feat(List)

src/iterators/Forward.js

@@ -0,0 +1,35 @@
+import { satisfiesConcept } from "../utils/concept"
+
+export class ForwardIterator {
+  move(rhs) {
+    return this.copy(rhs)
+  }
+
+  get value() {
+    return this.deref().value
+  }
+
+  set value(value) {
+    return this.deref().value = value
+  }
+
+  neq(rhs) {
+    return !this.eq(rhs)
+  }
+}
+
+ForwardIterator.is = function (obj, ...args) {
+  const pure_virtual = [
+    'clone',
+    'copy',
+    'deref',
+    'inc',
+    'eq'
+  ]
+  const virtual = [
+    'move',
+    'value',
+    'neq',
+  ]
+  return satisfiesConcept(obj, pure_virtual, virtual, ...args)
+}