R devel - Nov 2010 - R5 reference classes: how to initialize exactly?

Dear List,

 

So far, I really like those new R5 classes. But what kind of puzzles me is
that it''s not just enough to define the actual reference class, I also
have
to assign it to an object (e.g. ''MyRefObj'') in order to fire
''MyRefObj$new(.)''.

 

S4:

setClass("Blabla", .)

x <- new("Blabla")

 

R5:

MyRefObj <- setRefClass("Blabla", .)

x <- MyRefObj$new(.)

 

But then how do I define a reference class in a package that should be
available after the package is loaded via ''library(my_pkg)'' as
there is no
''MyRefObj'' at startup yet? Do I have to call the script where
the definition
lives?

 

Thanks for any comments,

Janko

 


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Sorry, I was stupid:

 

MyRefObj <- setRefClass("Blabla", .)

 

One can always get the generator object of an defined class with
''getRefClass()''. So:

 

g <- getRefClass("Blabla")

x <- g$new(.)

 

Regards,

Janko

 

 

Von: Janko Thyson [mailto:janko.thyson@ku-eichstaett.de] 
Gesendet: Dienstag, 16. November 2010 00:27
An: ''r-devel@r-project. org''
Betreff: R5 reference classes: how to initialize exactly?

 

Dear List,

 

So far, I really like those new R5 classes. But what kind of puzzles me is
that it''s not just enough to define the actual reference class, I also
have
to assign it to an object (e.g. ''MyRefObj'') in order to fire
''MyRefObj$new(.)''.

 

S4:

setClass("Blabla", .)

x <- new("Blabla")

 

R5:

MyRefObj <- setRefClass("Blabla", .)

x <- MyRefObj$new(.)

 

But then how do I define a reference class in a package that should be
available after the package is loaded via ''library(my_pkg)'' as
there is no
''MyRefObj'' at startup yet? Do I have to call the script where
the definition
lives?

 

Thanks for any comments,

Janko

 


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