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functions as described in the section on \dQuote{Reference Objects}.
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functions as described in the section on \dQuote{Reference Objects}.
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}
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}
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} %% end of \describe
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} %% end of \describe
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} %% end of \section
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} %% end of \section
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\section{Implementation; Reference Classes as S4 Classe}{
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\section{Implementation; Reference Classes as S4 Classes}{
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Reference classes are implemented as S4 classes with a data part of
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Reference classes are implemented as S4 classes with a data part of
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type \code{"environment"}.
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type \code{"environment"}.
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Fields correspond to named objects in the environment.
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Fields correspond to named objects in the environment.
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A field associated with a function is implemented as an
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A field associated with a function is implemented as an
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\link[=bindenv]{active binding}.
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\link[=bindenv]{active binding}.