methodUtilities {methods} | R Documentation |
These are utilities, currently in the methods package, that either provide some functionality needed by the package (e.g., element matching by name), or add compatibility with S-Plus, or both.
functionBody(fun=sys.function(sys.parent()))
allNames(x)
getFunction(name, generic=TRUE, mustFind=TRUE, where)
el(object, where)
elNamed(x, name, mustFind=FALSE)
formalArgs(def)
Quote()
showDefault(object, oldMethods = TRUE)
initMethodDispatch(where = topenv(parent.frame()))
methodSignatureMatrix(object, sigSlots = c("target", "defined"))
allNames
:the character vector of names (unlike names()
, never
returns NULL
).
getFunction
:find the object as a function.
elNamed
:get the element of the vector corresponding to name. Unlike the
[
, [[
, and $
operators, this function
requires name
to match the element name exactly (no partial
matching).
formalArgs
:Returns the names of the formal arguments of this function.
existsFunction
:Is there a function of this name? If generic
is
FALSE
, generic functions are not counted.
findFunction
:return all the indices of the search list on which a function
definition for name
exists.
If generic
is FALSE
, ignore generic functions.
showDefault
:Utility, used to enable show
methods to be called by the
automatic printing (via print.default
).
Argument oldMethods
controls whether old-style print
methods are used for this object. It is TRUE
by default
if called directly, but FALSE
when called from the
methods package for automatic printing (to avoid potential
recursion).
initMethodDispatch
:Turn on the internal method dispatch code. Called on attaching
the package. Also, if dispatch has been turned off (by calling
.isMethodsDispatchOn(FALSE)
—a very gutsy thing to do),
calling this function should turn dispatch back on again.
methodSignatureMatrix
:Returns a matrix with the contents of the specified slots as rows. The slots should be named character strings of the same length. Basically used to turn the signatures of a "MethodDefinition"
objectg into a matrix for printing.