# selectSuperClasses

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##### Super Classes (of Specific Kinds) of a Class

Return superclasses of ClassDef, possibly only non-virtual or direct or simple ones.

These functions are designed to be fast, and consequently only work with the contains slot of the corresponding class definitions.

Keywords
classes, programming
##### Usage
selectSuperClasses(Class, dropVirtual = FALSE, namesOnly = TRUE, directOnly = TRUE, simpleOnly = directOnly, where = topenv(parent.frame()))
.selectSuperClasses(ext, dropVirtual = FALSE, namesOnly = TRUE, directOnly = TRUE, simpleOnly = directOnly)
##### Arguments
Class
name of the class or (more efficiently) the class definition object (see getClass).
dropVirtual
logical indicating if only non-virtual superclasses should be returned.
namesOnly
logical indicating if only a vector names instead of a named list class-extensions should be returned.
directOnly
logical indicating if only a direct super classes should be returned.
simpleOnly
logical indicating if only simple class extensions should be returned.
where
(only used when Class is not a class definition) environment where the class definition of Class is found.
ext
for .selectSuperClasses() only, a list of class extensions, typically getClassDef(..)@contains.
##### Value

a character vector (if namesOnly is true, as per default) or a list of class extensions (as the contains slot in the result of getClass).

##### Note

The typical user level function is selectSuperClasses() which calls .selectSuperClasses(); i.e., the latter should only be used for efficiency reasons by experienced useRs.

is, getClass; further, the more technical class classRepresentation documentation.
library(methods) setClass("Root") setClass("Base", contains = "Root", representation(length = "integer")) setClass("A", contains = "Base", representation(x = "numeric")) setClass("B", contains = "Base", representation(y = "character")) setClass("C", contains = c("A", "B")) extends("C") #--> "C" "A" "B" "Base" "Root" selectSuperClasses("C") # "A" "B" selectSuperClasses("C", direct=FALSE) # "A" "B" "Base" "Root" selectSuperClasses("C", dropVirt = TRUE, direct=FALSE)# ditto w/o "Root"