ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy > Class Template Reference

Utility to register hooks into a host class that attach client data. More...

#include <ClientData.h>

Inheritance diagram for ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >:

Collaboration diagram for ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >:

Classes
class	RegisteredFactory
	Client code makes static instance from a factory of attachments; passes it to Get or Find as a retrieval key. More...

Public Types
using	DataType = ClientData
using	DataPointer = Pointer< ClientData >
using	DataFactory = std::function< DataPointer(Host &) >
	Type of function from which RegisteredFactory is constructed; it builds attachments. More...

Public Member Functions
	~Site ()
	Site ()
	Site (const Site &other)
Site &	operator= (const Site &other)
	Site (Site &&other)
Site &	operator= (Site &&other)
size_t	size () const
	How many attachment pointers are in the Site. More...
Retrieval and reassignment of attachments
template<typename Subclass = ClientData>
Subclass &	Get (const RegisteredFactory &key)
	Get reference to an attachment, creating on demand if not present, down-cast it to Subclass. More...
template<typename Subclass = const ClientData>
auto	Get (const RegisteredFactory &key) const -> std::enable_if_t< std::is_const< Subclass >::value, Subclass & >
	Get reference to an attachment, creating on demand if not present, down-cast it to Subclass. More...
template<typename Subclass = ClientData>
Subclass *	Find (const RegisteredFactory &key)
	Get a (bare) pointer to an attachment, or null, down-cast it to Subclass *; will not create on demand. More...
template<typename Subclass = const ClientData>
auto	Find (const RegisteredFactory &key) const -> std::enable_if_t< std::is_const< Subclass >::value, Subclass * >
	Get a (bare) pointer to an attachment, or null, down-cast it to Subclass *; will not create on demand. More...
template<typename ReplacementPointer >
void	Assign (const RegisteredFactory &key, ReplacementPointer &&replacement)
	Reassign Site's pointer to ClientData. More...

Static Public Member Functions
static size_t	numFactories ()
	How many static factories have been registered with this specialization of Site. More...

Protected Member Functions
member functions for use by @b Host
template<typename Function >
void	ForEach (const Function &function)
	Invoke function on each ClientData object that has been created in this. More...
template<typename Function >
void	ForEach (const Function &function) const
	Invoke function on each ClientData object that has been created in this. More...
template<typename Function >
ClientData *	FindIf (const Function &function)
	Return pointer to first attachment in this that is not null and satisfies a predicate, or nullptr. More...
template<typename Function >
const ClientData *	FindIf (const Function &function) const
	Return pointer to first attachment in this that is not null and satisfies a predicate, or nullptr. More...
void	BuildAll ()
	For each RegisteredFactory, if the corresponding attachment is absent in this, build and store it. More...

Private Types
using	DataFactories = Lockable< std::vector< DataFactory >, RegistryLockingPolicy >
using	DataContainer = Lockable< Copyable< std::vector< DataPointer >, ObjectCopyingPolicy >, ObjectLockingPolicy >

Private Member Functions
template<typename Subclass >
Subclass &	DoGet (Locked< DataContainer > &data, const RegisteredFactory &key)
template<typename Subclass >
Subclass *	DoFind (Locked< DataContainer > &data, const RegisteredFactory &key)
Locked< DataContainer >	GetData ()
Locked< const DataContainer >	GetData () const
DataPointer &	Build (Locked< DataContainer > &, typename DataContainer::iterator iter, size_t index)

Static Private Member Functions
static Locked< DataFactories >	GetFactories ()
static void	EnsureIndex (Locked< DataContainer > &data, size_t index)
static DataContainer::iterator	GetIterator (Locked< DataContainer > &data, size_t index)

Private Attributes
decltype(Dereferenceable(std::declval< DataPointer & >()))	Slot (Locked< DataContainer > &data, const RegisteredFactory &key, bool create)
DataContainer	mData
	Container of pointers returned by factories, per instance of Host class. More...

Detailed Description

template<typename Host, typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>
class ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >

Utility to register hooks into a host class that attach client data.

This allows the host object to be the root of an ownership tree of sub-objects at run-time, but inverting the compile-time dependency among implementation files: The host's implementation is in low-level files, and cyclic file dependencies are avoided. The set of client objects attached to each host object is not fixed in the definition of the host class, but instead a system of registration of factories of client objects lets it be open-ended.

