whichSubclasses: Find Selected Subclasses of a Class
In johnmchambers/XRtools: Extending R: Tools and Examples

Description Usage Arguments Value Author(s) Examples

Returns the names of subclasses of a given class, restricted optionally to those of a particular distance (especially 1 for direct subclasses) and to those that are or are not simple extensions. showVectorTypes is just an example that prints all the types of all the basic vector classes.

1 2	whichSubclasses(Class, distance = NA, simple = NA) showVectorTypes(withClasses)

`Class`	The name of the class or its formal definition, as returned by `getClass()`.
`distance`	The range of distance (`1` == direct subclasses, `2` == their direct subclasses, etc.). By default, no restriction.
`simple`	Should these be simple subclasses, that is, those created by the `contains=` argument, without any explicit function to extract or replace the superclass? Legal values: `NA` (no restriction); `TRUE` or `FALSE`.
`withClasses`	In `showVectorTypes()`, should the corresponding clases be printed?

The character vector of names of the selected subclasses.

John Chambers

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## the essential implementation of showVectorTypes()
classes <- whichSubclasses("vector", distance = 1, simple = TRUE)
sapply(classes, function(x) typeof(new(x)))