On 07/23/2013 09:59 AM, Simon Zehnder wrote:
Hi David,
thanks for the reply. You are right. Using the %in% is more stable and I gonna
change my code.
you said you were you were using S4 classes. S4 classes do not report vectors of
length != 1, from ?class
For objects which have a formal class, its name is returned by 'class'
as a character vector of length one
so a first unit test could be
stopifnot(length(class(myObject)) != 1L)
When testing for a specific class using 'is' one has to start at the lowest
heir and walk up the inheritance structure. Starting at the checks at the root
will always give TRUE. Having a structure which is quite complicated let me
move to the check I suggested in my first mail.
Best
Simon
On Jul 23, 2013, at 6:15 PM, David Winsemius <dwinsem...@comcast.net> wrote:
On Jul 23, 2013, at 5:36 AM, Simon Zehnder wrote:
Dear R-Users and R-Devels,
I have large project based on S4 classes. While writing my unit tests I found
out, that 'is' cannot test for a specific class, as also inherited classes can
be treated as their super classes. I need to do checks for specific classes.
What I do right now is sth. like
if (class(myClass) == "firstClass") {
I would think that you would need to use `%in%` instead.
if( "firstClass" %in% class(myObject) ){
Objects can have more than one class, so testing with "==" would fail in those
instances.
} else if (class(myClass) == "secondClass") {
}
Is this the usual way how classes are checked in R?
Well, `inherits` IS the usual way.
I was expecting some specific method (and 'inherits' or 'extends' is not what I
look for)...
Best
Simon
[[alternative HTML version deleted]]
Plain-text format is the recommended format for Rhelp
--
David Winsemius
Alameda, CA, USA
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109
Location: Arnold Building M1 B861
Phone: (206) 667-2793
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