Besides mere storage and retrieval, this can also implement the observer pattern, in which the host pushes notifications to some virtual function defined in each attached item.

Host side usage pattern

class Host;
class AbstractClientData // Abstract base class for attached data
{
   virtual ~AbstractClientData(); // minimum for memory management
 
   // optional extra observer protocols
   virtual void NotificationMethod(
      // maybe host passes reference to self, maybe not
      // Host &host
   ) = 0;
};
 
class Host
   : public ClientData::Site< Host, AbstractClientData >
   // That inheritance is a case of CRTP
   // (the "curiously recurring template pattern")
   // in which the base class takes the derived class as a template argument
{
public:
   Host()
   {
      // If using an Observer protocol, force early creation of all client
      // data:
      BuildAll();
   }
 
   void NotifyAll()
   {
      // Visit all non-null objects
      ForEach( []( AbstractClientData &data ){
         data.NotificationMethod(
           // *this
         );
      } );
   }
}

Client side usage pattern

class MyClientData : public AbstractClientData
{
public:
   MyClientData( Host &host )
   {
      // ... use host, maybe keep a back pointer to it, maybe not,
      // depending how Host declares NotificationMethod ...
      // ... Maybe Host too is an abstract class and we invoke some
      // virtual function of it ...
   }
   void NotificationMethod(
      // Host &host
   ) override
   {
      // ... Observer actions
      // (If there is more than one separately compiled module using this
      // protocol, beware that the sequence of notifications is unspecified)
   }
 
private:
   int mExtraStuff;
};
 
// Registration of a factory at static initialization time, to be called
// when a Host uses BuildAll, or else lazily when client code uses
// Host::Get()
static const Host::RegisteredFactory key{
   []( Host &host ){ return std::make_unique< MyClientData >( host ); }
};
 
// Use of that key at other times, not dependent on notifications from
// the core
void DoSomething( Host &host )
{
   // This may force lazy construction of MyClientData, always returning
   // an object (or else throwing)
   auto &data = host.Get< MyClientData >( key );
   auto val = pData->mExtraStuff;
   // ...
}
 
void DoAnotherThing( Host &host )
{
   // Does not force lazy construction of MyClientData
   auto *pData = host.Find< MyClientData >( key );
   if ( pData ) {
      auto val = data.mExtraStuff;
      // ...
   }
}
 
void DoYetAnotherThing( Host &host )
{
   // Reassign the pointer in this client's slot
   host.Assign( key, MyReplacementObject( host ) );
}

Lazy or eager construction

If the client only needs retrieval, it might need construction of data only on demand. But if the host is meant to push notifications to the clients, then the host class is responsible for forcing early building of all ClientData when host is constructed, as in the example above.

Unusual registration sequences

If registration of a factory happens after some host objects are already in existence, their associated client data fail to be created if you rely only on BuildAll in the @B Host constructor. Early deregistration of factories is permitted, in which case any later constructed host objects will carry null pointers in the associated slot, and a small "leak" in the space of per-host slots will persist until the program exits. All such usage is not recommended.

Template Parameters

Host	Type that derives from this base class; it supports hooks to invoke attached object factories. This is an example of the curiously recurring template pattern
ClientData	Common base class of attachments; must have a virtual destructor
CopyingPolicy	CopyingPolicy value Chooses deep, shallow, or (default) no-op copying of attachments
Pointer	The kind of pointer Host will hold to ClientData; default is std::unique_ptr. You might want to use std::shared_ptr, std::weak_ptr, or wxWeakRef instead
ObjectLockingPolicy	LockingPolicy value chooses thread safety policy for array of attachments in each Host, default is unsafe
RegistryLockingPolicy	LockingPolicy value chooses thread safety policy for the static table of attachment factory functions, default is unsafe

Definition at line 227 of file ClientData.h.

Member Typedef Documentation

DataContainer

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

using ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DataContainer = Lockable< Copyable< std::vector< DataPointer >, ObjectCopyingPolicy >, ObjectLockingPolicy >

private

Definition at line 474 of file ClientData.h.

DataFactories

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

using ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DataFactories = Lockable< std::vector< DataFactory >, RegistryLockingPolicy >

private

Definition at line 472 of file ClientData.h.

DataFactory

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

using ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DataFactory = std::function< DataPointer( Host& ) >

Type of function from which RegisteredFactory is constructed; it builds attachments.

Definition at line 239 of file ClientData.h.

