initial commit

1 files changed, 53 insertions, 0 deletions

diff --git a/examples/arc.ct b/examples/arc.ct
new file mode 100644
index 0000000..8869b42
--- /dev/null
+++ b/examples/arc.ct
@@ -0,0 +1,53 @@
+/* could be non-null instead of raw pointer? */
+typedef atomic_rc [t any] {
+	count *usize;
+	data *t;
+}
+
+/* macros must be 'called' with () */
+pub define arc(t) { struct (atomic_rc[t]) };
+
+pub dereference(a *arc) *#a.data
+{
+	return a.t;
+}
+
+pub init(mut a *arc, e #a.data)
+{
+	new(a.count, 0);
+	a.data = e;
+}
+
+pub init(mut a *arc, b *arc<#a.data>)
+{
+	copy(a, b);
+}
+
+pub deinit(mut a *arc)
+{
+	if atomic_fetch_add(a.count, -1) == 1 {
+		dealloc(a.data);
+		dealloc(a.count);
+	}
+
+	a.count = null;
+	a.data = null;
+}
+
+pub copy(mut a *arc, b *arc<#a.data>)
+{
+	deinit(a);
+	a.count = b.count;
+	a.data = b.data;
+	atomic_fetch_add(b.count, 1);
+}
+
+pub move(mut a *arc, mut b *arc<#a.data>)
+{
+	deinit(a);
+	a.count = b.count;
+	a.data = b.data;
+	/* reference count stays the same */
+	b.count = null;
+	a.count = null;
+}