folly::observer::CallbackHandle Class Reference

#include <Observer.h>

Classes
struct	Context

Public Member Functions
	CallbackHandle ()
template<typename T >
	CallbackHandle (Observer< T > observer, folly::Function< void(Snapshot< T >)> callback)
	CallbackHandle (const CallbackHandle &)=delete
	CallbackHandle (CallbackHandle &&)=default
CallbackHandle &	operator= (const CallbackHandle &)=delete
CallbackHandle &	operator= (CallbackHandle &&)=default
	~CallbackHandle ()
void	cancel ()

Private Attributes
std::shared_ptr< Context >	context_

Detailed Description

Definition at line 121 of file Observer.h.

Constructor & Destructor Documentation

folly::observer::CallbackHandle::CallbackHandle ( )

inline

Definition at line 81 of file Observer-inl.h.

{}

template<typename T >

folly::observer::CallbackHandle::CallbackHandle	(	Observer< T >	observer,
		folly::Function< void(Snapshot< T >)>	callback
	)

Definition at line 84 of file Observer-inl.h.

References context, folly::observer::makeObserver(), folly::gen::move, and folly::unit.

                                               {
  context_ = std::make_shared<Context>();
  context_->observer = makeObserver([observer = std::move(observer),
                                     callback = std::move(callback),
                                     context = context_]() mutable {
    auto rCanceled = context->canceled.rlock();
    if (*rCanceled) {
      return folly::unit;
    }
    callback(*observer);
    return folly::unit;
  });
}

folly::observer::CallbackHandle::CallbackHandle ( const CallbackHandle &  )

delete

folly::observer::CallbackHandle::CallbackHandle ( CallbackHandle &&  )

default

folly::observer::CallbackHandle::~CallbackHandle ( )

inline

Definition at line 100 of file Observer-inl.h.

                                       {
  cancel();
}

Member Function Documentation

void folly::observer::CallbackHandle::cancel ( )

inline

Definition at line 104 of file Observer-inl.h.

                                   {
  if (!context_) {
    return;
  }
  context_->observer.reset();
  context_->canceled = true;
  context_.reset();
}

CallbackHandle& folly::observer::CallbackHandle::operator= ( const CallbackHandle &  )

delete

CallbackHandle& folly::observer::CallbackHandle::operator= ( CallbackHandle &&  )

default

Member Data Documentation

std::shared_ptr<Context> folly::observer::CallbackHandle::context_

private

Definition at line 139 of file Observer.h.

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The documentation for this class was generated from the following files:

• proxygen/folly/folly/experimental/observer/Observer.h
• proxygen/folly/folly/experimental/observer/Observer-inl.h