DataPointer

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

using ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DataPointer = Pointer< ClientData >

Definition at line 237 of file ClientData.h.

DataType

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

using ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DataType = ClientData

Definition at line 236 of file ClientData.h.

Constructor & Destructor Documentation

~Site()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::~Site ( )

inline

Definition at line 230 of file ClientData.h.

   {
      static_assert( std::has_virtual_destructor<ClientData>::value,
         "ClientData::Site requires a data class with a virtual destructor" );
   }

Site() [1/3]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Site ( )

inline

Definition at line 241 of file ClientData.h.

   {
      auto factories = GetFactories();
      auto size = factories.mObject.size();
      mData.reserve( size );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetFactories(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData, and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::size().

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Site() [2/3]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Site ( const Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy > &  other )

inline

Definition at line 247 of file ClientData.h.

      : mData( other.mData )
      { }

Site() [3/3]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Site ( Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy > &&  other )

inline

Definition at line 252 of file ClientData.h.

      : mData( std::move(other.mData) )
      { }

Member Function Documentation

Assign()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename ReplacementPointer >

void ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Assign ( const RegisteredFactory &  key, ReplacementPointer &&  replacement  )

inline

Reassign Site's pointer to ClientData.

If ObjectLockingPolicy isn't default, then reassignments are serialized.

Template Parameters

ReplacementPointer

Pointer<Subclass> where Subclass derives ClientData

Parameters

key	Reference to static object created in client code
replacement	A temporary or std::move'd pointer

Definition at line 363 of file ClientData.h.

   {
      auto index = key.mIndex;
      auto data = GetData();
      EnsureIndex( data, index );
      auto iter = GetIterator( data, index );
      // Copy or move as appropriate:
      *iter = std::forward< ReplacementPointer >( replacement );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::EnsureIndex(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetIterator(), key, and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::RegisteredFactory::mIndex.

Referenced by AdornedRulerPanel::Destroy(), and TrackPanel::Destroy().

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Build()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

DataPointer & ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Build ( Locked< DataContainer > &  , typename DataContainer::iterator  iter, size_t  index  )

inlineprivate

Definition at line 551 of file ClientData.h.

   {
      // If there is no object at index, then invoke the factory, else do
      // nothing.
      // The factory may be null or may return null, in which case do nothing.
      auto &result = *iter;
      if (!Dereferenceable(result)) {
         // creation on demand
         auto factories = GetFactories();
         auto &factory = factories.mObject[index];
         result = factory
            ? factory( static_cast< Host& >( *this ) )
            : DataPointer{};
      }
      return result;
   }

References ClientData::Dereferenceable(), cloud::factory, ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetFactories(), and audacity::network_manager::common_headers::Host.

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll().

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BuildAll()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

void ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll ( )

inlineprotected

For each RegisteredFactory, if the corresponding attachment is absent in this, build and store it.

Definition at line 449 of file ClientData.h.

   {
      // Note that we cannot call this function in the Site constructor as we
      // might wish, because we pass *this to the factories, but this is not yet
      // fully constructed as the ultimate derived class.  So delayed calls to
      // this function are needed.
      size_t size;
      {
         auto factories = GetFactories();
         size = factories.mObject.size();
         // Release lock on factories before getting one on data -- otherwise
         // there would be a deadlock possibility inside Ensure
      }
      auto data = GetData();
      EnsureIndex( data, size - 1 );
      auto iter = GetIterator( data, 0 );
      for ( size_t ii = 0; ii < size; ++ii, ++iter )
         static_cast< void >( Build( data, iter, ii ) );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Build(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::EnsureIndex(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetFactories(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetIterator(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::size().

Referenced by WaveChannelView::BuildSubViews().

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DoFind()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Subclass >

Subclass * ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DoFind ( Locked< DataContainer > &  data, const RegisteredFactory &  key  )

inlineprivate

Definition at line 502 of file ClientData.h.

   {
      const auto &d = Slot( data, key, false );
      if (!d)
         return nullptr;
      else
         return static_cast< Subclass* >( &*d );
   }

References key, and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Slot.

DoGet()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Subclass >

Subclass & ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DoGet ( Locked< DataContainer > &  data, const RegisteredFactory &  key  )

inlineprivate

Definition at line 491 of file ClientData.h.

   {
      const auto &d = Slot( data, key, true );
      if (!d)
         // Oops, a factory was deregistered too soon, or returned a null, or
         // the pointer was reassigned null
         THROW_INCONSISTENCY_EXCEPTION;
      return static_cast< Subclass& >( *d );
   }

References key, ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Slot, and THROW_INCONSISTENCY_EXCEPTION.

