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% File src/library/base/man/as.function.Rd
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2007 R Core Team
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% Distributed under GPL 2 or later
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\name{as.function}
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\title{Convert Object to Function}
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\usage{
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as.function(x, \dots)
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\method{as.function}{default}(x, envir = parent.frame(), \dots)
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}
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\alias{as.function}
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\alias{as.function.default}
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\arguments{
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  \item{x}{object to convert, a list for the default method.}
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  \item{\dots}{additional arguments, depending on object}
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  \item{envir}{environment in which the function should be defined}
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}
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\description{
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  \code{as.function} is a generic function which is used to convert
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  objects to functions.
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  \code{as.function.default} works on a list \code{x}, which should contain the
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  concatenation of a formal argument list and an expression or an
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  object of mode \code{"\link{call}"} which will become the function body.
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  The function will be defined in a specified environment, by default
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  that of the caller.
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}
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\note{
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  For ancient historical reasons, \code{envir = NULL} uses the global
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  environment rather than the base environment.
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  Please use \code{envir = \link{globalenv}()} instead if this is what you want,
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  as the special handling of \code{NULL} may change in a future release.
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}
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\value{
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  The desired function.
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}
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\author{Peter Dalgaard}
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\seealso{
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  \code{\link{function}};
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  \code{\link{alist}} which is handy for the construction of
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  argument lists, etc.
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}
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\examples{
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as.function(alist(a = , b = 2, a+b))
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as.function(alist(a = , b = 2, a+b))(3)
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}
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\keyword{programming}