These functions create and manipulate
MethodsList objects, the
objects formerly used in R to store methods for dispatch. Use of
these objects is deprecated since R 3.2.0, as it will rarely be a
good idea. Where methods dispatch is
to be studied, see
selectMethod. For computations
that iterate over methods or over method signatures, see
findMethods, which returns a linearized methods list
to hold method definitions, usually more convenient for iteration
than the recursive
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listFromMlist(mlist, prefix = list(), sigs. = TRUE, methods. = TRUE) linearizeMlist(mlist, inherited = TRUE) finalDefaultMethod(method) loadMethod(method, fname, envir) ##--------- These are all deprecated, since R 3.2.0 ---------- MethodsList(.ArgName, ...) makeMethodsList(object, level=1) SignatureMethod(names, signature, definition) insertMethod(mlist, signature, args, def, cacheOnly) inheritedSubMethodLists(object, thisClass, mlist, ev) showMlist(mlist, includeDefs = TRUE, inherited = TRUE, classes, useArgNames, printTo = stdout() ) ## S3 method for class 'MethodsList' print(x, ...) mergeMethods(m1, m2, genericLabel)
Undo the recursive nature of the methods list, making a list of
list(sigs,methods)of function definitions, i.e. of matching signatures and methods.
prefixis the partial signature (a named list of classes) to be prepended to the signatures in this object. If
FALSE, the resulting part of the return value will be empty.
A utility function used to iterate over all the individual methods in the object, it calls itself recursively.
Undo the recursive nature of the methods list, making a list of function definitions, with the names of the list being the corresponding signatures.
Designed for printing; for looping over the methods, use the above
The default method or NULL. With the demise of
"MethodsList"objects, this function only checks that the value given it is a method definition, primitive or NULL.
Called, if necessary, just before a call to
methodis dispatched in the frame
envir. The function exists so that methods can be defined for special classes of objects. Usually the point is to assign or modify information in the frame environment to be used evaluation. For example, the standard class
MethodDefinitionhas a method that stores the target and defined signatures in the environment. Class
MethodWithNexthas a method taking account of the mechanism for storing the method to be used in a call to
Any methods defined for
loadMethodmust return the function definition to be used for this call; typically, this is just the
Chambers, John M. (2008) Software for Data Analysis: Programming with R Springer. (For the R version.)
Chambers, John M. (1998) Programming with Data Springer (For the original S4 version.)
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