bug#18494: 24.4.50; defclass creates undocumented *-list-p function

[Eric Ludlam]

On Sun, Sep 21, 2014 at 12:20 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> EIEIO will need to remove it's local copy of an old typep, and I could
> certainly convert over to using something list (list foo).  I use
> those predicates mostly with typep.

Could someone explain (and show) to me in detail how/where these
foo-list-p are used in relation to EIEIO?

Sure, in ede/base.el, you will find these lines:

(defclass ede-project (ede-project-placeholder)

  ((subproj :initform nil

   :type list

   :documentation "Sub projects controlled by this project.

For Automake based projects, each directory is treated as a project.")

   (targets :initarg :targets

   :type ede-target-list

   :custom (repeat (object :objectcreatefcn ede-new-target-custom))

   :label "Local Targets"

   :group (targets)

   :documentation "List of top level targets in this project.")

for "targets: you will see:

:type ede-target-list

which will expand to ede-target-list-p, which is a test for a list of type ede-target.

This also occurs semantic/db.e which tracks a list of tables, and in cogre.el, where the graph tracks a list of graph elements.

Eric