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\section{Implementation Details}{
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\section{Implementation Details}{
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  Methods dispatching on \dQuote{\dots} were introduced in version 2.8.0 of
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  Methods dispatching on \dQuote{\dots} were introduced in version 2.8.0 of
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  \R.  The initial implementation of the corresponding selection and
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  \R.  The initial implementation of the corresponding selection and
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  dispatch is in an R function, for flexibility while the new
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  dispatch is in an R function, for flexibility while the new
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  mechanism is being studied.  In this implementation, a local version
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  mechanism is being studied.  In this implementation, a local version
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  of \code{setGeneric} is inserted in the generic function's
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  of \code{standardGeneric} is inserted in the generic function's
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  environment.  The local version selects a method according to the
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  environment.  The local version selects a method according to the
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  criteria above and calls that method, from the environment of the
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  criteria above and calls that method, from the environment of the
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  generic function.  This is slightly different from the action taken
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  generic function.  This is slightly different from the action taken
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  by the C implementation when \dQuote{\dots} is not involved.  Aside from the
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  by the C implementation when \dQuote{\dots} is not involved.  Aside from the
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  extra computing time required, the method is evaluated in a true
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  extra computing time required, the method is evaluated in a true