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\alias{NULL-class}
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\alias{NULL-class}
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\alias{function-class}
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\alias{function-class}
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\alias{ANY-class}
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\alias{ANY-class}
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\alias{VIRTUAL-class}
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\alias{VIRTUAL-class}
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\alias{missing-class}
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\alias{missing-class}
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\alias{S4-class}
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\title{Classes Corresponding to Basic Data Types }
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\title{Classes Corresponding to Basic Data Types }
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\description{
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\description{
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  Formal classes exist corresponding to the basic R data types, allowing
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  Formal classes exist corresponding to the basic R object types, allowing
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  these types to be used in method signatures, as slots in class
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  these types to be used in method signatures, as slots in class
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  definitions, and to be extended by new classes.}
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  definitions, and to be extended by new classes.}
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\usage{
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\usage{
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### The following are all basic vector classes.
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### The following are all basic vector classes.
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### They can appear as class names in method signatures,
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### They can appear as class names in method signatures,
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### the class
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### the class
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"vector"
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"vector"
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### is a virtual class, extended by all the above
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### is a virtual class, extended by all the above
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### the class
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"S4"
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### is an object type for S4 objects that do not extend
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### any of the basic vector classes.  It is a virtual class.
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### The following are additional basic classes
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### The following are additional basic classes
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"NULL"     #  NULL objects
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"NULL"     #  NULL objects
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"function" #  function objects, including primitives
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"function" #  function objects, including primitives
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"externalptr" # raw external pointers for use in C code
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"externalptr" # raw external pointers for use in C code
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