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\alias{selectMethod}
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10 |
\alias{selectMethod}
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\alias{hasMethod}
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\alias{hasMethod}
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\title{ Get or Test for the Definition of a Method }
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\title{ Get or Test for the Definition of a Method }
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\description{
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\description{
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Functions to look for a method corresponding to a given generic function and signature.
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Functions to look for a method corresponding to a given generic function and signature.
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The functions \code{getMethod} and \code{selectMethod} return the method; the functions \code{existsMethod}
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The functions \code{getMethod} and \code{selectMethod} return the method; the functions
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and \code{hasMethod} test for its existence. In both
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16 |
\code{existsMethod} and \code{hasMethod} test for its existence. In both
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cases the first function only gets direct definitions and the second
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cases the first function only gets direct definitions and the second
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uses inheritance. In all cases, the search is in the generic function itself or in the package/environment specified by argument \code{where}.
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uses inheritance. In all cases, the search is in the generic function itself or in
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the package/environment specified by argument \code{where}.
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20 |
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The function \code{findMethod} returns the package(s) in the search
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The function \code{findMethod} returns the package(s) in the search
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list (or in the packages specified by the \code{where} argument) that
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list (or in the packages specified by the \code{where} argument) that
|
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contain a method for this function and signature.
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contain a method for this function and signature.
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}
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}
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existsMethod(f, signature = character(), where)
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existsMethod(f, signature = character(), where)
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30 |
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findMethod(f, signature, where)
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findMethod(f, signature, where)
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32 |
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selectMethod(f, signature, optional = FALSE, useInherited =,
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selectMethod(f, signature, optional = FALSE, useInherited =,
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mlist = , fdef = , verbose = , doCache = , returnAll =)
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mlist = , fdef = , verbose = , doCache = )
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hasMethod(f, signature=character(), where)
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hasMethod(f, signature=character(), where)
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}
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}
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\arguments{
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39 |
\arguments{
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method(s): by default, the table of methods defined in the generic function itself is used.}
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46 |
method(s): by default, the table of methods defined in the generic function itself is used.}
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47 |
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| 47 |
\item{optional}{If the selection in \code{selectMethod} does not find a valid method
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\item{optional}{If the selection in \code{selectMethod} does not find a valid method
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an error is generated, unless this argument is \code{TRUE}. In that
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49 |
an error is generated, unless this argument is \code{TRUE}. In that
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case, the value returned is \code{NULL} if no method matches.}
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case, the value returned is \code{NULL} if no method matches.}
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\item{mlist, fdef, useInherited, verbose, doCache, returnAll}{Optional
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\item{mlist, fdef, useInherited, verbose, doCache}{Optional
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| 51 |
arguments to \code{getMethod} and \code{selectMethod} for
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52 |
arguments to \code{getMethod} and \code{selectMethod} for
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| 52 |
internal use. Avoid
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53 |
internal use. Avoid
|
| 53 |
these: some will work as expected and others will not, and none of them is required for normal use of the functions.
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54 |
these: some will work as expected and others will not, and none of them is required for normal use of the functions.
|
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}
|
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}
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