condition(static_­cast<int>(e), future_­category()).


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