Yes, as noted in my previous mail, which crossed yours. If you included
the TestClass in a code_file= in the package skeleton, the default
NAMESPACE file from package.skeleton() will do that for you:
exportPattern("^[[:alpha:]]+")
exportClasses(
"TestClass"
It's certainly true that _if_ you have a namespace file, reference
classes (and all other classes) and generator objects have to be
exported to be used outside the package. Still not quite clear, though,
why _any_ namespace file is needed.
Thanks for the catch.
John
On 2/3/11 1:46 PM, Jeffrey Horner wrote:
Apparently reference classes must be declared in the NAMESPACE file
via an S4 declaration. If I place the following in the NAMESPACE file
all is well:
exportClasses(TestClass)
export(TestClass)
Jeff
On Wed, Feb 2, 2011 at 9:25 PM, Jeffrey Horner<jeffrey.hor...@gmail.com> wrote:
Hi,
I'm trying to create a package that contains reference class
definitions from which users can create reference objects, but there
seems to be something awry.
My toy example creates an empty package via
package.skeleton('TestClass') to which I add the following R code:
TestClass<- setRefClass('TestClass',fields=c('name'))
Unfortunately my R console output bears this:
library(TestClass)
TestClass$new(name='foo')
Error: attempt to apply non-function
getRefClass('TestClass')$new(name='foo')
Error: attempt to apply non-function
Creating the same reference class in the global environment works though:
x<- setRefClass('TestClass',fields='name')
x$new(name='foo')
An object of class "TestClass"
<environment: 0x82a43cc>
I'm new to S4 and reference classes, so maybe I'm missing something fundamental?
Jeff
sessionInfo()
R version 2.13.0 Under development (unstable) (2011-02-02 r54197)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices datasets utils methods base
other attached packages:
[1] TestClass_1.0
loaded via a namespace (and not attached):
[1] tools_2.13.0
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