Class "externalStorage", base class for external storage for objects of class "externalVectorWithStorage"

Description

The "externalStorage" class represents the base class of the storage backend implementation used by the class "externalVectorWithSToraghe". A pointer to the external storage allocated or accessed by an object of class "externalStorage" is kept in an external pointer.

Objects from the Class

A virtual Class: No objects may be created from it.

Slots

ptr:

Object of class "externalptr", keeps the pointer to the external storage.

type:

Object of class "vector", a vector object of length one representing the type of object stored in the external storage. Usually one of the basic R vector types.

length:

Object of class "integer", Cached value for the length of the vector stored in the external storage.

Extends

Class "externalResource", directly.

Methods

Signature components for the methods:

allocator(resource):

The allocator to be used by default with this resource. Returns an object of class "gcAllocator".

getPointer(reource):

Return the ptr slot.

initializeResource(resource, ptr, size, type, ...):

Set the ptr slot of resource to ptr.

initialize(.Object, type = logical(1), length = as.integer(0)):

This checks the validity of type and length arguments and coerce the length argument to class "integer" before using them to set the corresponding slots. Finally a call to callNextMethod is made to use the initializer for class "externalResource" which, via a call to the initializeResource method above sets ptr slot.

internalType(x):

The type of object to be stored within the resource. It is an R basic vector type ("logical", "integer", "numeric", "complex", "character" or "list").

getNativeStorageMethods(x):

Get the "externalptr" stored in the "nativeStorageMethods" object associated with a particular subclass of "externalStorage" and a basic R vector type.

See Also

setExternalStorageClass for how to set a subclass of "externalStorage".

nativeStorageMethods-class for the C structure containing C function pointers for a particular storage methods class.

externalVectorWithStorage-class for how the "externalStorage" class is used.

simpleStorage-class for a simple implementation of "externalStorage".