1 files changed, 63 insertions, 0 deletions
diff --git a/src/refl.zig b/src/refl.zig
new file mode 100644
index 0000000..3dd851f
--- /dev/null
+++ b/src/refl.zig
@@ -0,0 +1,63 @@
+const std = @import("std");
+
+fn A(comptime T: type) type {
+    const ti = @typeInfo(T).@"struct";
+
+    var names: [ti.fields.len + ti.decls.len][]const u8 = undefined;
+    var types: [ti.fields.len + ti.decls.len]type = undefined;
+    var attrs: [ti.fields.len + ti.decls.len]std.builtin.Type.StructField.Attributes = undefined;
+
+    inline for (ti.fields, 0..) |field, idx| {
+        names[idx] = field.name;
+        types[idx] = extern struct {
+            value: field.type,
+            pub fn get(self: @This()) field.type {
+                std.debug.print("getting {s}\n", .{field.name});
+                return self.value;
+            }
+            pub fn set(self: @This(), value: field.type) void {
+                std.debug.print("setting {s}\n", .{field.name});
+                self.value = value;
+            }
+        };
+        const default = if (field.default_value_ptr) |def| types[idx] {.value = @as(*field.type, @constCast(@ptrCast(@alignCast(def)))).*} else null;
+        attrs[idx] = .{
+            .@"comptime" = field.is_comptime,
+            .@"align" = field.alignment,
+            .default_value_ptr = &default,
+        };
+    }
+    inline for (ti.decls, 0..) |decl, idx| {
+        const default = struct {
+            pub fn call() void {
+                std.debug.print("calling {s}\n", .{decl.name});
+                @call(.auto, @field(T, decl.name), .{});
+                std.debug.print("done calling {s}\n", .{decl.name});
+            }
+        };
+        names[ti.fields.len + idx] = decl.name;
+        types[ti.fields.len + idx] = type;
+        attrs[ti.fields.len + idx] = .{.default_value_ptr = &default};
+    }
+
+    return @Struct(.auto, null, &names, &types, &attrs);
+}
+
+pub fn main() !void {
+    const a = A(struct {
+        i: i32 = 123,
+        j: i32 = 456,
+        pub fn b() void {
+            std.debug.print("B!\n", .{});
+        }
+        pub fn c() void {
+            std.debug.print("C!\n", .{});
+        }
+    }) {};
+    std.debug.print("[{}] {}\n", .{@TypeOf(a), a});
+    a.b.call();
+    a.c.call();
+    std.debug.print("{}\n", .{a.i.get()});
+    std.debug.print("{}\n", .{a.j.get()});
+}
+