EnsureIndex()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

static void ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::EnsureIndex ( Locked< DataContainer > &  data, size_t  index  )

inlinestaticprivate

Definition at line 532 of file ClientData.h.

   {
      if (data.mObject.size() <= index)
         data.mObject.resize(index + 1);
   }

References ClientData::Locked< Lockable >::mObject.

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Assign(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll().

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Find() [1/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Subclass = ClientData>

Subclass * ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Find ( const RegisteredFactory &  key )

inline

Get a (bare) pointer to an attachment, or null, down-cast it to Subclass *; will not create on demand.

(Lifetime of the object may depend on the host's lifetime and also on the client's use of Assign(). Site is not responsible for guarantees.)

Template Parameters

Subclass

Expected actual type of attachment, assumed to be correct

Parameters

key	Reference to static object created in client code

Definition at line 341 of file ClientData.h.

   {
      auto data = GetData();
      return DoFind< Subclass >( data, key );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), and key.

Referenced by AdornedRulerPanel::Destroy(), TrackPanel::Destroy(), TimeShiftHandle::Drag(), ProjectWindow::Find(), anonymous_namespace{SyncLock.cpp}::FindSyncLockGroup(), and WaveTrack::ReallyDoGetChannelGroup().

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Find() [2/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Subclass = const ClientData>

auto ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Find ( const RegisteredFactory &  key ) const -> std::enable_if_t< std::is_const< Subclass >::value, Subclass * >

inline

Get a (bare) pointer to an attachment, or null, down-cast it to Subclass *; will not create on demand.

(Lifetime of the object may depend on the host's lifetime and also on the client's use of Assign(). Site is not responsible for guarantees.)

Template Parameters

Subclass

Expected actual type of attachment, assumed to be correct

Parameters

key	Reference to static object created in client code

const overload returns pointers to const only.

Definition at line 350 of file ClientData.h.

   {
      auto data = GetData();
      return DoFind< Subclass >( data, key );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), and key.

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FindIf() [1/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Function >

ClientData * ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::FindIf ( const Function &  function )

inlineprotected

Return pointer to first attachment in this that is not null and satisfies a predicate, or nullptr.

Beware that the sequence of visitation is not specified.

Template Parameters

Function

takes reference to ClientData, returns value convertible to bool

Parameters

function

of type Function

Definition at line 420 of file ClientData.h.

   {
      auto data = GetData();
      for( auto &pObject : data.mObject ) {
         const auto &ptr = Dereferenceable(pObject);
         if ( ptr && function ( *ptr ) )
            return &*ptr;
      }
      return nullptr;
   }

References ClientData::Dereferenceable(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData().

Referenced by NoteTrack::HandleXMLTag(), and WaveChannelView::ToggleSubView().

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FindIf() [2/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Function >

const ClientData * ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::FindIf ( const Function &  function ) const

inlineprotected

Return pointer to first attachment in this that is not null and satisfies a predicate, or nullptr.

Beware that the sequence of visitation is not specified.

Template Parameters

Function

takes reference to ClientData, returns value convertible to bool

Parameters

function

of type Function

const overload only compiles with a function callable with a const reference to ClientData.

Definition at line 434 of file ClientData.h.

   {
      auto data = GetData();
      for( auto &pObject : data.mObject ) {
         const auto &ptr = Dereferenceable(pObject);
         if ( ptr ) {
            const auto &c_ref = *ptr;
            if ( function( c_ref ) )
               return &*c_ref;
         }
      }
      return nullptr;
   }

References ClientData::Dereferenceable(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData().

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ForEach() [1/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Function >

void ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::ForEach ( const Function &  function )

inlineprotected

Invoke function on each ClientData object that has been created in this.

Template Parameters

Function

takes reference to ClientData, return value is ignored

Parameters

function

of type Function

Definition at line 388 of file ClientData.h.

   {
      auto data = GetData();
      for( auto &pObject : data.mObject ) {
         const auto &ptr = Dereferenceable(pObject);
         if ( ptr )
            function( *ptr );
      }
   }

References ClientData::Dereferenceable(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData().

