Nothing
#
# This work was created by the National Center for Ecological Analysis and Synthesis.
#
# Copyright 2015 Regents of the University of California
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#' Determine whether an externalptr object is NULL.
#'
#' The pointer is treated as an externalptr and checked via a call in C to see if it is NULL.
#' @param pointer externalptr to be checked for NULL value
#' @return logical TRUE if the pointer is NULL, otherwise FALSE
#' @export
is.null.externalptr <- function(pointer) {
if (!inherits(pointer, "externalptr")) stop("pointer is not an externalptr.")
rv <- .Call("isnull", pointer)
return(rv)
}
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