R/pairlist.R

In robertzk/monadicbase: The R Base Package

#  File src/library/base/R/pairlist.R
#  Part of the R package, https://www.R-project.org
#
#  Copyright (C) 1995-2012 The R Core Team
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  A copy of the GNU General Public License is available at
#  https://www.R-project.org/Licenses/

as.pairlist <- function(x) .Internal(as.vector(x, "pairlist"))
pairlist <- function(...) as.pairlist(list(...))
## This is now .Primitive:
##is.pairlist <- function(x) typeof(x) == "pairlist"