Referenced by WaveChannelView::DoSetDisplay(), WaveChannelView::DoSetMinimized(), WaveChannelView::GetAllSubViews(), WaveChannelView::GetDisplays(), WaveChannelView::GetSubViews(), Track::HandleCommonXMLAttribute(), WaveChannelView::Reparent(), and Track::WriteCommonXMLAttributes().

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ForEach() [2/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Function >

void ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::ForEach ( const Function &  function ) const

inlineprotected

Invoke function on each ClientData object that has been created in this.

Template Parameters

Function

takes reference to ClientData, return value is ignored

Parameters

function

of type Function

const overload only compiles with a function that takes reference to const ClientData.

Definition at line 401 of file ClientData.h.

   {
      auto data = GetData();
      for( auto &pObject : data.mObject ) {
         const auto &ptr = Dereferenceable(pObject);
         if ( ptr ) {
            const auto &c_ref = *ptr;
            function( c_ref );
         }
      }
   }

References ClientData::Dereferenceable(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData().

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Get() [1/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Subclass = ClientData>

Subclass & ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Get ( const RegisteredFactory &  key )

inline

Get reference to an attachment, creating on demand if not present, down-cast it to Subclass.

Uses static_cast. Throws on failure to create it. (Lifetime of the object may depend on the host's lifetime and also on the client's use of Assign(). Site is not responsible for guarantees.)

Template Parameters

Subclass

Expected actual type of attachment, assumed to be correct

Parameters

key	Reference to static object created in client code

Definition at line 317 of file ClientData.h.

   {
      auto data = GetData();
      return DoGet< Subclass >( data, key );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), and key.

Referenced by SetTrackStatusCommand::ApplyInner(), AdornedRulerPanel::Get(), ProjectWindow::Get(), RealtimeEffectPanel::Get(), TrackPanel::Get(), WaveTrackFactory::Get(), anonymous_namespace{WaveTrack.cpp}::WaveTrackData::Get(), RealtimeEffectStateUI::Get(), TrackPanel::GetFocusedCell(), LabelTrackView::IsValidIndex(), anonymous_namespace{Contrast.cpp}::anonymous_namespace{Contrast.cpp}::OnContrast(), anonymous_namespace{HistoryWindow.cpp}::OnHistory(), NavigationActions::Handler::OnLastTrack(), anonymous_namespace{MixerBoard.cpp}::OnMixerBoard(), anonymous_namespace{FreqWindow.cpp}::OnPlotSpectrum(), WaveTrackMenuTable::OnSwapChannels(), NavigationActions::Handler::OnToggle(), anonymous_namespace{TrackMenus.cpp}::OnTrackClose(), anonymous_namespace{TrackMenus.cpp}::OnTrackGain(), anonymous_namespace{TrackMenus.cpp}::OnTrackGainDec(), anonymous_namespace{TrackMenus.cpp}::OnTrackGainInc(), anonymous_namespace{TrackMenus.cpp}::OnTrackMoveBottom(), anonymous_namespace{TrackMenus.cpp}::OnTrackMoveDown(), anonymous_namespace{TrackMenus.cpp}::OnTrackMoveTop(), anonymous_namespace{TrackMenus.cpp}::OnTrackMoveUp(), anonymous_namespace{TrackMenus.cpp}::OnTrackMute(), anonymous_namespace{TrackMenus.cpp}::OnTrackPan(), anonymous_namespace{TrackMenus.cpp}::OnTrackPanLeft(), anonymous_namespace{TrackMenus.cpp}::OnTrackPanRight(), anonymous_namespace{TrackMenus.cpp}::OnTrackSolo(), EffectNoiseRemoval::ProcessOne(), GetInfoCommand::SendTracks(), MuteButtonHandle::Tip(), SoloButtonHandle::Tip(), EffectsButtonHandle::Tip(), MenuButtonHandle::Tip(), and CloseButtonHandle::Tip().

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Get() [2/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

template<typename Subclass = const ClientData>

auto ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Get ( const RegisteredFactory &  key ) const -> std::enable_if_t< std::is_const< Subclass >::value, Subclass & >

inline

Get reference to an attachment, creating on demand if not present, down-cast it to Subclass.

Uses static_cast. Throws on failure to create it. (Lifetime of the object may depend on the host's lifetime and also on the client's use of Assign(). Site is not responsible for guarantees.)

Template Parameters

Subclass

Expected actual type of attachment, assumed to be correct

Parameters

key	Reference to static object created in client code

const overload returns const references only.

Definition at line 326 of file ClientData.h.

