Implement ISO/IEC TS 19571:2016 future for void. More...

#include <google/cloud/future_void.h>

Public Types
using	shared_state_type = typename internal::future_base< void >::shared_state_type

Public Member Functions
	future () noexcept

	future (future< future< void >> &&rhs) noexcept(false)
	Creates a new future that unwraps `rhs`. More...

void	get ()
	Waits until the shared state becomes ready, then retrieves the value stored in the shared state. More...

template<typename F >
internal::then_helper< F, void >::future_t	then (F &&func)
	Attach a continuation to the future. More...

	future (std::shared_ptr< shared_state_type > state)

Friends
template<typename U >
class	future

Detailed Description

template<>
class google::cloud::v0::future< void >

Implement ISO/IEC TS 19571:2016 future for void.

Definition at line 35 of file future_void.h.

Member Typedef Documentation

◆ shared_state_type

using google::cloud::v0::future< void >::shared_state_type = typename internal::future_base<void>::shared_state_type

Definition at line 38 of file future_void.h.

Constructor & Destructor Documentation

◆ future() [1/3]

google::cloud::v0::future< void >::future ( )

inlinenoexcept

Definition at line 42 of file future_void.h.

◆ future() [2/3]

google::cloud::v0::future< void >::future ( future< future< void >> && rhs )

noexcept

Creates a new future that unwraps rhs.

This constructor creates a new shared state that becomes satisfied when both rhs and rhs.get() become satisfied. If rhs is satisfied, but rhs.get() returns an invalid future then the newly created future becomes satisfied with a std::future_error exception, and the exception error code is std::future_errc::broken_promise.

Note: The technical specification requires this to be a noexcept constructor I (coryan) believe this is a defect in the technical specification, as this creates a new shared state: shared states are dynamically allocated, and the allocator (which might be the default operator new) may raise.

◆ future() [3/3]

google::cloud::v0::future< void >::future ( std::shared_ptr< shared_state_type > state )

inlineexplicit

Definition at line 106 of file future_void.h.

Member Function Documentation

◆ get()

void google::cloud::v0::future< void >::get ( )

inline

Waits until the shared state becomes ready, then retrieves the value stored in the shared state.

Exceptions

any	exceptions stored in the shared state.
std::future_error	with std::no_state if the future does not have a shared state.

Definition at line 69 of file future_void.h.

◆ then()

template<typename F >

internal::then_helper<F, void>::future_t google::cloud::v0::future< void >::then ( F && func )

inline

Attach a continuation to the future.

Attach a callable func to be invoked when the future is ready. The return type is a future wrapping the return type of func.

Returns: future<T> where T is std::result_of_t<F, R> (basically). If T matches future<U> then it returns future<U>. The returned future will contain the result of func.

Parameters

func	a Callable to be invoked when the future is ready. The function might be called immediately, e.g., if the future is ready.

Side effects: valid() == false if the operation is successful.

Definition at line 99 of file future_void.h.

Friends And Related Function Documentation

◆ future

template<typename U >

friend class future

friend

Definition at line 121 of file future_void.h.

Public Types

Public Member Functions

Friends