From e57c18156cf11aaeae89e66828811c9fcc42fa81 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Sun, 29 Aug 2021 18:44:55 +0100
Subject: Mutable references

---
 src/ffi.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/ffi.js')

diff --git a/src/ffi.js b/src/ffi.js
index d3ee8ce..d7b6bf9 100644
--- a/src/ffi.js
+++ b/src/ffi.js
@@ -98,3 +98,23 @@ export function map_promise(promise, fn) {
 export function rescue(promise, fn) {
   return promise.catch((error) => fn(error));
 }
+
+class Reference {
+  constructor(value) {
+    this.value = value;
+  }
+}
+
+export function dereference(reference) {
+  return reference.value;
+}
+
+export function make_reference(value) {
+  return new Reference(value);
+}
+
+export function set_reference(ref, value) {
+  let previous = ref.value;
+  ref.value = value;
+  return previous;
+}
-- 
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