isClass
Test for a Class

### Description

Tests if the specified character string corresponds to a currently-defined class.

### Usage

    isClass(Class, formal = TRUE, where = topenv(parent.frame()))

### Arguments

Class | a character string defining the class.
formal | this argument is unimplemented, and a warning is generated if it is given.
where | this argument is unimplemented, and a warning is generated if it is given.

Value
returns a logical value. If TRUE, Class corresponds to a currently-defined class.
See Also
getClassDef
Examples

    isClass("numeric")  # TRUE - this class is always defined
    isClass("undefined-class")  # FALSE

Package methods version 6.1.5-18
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