assignInNamespace and new bindings
Le 31/05/11 12:01, Prof Brian Ripley a ?crit :
On Tue, 31 May 2011, Prof Brian Ripley wrote:
On Tue, 31 May 2011, Romain Francois wrote:
Hello, assignInNamespace refuses to assign an object to a name that is not already used in the namespace.
That's intentional, and as documented: ?assignInNamespace? and ?fixInNamespace? are invoked for their side effect of changing the object in the name space. ^^^^^^^^ I very much doubt we want to allow adding objects.
Even clearer, the Note says They can only be used to change the values of objects in the name space, not to create new objects.
Sure.
I'll just keep using this small workaround, unexported from the next Rcpp:
# just like assignInNamespace but first checks that the binding exists
forceAssignInNamespace <- function( x, value, env ){
is_ns <- isNamespace( env )
if( is_ns && exists( x, env ) && bindingIsLocked(x, env ) ){
unlockBinding( x, env )
}
assign( x, value, env )
if( is_ns ){
lockBinding( x, env )
}
}
I find this useful for when a package wants to assign in its own namespace.
Romain
Something like this would make it possible:
--- src/library/utils/R/objects.R (revision 56024)
+++ src/library/utils/R/objects.R (working copy)
@@ -252,8 +252,9 @@
stop("environment specified is not a package")
ns <- asNamespace(substring(nm, 9L))
} else ns <- asNamespace(ns)
- if(bindingIsLocked(x, ns)) {
- unlockBinding(x, ns)
+ new_binding <- !exists(x,ns)
+ if( new_binding || bindingIsLocked(x, ns)) {
+ if(!new_binding) unlockBinding(x, ns)
assign(x, value, envir = ns, inherits = FALSE)
w <- options("warn")
on.exit(options(w))
Romain
--
Romain Francois
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|- http://bit.ly/hdKhCy : Rcpp article in JSS
|- http://bit.ly/elZJRJ : Montpellier Comedie Club - Avril 2011
`- http://bit.ly/fhqbRC : Rcpp workshop in Chicago on April 28th
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-- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Romain Francois Professional R Enthusiast +33(0) 6 28 91 30 30 http://romainfrancois.blog.free.fr http://romain-francois.com |- http://bit.ly/hdKhCy : Rcpp article in JSS |- http://bit.ly/elZJRJ : Montpellier Comedie Club - Avril 2011 `- http://bit.ly/fhqbRC : Rcpp workshop in Chicago on April 28th