refactor iterators to be closure objects

This makes iterators much more flexible while keeping their abstract
nature. New iterators can be made by a programmer with different
methods.

Existing iterator types cannot be programatically extended. This
would likely require implementation support: either CLOS-style
classes or a more limited single-dispatch interface system.

1 files changed, 5 insertions, 5 deletions

diff --git a/mcgoron.iterator.base.sld b/mcgoron.iterator.base.sld
index 44507ae..dff81e0 100644
--- a/mcgoron.iterator.base.sld
+++ b/mcgoron.iterator.base.sld
@@ -16,13 +16,13 @@
 (define-library (mcgoron iterator base)
   (import (scheme base) (scheme case-lambda) (srfi 128)
           (mcgoron iterator exceptions))
-  (export make-iterator iterator?
+  (export iterator?
+          define-iterator-implementation
+          define-invocation
+          iterator-closure iterator-capabilities iterator-type
           iterator-at-start? iterator-at-end?
           iterator-advance
           iterator-ref
-          iterator->index
-          iterator-get-private
-          iterator=? iterator<? iterator>? iterator<=? iterator>=?
-          iteratively-apply-predicate)
+          iterator->index)
   (include "mcgoron.iterator.base.scm"))