nodelist: implement iterators

src/iterator/iterator.zig

@@ -0,0 +1,35 @@
+const std = @import("std");
+
+const generate = @import("../generate.zig");
+
+pub const Interfaces = generate.Tuple(.{
+    U32Iterator,
+});
+
+pub const U32Iterator = struct {
+    pub const mem_guarantied = true;
+
+    length: u32,
+    index: u32 = 0,
+
+    pub const Return = struct {
+        value: u32,
+        done: bool,
+    };
+
+    pub fn _next(self: *U32Iterator) !Return {
+        const i = self.index;
+        if (i >= self.length) {
+            return Return{
+                .value = 0,
+                .done = true,
+            };
+        }
+
+        self.index += 1;
+        return Return{
+            .value = i,
+            .done = false,
+        };
+    }
+};