From: Robert Klemme <shortcutter@...>
Date: 2007-05-23T20:35:13+09:00
Subject: Re: storing boolean flags in numbers

On 23.05.2007 13:16, Sebastian probst Eide wrote:
>> p 5[2]
> Wow! This is great! But is there a way to set flags this way to?
> 
> Say I have:
> flags = 0b010110010
> 
> checking flag 6 is easy enough
> flags[6] => 0
> But how could I easily set flag 6 to 1?
> flags[6] = 1 doesn't work obviously...

Set and reset:

irb(main):001:0> flags = 0b010110010
=> 178
irb(main):002:0> flags[6]
=> 0
irb(main):003:0> flags |= 1 << 6
=> 242
irb(main):004:0> flags[6]
=> 1
irb(main):005:0> flags ^= flags[6] << 6
=> 178
irb(main):006:0> flags[6]
=> 0

See also http://raa.ruby-lang.org/project/bitset/

Kind regards

	robert