is.null.externalptr

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 <https://www.w3.org/TR/rdf-primer/>.
This package supports RDF by implementing an R interface to the Redland RDF C library,
described at <https://librdf.org/docs/api/index.html>. In brief, RDF provides a structured graph
consisting of Statements composed of Subject, Predicate, and Object Nodes.

Matthew B Jones

redland

RDF Library Bindings in R

Matthew B. Jones

Peter Slaughter

Jeroen Ooms

Carl Boettiger

Scott Chamberlain

David Beckett

University of Bristol 

Regents of the University of California 

is.null.externalptr function

<dl><dt>pointer</dt>
<dd>externalptr to be checked for NULL value</dd></dl>

Arguments

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

<dl>

<dt>pointer</dt>
<dd>externalptr to be checked for NULL value</dd>

</dl>

Determine whether an externalptr object is NULL.

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

Description

Usage

Value

Arguments