Function

Summary

Returns the current generation number for an object.

Package

system

Signature

generation-number object => integer

Arguments

object

A Lisp object.

Values

integer

An integer.

Description

The function generation-number returns the generation number in which the Lisp object object currently is. See the discussion in Storage Management.

If object is an immediate object then generation-number returns -1. Immediates are objects which are not allocated, including fixnums, characters and short floats, and single floats in 64-bit LispWorks.