[PD] data structure setsize allocation

Jonathan Wilkes jancsika at yahoo.com
Tue Nov 11 18:28:04 CET 2014

One amorphous question:

With my canvas field, I can keep track of the canvas associated with a scalar by getting a pointer to that scalar (or to an array).

But inside that canvas itself, how would I find/generate a gpointer to the scalar (or array) that's associated with me?  I was thinking about pd_bind, but the fact that the t_word might be inside an array seems like it complicates things a bit.
With such an association that canvas could, for example, sample a tilde object's output and use that to set the "y" field for the associated scalar.  Then you could create a scalar and have it animate itself while outputting audio, all without having to traverse a glist.


On Tuesday, November 11, 2014 12:01 PM, Miller Puckette <msp at ucsd.edu> wrote:

Sure enough... thanks.


On Mon, Nov 10, 2014 at 06:16:47PM -0800, Jonathan Wilkes via Pd-list wrote:
> Hi Miller,
>      I think there may be a memory leak regarding [setsize] and your new text field.  The user is initializing and potentially populating many t_binbufs through word_init after they enlarge an array with [setsize].  But if they set a smaller size with [setsize] it doesn't look like you are freeing those t_binbufs.
> I noticed this while reworking your old DT_LIST field to create canvases as data fields.  I do [struct test canvas foo bar], which reads an abstraction name bar.pd (if it exists) into a binbuf associated with the corresponding struct.  Then when I create a scalar, it evaluates that t_binbuf which creates a hidden toplevel "bar.pd" canvas.  The fun comes when using the "canvas foo bar" field in a template for an array field-- then I can use [setsize] to create a massive number of abstractions at once.  But when I decrease the array size my abstractions linger until I "vis" them and close them.
> So I'm guessing it's the same problem with DT_TEXT, no?
> -Jonathan

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