vector math experiments

box.zig

@@ -0,0 +1,29 @@
+const std = @import("std");
+
+pub fn Box(comptime T: type) type {
+    return struct {
+        val: T,
+    };
+}
+
+pub fn AddBoxType(comptime LHS: type, comptime RHS: type) type {
+    const x = std.mem.zeroes(std.meta.FieldType(LHS, .val));
+    const y = std.mem.zeroes(std.meta.FieldType(RHS, .val));
+    return Box(@TypeOf(x + y));
+}
+
+pub fn addbox(lhs: anytype, rhs: anytype) AddBoxType(@TypeOf(lhs), @TypeOf(rhs)) {
+    return .{ .val = lhs.val + rhs.val };
+}
+
+test {
+    std.testing.refAllDecls(@This());
+}
+
+test "widen" {
+    const foo: Box(u8) = .{ .val = 99 };
+    const bar: Box(u16) = .{ .val = 599 };
+    const actual = addbox(foo, bar);
+    const expected: Box(u16) = .{ .val = 698 };
+    try std.testing.expectEqual(expected, actual);
+}