setClass("CNULLValue", contains = "integer", prototype = -919191L)
CNULLValue = new("CNULLValue")
setAs("CNULLValue", "character",
function(from) {
"CNULLValue"
})
isNilPointer =
function(ref)
.Call("R_isNilPointer", ref)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.