   {
      auto data = GetData();
      return DoGet< Subclass >( data, key );
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), and key.

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GetData() [1/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

Locked< DataContainer > ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData ( )

inlineprivate

Definition at line 522 of file ClientData.h.

   {
      return Locked< DataContainer >{ mData };
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData.

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Assign(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Find(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::FindIf(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::ForEach(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Get().

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GetData() [2/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

Locked< const DataContainer > ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData ( ) const

inlineprivate

Definition at line 527 of file ClientData.h.

   {
      return Locked< const DataContainer >{ mData };
   }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData.

GetFactories()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

static Locked< DataFactories > ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetFactories ( )

inlinestaticprivate

Definition at line 511 of file ClientData.h.

   {
      // C++11 does not need extra thread synch for static initialization
      // Note that linker eliminates duplicates of this function
      static DataFactories factories;
 
      // But give back a scoped lock to the user of this function, in case
      // there is contention to resize the vector
      return Locked< DataFactories >{ factories };
   }

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Build(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::numFactories(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::RegisteredFactory::RegisteredFactory(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Site(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::RegisteredFactory::~RegisteredFactory().

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GetIterator()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

static DataContainer::iterator ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetIterator ( Locked< DataContainer > &  data, size_t  index  )

inlinestaticprivate

Definition at line 539 of file ClientData.h.

   {
      // This function might help generalize Site with different kinds of
      // containers for pointers to ClientData that are not random-access.
      // Perhaps non-relocation of elements will be needed.
      // Perhaps another template-template parameter could vary the kind of
      // container.
      auto result = data.mObject.begin();
      std::advance( result, index );
      return result;
   }

References ClientData::Locked< Lockable >::mObject.

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Assign(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll().

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numFactories()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

static size_t ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::numFactories ( )

inlinestatic

How many static factories have been registered with this specialization of Site.

Usually agrees with the size() of each site unless some registrations happened later than some Site's construction.

Definition at line 266 of file ClientData.h.

{ return GetFactories().mObject.size(); }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetFactories().

Referenced by Append().

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operator=() [1/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

Site & ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::operator= ( const Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy > &  other )

inline

Definition at line 250 of file ClientData.h.

      { mData = other.mData; return *this; }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData.

operator=() [2/2]

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

Site & ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::operator= ( Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy > &&  other )

inline

Definition at line 255 of file ClientData.h.

      { mData = std::move(other.mData); return *this; }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData.

size()

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

size_t ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::size ( ) const

inline

How many attachment pointers are in the Site.

Definition at line 259 of file ClientData.h.

{ return mData.size(); }

References ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData.

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::BuildAll(), WaveChannelView::BuildSubViews(), anonymous_namespace{TransportMenus.cpp}::DoMoveToLabel(), anonymous_namespace{TrackMenus.cpp}::DoPanTracks(), TrackUtilities::DoTrackMute(), ContrastDialog::GetDB(), anonymous_namespace{FileMenus.cpp}::OnExportLabels(), anonymous_namespace{ExportMIDI.cpp}::OnExportMIDI(), cloud::ShareAudioToolbar::RegenerateTooltips(), AudioSetupToolBar::RegenerateTooltips(), ControlToolBar::RegenerateTooltips(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Site(), and WaveChannelView::ToggleSubView().

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Member Data Documentation

mData

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

DataContainer ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::mData

private

Container of pointers returned by factories, per instance of Host class.

This is the only non-static data member that Site injects into the derived class.

Definition at line 571 of file ClientData.h.

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::GetData(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::operator=(), ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Site(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::size().

Slot

template<typename Host , typename ClientData = Base, CopyingPolicy ObjectCopyingPolicy = SkipCopying, template< typename > class Pointer = UniquePtr, LockingPolicy ObjectLockingPolicy = NoLocking, LockingPolicy RegistryLockingPolicy = NoLocking>

decltype(Dereferenceable(std::declval< DataPointer & >())) ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Slot(Locked< DataContainer > &data, const RegisteredFactory &key, bool create)

inlineprivate

Definition at line 481 of file ClientData.h.

   {
      auto index = key.mIndex;
      EnsureIndex( data, index );
      auto iter = GetIterator( data, index );
      auto &pointer = create ? Build( data, iter, index ) : *iter;
      return Dereferenceable( pointer );
   }

Referenced by ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DoFind(), and ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::DoGet().

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

• ClientData.h