Re: [vos-d] templates/macros
I went ahead and did it already, actually. I needed the template functionality in the core so that I could specify VOS classes that are logically templates, such as UInt8DynamicArrayProperty (which is a property holding an array of bytes). Without a template feature, I would have to do a lot of cut and paste to get DynamicStringArrayProperty, DynamicVector3ArrayProperty, etc... The current scheme is somewhat incomplete though, we will need listeners to be able to properly propagate changes in the base template to all the template instances. On Sat, Mar 01, 2008 at 02:14:00PM -0500, Reed Hedges wrote: Peter Amstutz wrote: The idea is to set up Template vobjects which have TemplateParameters which are stand-ins for links other objects and are substituted when you actually create a template instance. The TemplateInstance vobject links to the template and some set of parameters, and will have an instantiate method on it which produces a vobject structure with the appropriate parameter substitution. This is definitely something we need. It ought to be very straightforward to implement as a component type, using listeners. But let's not add any more tasks like this right now, let's get the VOS core working first (including listeners) Reed ___ vos-d mailing list vos-d@interreality.org http://www.interreality.org/cgi-bin/mailman/listinfo/vos-d -- [ Peter Amstutz ][ [EMAIL PROTECTED] [EMAIL PROTECTED] [Lead Programmer][Interreality Project][Virtual Reality for the Internet] [ VOS: Next Generation Internet Communication][ http://interreality.org ] [ http://interreality.org/~tetron ][ pgpkey: pgpkeys.mit.edu 18C21DF7 ] signature.asc Description: Digital signature ___ vos-d mailing list vos-d@interreality.org http://www.interreality.org/cgi-bin/mailman/listinfo/vos-d
[vos-d] templates/macros
Here's a quick brain dump of something I'm working on. The specific goal is deal with the problem of parameterized types. In this example, I show how one might define UInt8DynamicArrayProperty as a Property holding a DynamicArray of UInt8. The idea is to set up Template vobjects which have TemplateParameters which are stand-ins for links other objects and are substituted when you actually create a template instance. The TemplateInstance vobject links to the template and some set of parameters, and will have an instantiate method on it which produces a vobject structure with the appropriate parameter substitution. Nothing coded yet, so this will likely change. Incidentally, this is actually fairly similar to the template system coded for the original hypervos (which runs parts of interreality.org) so this idea of generalized subtree substitution is likely to be useful beyond the specific problem I'm trying to solve. vobject name=Property type=/vos/core/Template vobject name=produces linkTo=/vos/core/Class / vobject name=propertyType type=/vos/core/TemplateParameter / child name=extends type=/vos/core/Component / vobject name=value type=/vos/core/Member child name=param linkTo=../../propertyType / /vobject /vobject vobject name=DynamicArrayProperty type=/vos/core/Template child name=extendsTemplate linkTo=/vos/core/Property / vobject name=memberType type=/vos/core/TemplateParameter / vobject name=propertyType type=/vos/core/DynamicArray child name=memberType linkTo=../../memberType / /vobject vobject name=size type=/vos/core/Member child name=type linkTo=/vos/core/UInt32 / property name=readOnly type=/vos/core/BooleanPropertytrue/property /vobject vobject name=getSlice type=/vos/core/Method vobject name=formalParameters type=/vos/core/Struct vobject name=start type=/vos/core/Member child name=type linkTo=/vos/core/UInt32 / /vobject vobject name=length type=/vos/core/Member child name=type linkTo=/vos/core/UInt32 / /vobject /vobject child name=returnType linkTo=../../../propertyType / /vobject /vobject vobject name=UInt8Property type=/vos/core/TemplateInstance child name=template linkTo=/vos/core/Property / child name=propertyType linkTo=/vos/core/UInt8 / /vobject vobject name=UInt8DynamicArrayProperty type=/vos/core/TemplateInstance child name=template linkTo=/vos/core/DynamicArrayProperty / child name=memberType linkTo=/vos/core/UInt8 / /vobject -- [ Peter Amstutz ][ [EMAIL PROTECTED] [EMAIL PROTECTED] [Lead Programmer][Interreality Project][Virtual Reality for the Internet] [ VOS: Next Generation Internet Communication][ http://interreality.org ] [ http://interreality.org/~tetron ][ pgpkey: pgpkeys.mit.edu 18C21DF7 ] signature.asc Description: Digital signature ___ vos-d mailing list vos-d@interreality.org http://www.interreality.org/cgi-bin/mailman/listinfo/vos-d
