tokens_xptr
is a external pointer-based tokens object designed to process a
large corpus efficiently.
is.tokens_xptr(x)
as.tokens_xptr(x)
# S3 method for tokens
as.tokens_xptr(x)
# S3 method for tokens_xptr
as.tokens_xptr(x)
a tokens object to convert or a tokens_xptr
object to deep copy.