NAME
    ishash - whether a value is a hash state

SYNOPSIS
    ishash(x)

TYPES
    x		any

    return	integer

DESCRIPTION
    The value returned by ishash(x) is:

	0 if x is not a hash state,
	2 if x is a sha1 hash state,

EXAMPLE
    ; a = 1; b = sha1(0); c = sha1(a)
    ; print ishash(0), ishash(a), ishash(b), ishash(c), ishash(sha1(a))
    0 0 2 2 2

LIMITS
    none

LINK LIBRARY
    none

SEE ALSO
    isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
    isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
    isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
    issimple, issq, isstr, istype, sha1

## Copyright (C) 1999-2007  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL.  You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## @(#) $Revision: 30.2 $
## @(#) $Id: ishash,v 30.2 2007/07/05 17:37:41 chongo Exp $
## @(#) $Source: /usr/local/src/bin/calc/help/RCS/ishash,v $
##
## Under source code control:	1995/11/11 05:09:41
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
