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\title{Description of the Methods Defined for a Generic Function}
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\title{Description of the Methods Defined for a Generic Function}
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\description{
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\description{
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The function \code{findMethods} converts the methods defined in a table for a generic
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The function \code{findMethods} converts the methods defined in a table for a generic
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function (as used for selection of methods) into a list, for study or
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function (as used for selection of methods) into a list, for study or
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display. The list is actually from the class \code{listOfMethods}
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display. The list is actually from the class \code{listOfMethods}
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(see the section describing the class, below).
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(see the section describing the class, below).
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The list will be limited
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The list will be limited
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to the methods defined in environment \code{where} if that argument is
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to the methods defined in environment \code{where} if that argument is
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supplied and limited to those including one or more of the
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supplied and limited to those including one or more of the
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specified \code{classes} in the method signature if that argument is
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specified \code{classes} in the method signature if that argument is
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supplied.
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supplied.
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The function \code{findMethodSignatures} returns a character matrix
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The function \code{findMethodSignatures} returns a character matrix
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whose rows are the class names from the signature of the corresponding
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whose rows are the class names from the signature of the corresponding
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methods; it operates either from a list returned by
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methods; it operates either from a list returned by
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\code{findMethods}, or by computing such a list itself, given the same
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\code{findMethods}, or by computing such a list itself, given the same
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arguments as \code{findMethods} .
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arguments as \code{findMethods} .
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The function \code{hasMethods} returns \code{TRUE} or \code{FALSE}
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The function \code{hasMethods} returns \code{TRUE} or \code{FALSE}
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according to whether there is a non-empty table of methods for
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according to whether there is a non-empty table of methods for
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function \code{f} in the environment or search position \code{where}
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function \code{f} in the environment or search position \code{where}
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(or for the generic function generally if \code{where} is missing).
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(or for the generic function generally if \code{where} is missing).
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missing this will be inferred either from the \code{"package"}
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missing this will be inferred either from the \code{"package"}
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attribute of the function name, if any, or from the package slot of
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attribute of the function name, if any, or from the package slot of
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the generic function. See \sQuote{Details}.}
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the generic function. See \sQuote{Details}.}
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}
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}
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\details{
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\details{
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The functions obtain a table of the defined methods, either from the
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The functions obtain a table of the defined methods, either from the
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generic function or from the stored metadata object in the environment
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generic function or from the stored metadata object in the environment
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specified by \code{where}. In a call to \code{getMethods}, the information in the table is converted
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specified by \code{where}. In a call to \code{getMethods}, the information in the table is converted
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as described above to produce the returned value, except with the
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as described above to produce the returned value, except with the
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\code{table} argument.
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\code{table} argument.
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Note that \code{hasMethods}, but not the other functions, can be used
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Note that \code{hasMethods}, but not the other functions, can be used
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even if no generic function of this name is currently found. In this
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even if no generic function of this name is currently found. In this
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case \code{package} must either be supplied as an argument or included
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case \code{package} must either be supplied as an argument or included
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as an attribute of \code{f}, since the package name is part of the
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as an attribute of \code{f}, since the package name is part of the
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identification of the methods tables.
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identification of the methods tables.
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