classVersion {Biobase} | R Documentation

## Retrieve information about versioned classes

### Description

These generic functions return version information for classes derived from `Versioned-class`, or `VersionsNull-class` for unversioned objects. The version information is an object of `Versions-class`.

By default, `classVersion` has the following behaviors:

`classVersion(Versioned-instance)`
  Returns a `Versions-class` object obtaine from the object.
`classVersion{"class"}`
  Consults the definition of `class` and return the current version information, if available.
`classVersion(ANY)`
  Return a `VersionsNull-class` object to indicate no version information available.

By default, the `classVersion<-` method has the following behavior:

`classVersion(Versioned-instance)["id"] <- value`
  Assign (update or add) `value` to `Versions-instance`. `value` is coerced to a valid version description. see `Versions-class` for additional access methods.

### Usage

    classVersion(object)
    classVersion(object) <- value

### Arguments

`object` | Object whose version is to be determined, as described above.
`value` | `Version-class` object to assign to object of `Versioned-class` object.

### Value

`classVersion` returns an instance of `Versions-class`

### Author(s)

Biocore team

### See Also

`Versions-class`

### Examples

    obj <- new("VersionedBiobase")

    classVersion(obj)
    classVersion(obj)["Biobase"]
    classVersion(1:10) # no version
    classVersion("ExpressionSet") # consult ExpressionSet prototype

    classVersion(obj)["MyVersion"] <- "1.0.0"
    classVersion(obj)

[Package Biobase version 2.2.2 Index]