Re: C-style expression processing...

From: Divacky Roman (xdivac02_at_stud.fit.vutbr.cz)
Date: 04/25/05

  • Next message: Bruce M Simpson: "Re: preadv() / pwritev()" 
    Date: Mon, 25 Apr 2005 19:56:35 +0200
To: Ron Chen <ron_chen_123@yahoo.com>

    On Sun, Apr 24, 2005 at 10:50:16PM -0700, Ron Chen wrote:
    > Hi,
    >
    > I am trying to add a new feature in Gridengine
    > (free/opensource) to support ex-LSF users - there are
    > more and more LSF users migrating to Gridengine), and
    > some requested this one:
    >
    > In LSF, a user can specify from the command line the
    > resource requirements of a batch job:
    >
    > (mem >= 100 || pg < 200.0)
    >
    > Where mem and pg are variables (they changes in time,
    > and the master cluster scheduler has the most
    > up-to-date information). And what I need is to find
    > out whether the expression is true or not.
    >
    > My question is, is there an expression processing
    > library that can handle complex equations easily?

    you can easily parse it, using yacc/lex... and even hand-writing such parser
    cannot be difficult..
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