SG::ArenaAllocatorRegistryImpl Class Reference

ArenaAllocatorRegistry implementation class. More...

Collaboration diagram for SG::ArenaAllocatorRegistryImpl:

Public Member Functions
	~ArenaAllocatorRegistryImpl ()
	Destructor. More...
size_t	registerCreator (const std::string &name, std::unique_ptr< ArenaAllocatorCreator > creator)
	Register a new allocator type. More...
size_t	lookup (const std::string &name)
	Look up the index for an allocator type name. More...
std::unique_ptr< ArenaAllocatorBase >	create (size_t i)
	Create a new instance of an allocator. More...

Private Types
typedef std::map< std::string, size_t >	map_t
	Map from names to indices. More...
typedef std::lock_guard< std::mutex >	lock_t

Private Attributes
map_t	m_map
std::vector< std::unique_ptr< ArenaAllocatorCreator > >	m_creators
	Vector of factory instances. More...
std::mutex	m_mutex
	Mutex to protect the contents. More...

Detailed Description

ArenaAllocatorRegistry implementation class.

Definition at line 30 of file ArenaAllocatorRegistry.cxx.

Member Typedef Documentation

lock_t

typedef std::lock_guard<std::mutex> SG::ArenaAllocatorRegistryImpl::lock_t

private

Definition at line 79 of file ArenaAllocatorRegistry.cxx.

map_t

typedef std::map<std::string, size_t> SG::ArenaAllocatorRegistryImpl::map_t

private

Map from names to indices.

Definition at line 70 of file ArenaAllocatorRegistry.cxx.

Constructor & Destructor Documentation

~ArenaAllocatorRegistryImpl()

SG::ArenaAllocatorRegistryImpl::~ArenaAllocatorRegistryImpl

(

)

Destructor.

Definition at line 86 of file ArenaAllocatorRegistry.cxx.

{
}

Member Function Documentation

create()

std::unique_ptr< ArenaAllocatorBase > SG::ArenaAllocatorRegistryImpl::create

(

size_t

i

)

Create a new instance of an allocator.

Parameters

i	The index of the allocator to create.

Returns

A newly-allocated allocator instance.

Definition at line 150 of file ArenaAllocatorRegistry.cxx.

{
  lock_t lock (m_mutex);
  assert (i < m_creators.size());
  return m_creators[i]->create();
}

lookup()

size_t SG::ArenaAllocatorRegistryImpl::lookup

(

const std::string &

name

)

Look up the index for an allocator type name.

Parameters

name	The name of the allocator type to find.

Returns

The index corresponding to the type, or std::string::npos if it hasn't yet been registered.

Definition at line 133 of file ArenaAllocatorRegistry.cxx.

{
  lock_t lock (m_mutex);
  map_t::iterator it = m_map.find (name);
  if (it == m_map.end()) {
    return std::string::npos;
  }
  return it->second;
}

registerCreator()

size_t SG::ArenaAllocatorRegistryImpl::registerCreator	(	const std::string &	name,
		std::unique_ptr< ArenaAllocatorCreator >	creator
	)

Register a new allocator type.

Parameters

name	The name of the allocator type.
creator	The factory object to create instances of this type. The registry takes ownership of this pointer.

Returns

The new integer index for this allocator type.

If the allocator type already exists, then the index of the existing one is returned (and the object passed as creator is deleted).

Definition at line 102 of file ArenaAllocatorRegistry.cxx.

{
  lock_t lock (m_mutex);
 
  // See if there's an existing one by this name.
  // Shouldn't usually happen, since we check that the allocator doesn't
  // exist before calling this, but could happen in a MT job.
  // So we need to check it again with the lock held.
  map_t::iterator it = m_map.find (name);
  if (it != m_map.end()) {
    // creator will be deleted.
    return it->second;
  }
 
  // The new index.
  size_t i = m_creators.size();
 
  // Remember the index and store the creator.
  m_map[name] = i;
  m_creators.push_back (std::move (creator));
  return i;
}

Member Data Documentation

m_creators

std::vector<std::unique_ptr<ArenaAllocatorCreator> > SG::ArenaAllocatorRegistryImpl::m_creators

private

Vector of factory instances.

Definition at line 74 of file ArenaAllocatorRegistry.cxx.

m_map

map_t SG::ArenaAllocatorRegistryImpl::m_map

private

Definition at line 71 of file ArenaAllocatorRegistry.cxx.

m_mutex

std::mutex SG::ArenaAllocatorRegistryImpl::m_mutex

private

Mutex to protect the contents.

Definition at line 77 of file ArenaAllocatorRegistry.cxx.

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

• ArenaAllocatorRegistry.cxx