S3Part
S4 Classes that Contain S3 Classes

### Description

Accesses an S3 object contained within an S4 object.

### Usage

    S3Part(object, strictS3 = FALSE, S3Class)
    S3Part(object, strictS3 = FALSE, needClass = .S3Class(object)) <- value

### Arguments

object | an object.
strictS3 | a logical value. If TRUE, then when S3Part extracts from an object extending oldClass, it clears the S4 flag for the returned value (see isS4).
S3Class | a string vector. If this argument is specified, it is set as the class of the object returned by S3Part.
needClass | a string vector. If object extends oldClass, S3Part<- checks if value extends this class.
value | an object, inserted as the S3 object contained in object.

### Details

An S4 object is considered to contain an S3 object if its class contains a basic vector class, or a class defined with setOldClass, or a subclass of these.

| S3Part | extracts the S3 object from such an S4 object. If object is not an S4 object, it is simply returned.
| S3Part<- | modifies the S3 object within such an S4 object. If object is not an S4 object, it just returns value

Value

S3Part | returns the S3 object extracted from an S4 object.
S3Part<- | returns the modified object.

See Also
setOldClass, isS4.
Examples

    setClass("myClass", list(x="character"), contains="integer")
    xx <- new("myClass", 123L, x="abc")
    S3Part(xx)
    ## [1] 123
    S3Part(xx) <- 456L
    xx
    ## An object of class "myClass"
    ## [1] 456
    ## Slot "x":
    ## [1] "abc"

Package methods version 6.1.5-18
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