Collaboration diagram for Futures:

Classes
class	std::future_error

struct	std::is_error_code_enum< future_errc >

Enumerations
enum	std::future_errc { future_already_retrieved, promise_already_satisfied, no_state, broken_promise }

enum	std::future_status { ready, timeout, deferred }

enum	std::launch { async, deferred }

Functions
template<typename _Fn , typename... _Args>
future< typename result_of < _Fn(_Args...)>::type >	std::async (launch __policy, _Fn &&__fn, _Args &&...__args)

template<typename _Fn , typename... _Args>
future< typename result_of < _Fn(_Args...)>::type >	std::async (_Fn &&__fn, _Args &&...__args)

const error_category &	std::future_category () noexcept

error_code	std::make_error_code (future_errc __errc) noexcept

error_condition	std::make_error_condition (future_errc __errc) noexcept

constexpr launch	std::operator& (launch __x, launch __y)

launch &	std::operator&= (launch &__x, launch __y)

constexpr launch	std::operator^ (launch __x, launch __y)

launch &	std::operator^= (launch &__x, launch __y)

constexpr launch	std::operator\| (launch __x, launch __y)

launch &	std::operator\|= (launch &__x, launch __y)

constexpr launch	std::operator~ (launch __x)