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Diffstat (limited to 'src/clojure/contrib/macros.clj')
| -rw-r--r-- | src/clojure/contrib/macros.clj | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/clojure/contrib/macros.clj b/src/clojure/contrib/macros.clj new file mode 100644 index 00000000..7d2cc642 --- /dev/null +++ b/src/clojure/contrib/macros.clj @@ -0,0 +1,25 @@ +;; Various useful macros + +;; Copyright (c) Konrad Hinsen, 2009. All rights reserved. The use +;; and distribution terms for this software are covered by the Eclipse +;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) +;; which can be found in the file epl-v10.html at the root of this +;; distribution. By using this software in any fashion, you are +;; agreeing to be bound by the terms of this license. You must not +;; remove this notice, or any other, from this software. + +(ns clojure.contrib.macros) + +(defmacro const + "Evaluate the constant expression expr at compile time." + [expr] + (eval expr)) + +(defmacro letfn + "A variant of let for local function definitions. fn-bindings consists + of name/args/body triples, with (letfn [name args body] ...) + being equivalent to (let [name (fn name args body)] ...)." + [fn-bindings exprs] + (let [makefn (fn [[name args body]] (list name (list 'fn name args body))) + fns (vec (apply concat (map makefn (partition 3 fn-bindings))))] + `(let ~fns ~exprs))) |