folly::DelayedDestructionBase::DestructorGuard Class Reference

#include <DelayedDestructionBase.h>

Inheritance diagram for folly::DelayedDestructionBase::DestructorGuard:

Public Member Functions
	DestructorGuard (DelayedDestructionBase *dd)
	DestructorGuard (const DestructorGuard &dg)
	DestructorGuard (DestructorGuard &&dg) noexcept
DestructorGuard &	operator= (DestructorGuard dg) noexcept
DestructorGuard &	operator= (DelayedDestructionBase *dd)
	~DestructorGuard ()
DelayedDestructionBase *	get () const
	operator bool () const

Private Attributes
DelayedDestructionBase *	dd_

Detailed Description

Classes should create a DestructorGuard object on the stack in any function that may invoke callback functions.

The DestructorGuard prevents the guarded class from being destroyed while it exists. Without this, the callback function could delete the guarded object, causing problems when the callback function returns and the guarded object's method resumes execution.

Definition at line 62 of file DelayedDestructionBase.h.

Constructor & Destructor Documentation

folly::DelayedDestructionBase::DestructorGuard::DestructorGuard ( DelayedDestructionBase *  dd )

inlineexplicit

Definition at line 64 of file DelayedDestructionBase.h.

References dd_, and folly::DelayedDestructionBase::guardCount_.

Referenced by operator=().

                                                         : dd_(dd) {
      if (dd_ != nullptr) {
        ++dd_->guardCount_;
        assert(dd_->guardCount_ > 0); // check for wrapping
      }
    }

folly::DelayedDestructionBase::DestructorGuard::DestructorGuard ( const DestructorGuard &  dg )

inline

Definition at line 71 of file DelayedDestructionBase.h.

: DestructorGuard(dg.dd_) {}

folly::DelayedDestructionBase::DestructorGuard::DestructorGuard ( DestructorGuard &&  dg )

inlinenoexcept

Definition at line 73 of file DelayedDestructionBase.h.

        : dd_(std::exchange(dg.dd_, nullptr)) {}

folly::DelayedDestructionBase::DestructorGuard::~DestructorGuard ( )

inline

Definition at line 86 of file DelayedDestructionBase.h.

References dd_, folly::DelayedDestructionBase::guardCount_, and folly::DelayedDestructionBase::onDelayedDestroy().

                       {
      if (dd_ != nullptr) {
        assert(dd_->guardCount_ > 0);
        --dd_->guardCount_;
        if (dd_->guardCount_ == 0) {
          dd_->onDelayedDestroy(true);
        }
      }
    }

Member Function Documentation

DelayedDestructionBase* folly::DelayedDestructionBase::DestructorGuard::get ( ) const

inline

Definition at line 96 of file DelayedDestructionBase.h.

References dd_.

Referenced by folly::DelayedDestructionBase::IntrusivePtr< AliasType >::get(), folly::operator!=(), and folly::operator==().

                                        {
      return dd_;
    }

folly::DelayedDestructionBase::DestructorGuard::operator bool ( ) const

inlineexplicit

Definition at line 100 of file DelayedDestructionBase.h.

References dd_.

                                   {
      return dd_ != nullptr;
    }

DestructorGuard& folly::DelayedDestructionBase::DestructorGuard::operator= ( DestructorGuard  dg )

inlinenoexcept

Definition at line 76 of file DelayedDestructionBase.h.

References dd_, and folly::f14::swap().

Referenced by folly::DelayedDestructionBase::IntrusivePtr< AliasType >::IntrusivePtr(), and folly::DelayedDestructionBase::IntrusivePtr< AliasType >::operator=().

                                                            {
      std::swap(dd_, dg.dd_);
      return *this;
    }

DestructorGuard& folly::DelayedDestructionBase::DestructorGuard::operator= ( DelayedDestructionBase *  dd )

inline

Definition at line 81 of file DelayedDestructionBase.h.

References DestructorGuard().

                                                           {
      *this = DestructorGuard(dd);
      return *this;
    }

Member Data Documentation

DelayedDestructionBase* folly::DelayedDestructionBase::DestructorGuard::dd_

private

Definition at line 105 of file DelayedDestructionBase.h.

Referenced by DestructorGuard(), get(), operator bool(), operator=(), and ~DestructorGuard().

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

• proxygen/folly/folly/io/async/DelayedDestructionBase.h