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+;;; obarray.el --- obarray functions -*- lexical-binding: t -*-
+
+;; Copyright (C) 2015 Free Software Foundation, Inc.
+
+;; Maintainer: emacs-devel@gnu.org
+;; Keywords: obarray functions
+;; Package: emacs
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file provides function for working with obarrays.
+
+;;; Code:
+
+(defconst obarray-default-size 59
+  "The value 59 is an arbitrary prime number that gives a good hash.")
+
+(defun obarray-make (&optional size)
+  "Return a new obarray of size SIZE or `obarray-default-size'."
+  (let ((size (or size obarray-default-size)))
+    (if (< 0 size)
+        (make-vector size 0)
+      (signal 'wrong-type-argument '(size 0)))))
+
+(defun obarray-p (object)
+  "Return t if OBJECT is an obarray."
+  (and (vectorp object)
+       (< 0 (length object))))
+
+(defun obarray-get (obarray name)
+  "Return symbol named NAME if it is contained in OBARRAY.
+Return nil otherwise."
+  (intern-soft name obarray))
+
+(defun obarray-put (obarray name)
+  "Return symbol named NAME from OBARRAY.
+Creates and adds the symbol if doesn't exist."
+  (intern name obarray))
+
+(defun obarray-remove (obarray name)
+  "Remove symbol named NAME if it is contained in OBARRAY.
+Return t on success, nil otherwise."
+  (unintern name obarray))
+
+(defun obarray-foreach (fn obarray)
+  "Call function FN on every symbol in OBARRAY and return nil."
+  (mapatoms fn obarray))
+
+(provide 'obarray)
+;;; obarray.el ends here