is.null.externalptr

pointer

The pointer is treated as an externalptr and checked via a call in C to see if it is NULL.

Provides methods to parse, query and serialize information
    stored in the Resource Description Framework (RDF). RDF is described at <http://www.w3.org/TR/rdf-primer>.
    This package supports RDF by implementing an R interface to the Redland RDF C library,
    described at <http://librdf.org/docs/api/index.html>. In brief, RDF provides a structured graph
    consisting of Statements composed of Subject, Predicate, and Object Nodes.

is.null.externalptr: Determine whether an externalptr object is NULL.

Description

Usage

Arguments

Value