From: Stefan Rusterholz <apeiros@...>
Date: 2009-01-29T09:03:04+09:00
Subject: Re: Bitwise question

Andrew Barringer wrote:
> I'm working on a project that has a bitmap of permissions and I need to
> find out if a user has access.
> 
> 
> 
> Given permissions bit mask of 0001C0200F02000000000 where each bit
> represents a specific permission
> 
> 
> 
> And a request for permissions check on bits [37, 12, 48]
> 
> 
> 
> What's the best way to find out if user has access to all requested
> permissions?

Whatever 'best' is supposed to mean. Here is one way:

requested_bits.all? { |bit| permissions[bit] == 1 }

Regards
Stefan
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