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environmentornull
2009 Jun 02
2
formal argument "envir" matched by multiple actual arguments
...k. The idea is that objects of
class A can be named. All A objects with the same name form a group.
The code below implements a simple mechanism to trigger some action when
a group is completely removed from memory i.e. when the last object in
a group is garbage collected.)
setClassUnion("environmentORNULL", c("environment", "NULL"))
setClass("A",
representation(
aa="integer",
groupname="character",
groupanchor="environmentORNULL"
)
)
.A.group.sizes <- new.env(hash=TRUE, parent=emptyenv())...