[Xcb] XML-XCB: language-neutral bit constants

[Ian Osgood]

On Mar 14, 2006, at 10:56 AM, Jeremy A. Kolb wrote:

> On Tue, 14 Mar 2006, Ian Osgood wrote:
>
>>
>>> From: Ian Osgood <iano at quirkster.com>
>>>
>>> (BTW: I'd like to try my hand at this XSLT stuff with a better
>>> construct
>>> for bitmask constants.
>>
>> I came up with <bit bit="n"/>, which replaces:
>>
>> <op op="&lt;&lt;"><value>1</value><value>n</value></op>
>>
>> Unless there are objections, I'll push my changes to xproto.xml,
>> xcb.xsd, and c-client.xsl.
>>
>> Ian
>>
>>
>
> Are you replacing the op tag?  Because that's a bad idea.
>
> I would change that to lbit or something since i may be possible to  
> shift
> right as well.
>
> Jeremy

I'm adding a convenience function for one usage of the op="&lt;&lt;"  
tag (see above).   <op> itself is unmodified.  I realize that  
changing the name of operators &amp; and &lt;&lt; would result in  
lots of breakage in the extensions.  I like your idea of renaming  
them, though.  :)

<bit> is for addressing a bit in a word.  The C idiom is (1<<n), but  
other languages name this "shl(1,n)" or have built in bit addressing  
syntax (Pascal, Modula, and Oberon's sets for instance).

This is in preparation for moving constants from X.h to enumerations  
in xproto.xml.

Ian