From 081f21d7b99764305f3025bb007c7caf2c2422ef Mon Sep 17 00:00:00 2001
From: Meghan Denny <hello@nektro.net>
Date: Sun, 28 Jan 2024 22:02:23 -0800
Subject: [PATCH] add expectSimilarType

---
 src/expectSimilarType.zig | 39 +++++++++++++++++++++++++++++++++++++++
 src/lib.zig               |  1 +
 2 files changed, 40 insertions(+)
 create mode 100644 src/expectSimilarType.zig

diff --git a/src/expectSimilarType.zig b/src/expectSimilarType.zig
new file mode 100644
index 0000000000000000000000000000000000000000..2eaa6f8434c92a2859cfbde996bb6da6b0be44a4
--- /dev/null
+++ b/src/expectSimilarType.zig
@@ -0,0 +1,39 @@
+const std = @import("std");
+const string = []const u8;
+const extras = @import("./lib.zig");
+
+pub fn expectSimilarType(comptime A: type, comptime B: type) !void {
+    const info_a = @typeInfo(A);
+    const info_b = @typeInfo(B);
+    try std.testing.expect(std.meta.activeTag(info_a) == std.meta.activeTag(info_b));
+
+    if (info_a == .Struct) {
+        const info_a_s = info_a.Struct;
+        const info_b_s = info_b.Struct;
+
+        try std.testing.expect(info_a_s.layout == info_b_s.layout);
+        try std.testing.expect(info_a_s.is_tuple == info_b_s.is_tuple);
+        try std.testing.expect(info_a_s.backing_integer == info_b_s.backing_integer);
+
+        for (info_a_s.decls, info_b_s.decls) |da, db| {
+            try std.testing.expect(std.mem.eql(u8, da.name, db.name));
+        }
+
+        inline for (info_a_s.fields, info_b_s.fields) |fa, fb| {
+            try std.testing.expect(std.mem.eql(u8, fa.name, fb.name));
+            try std.testing.expect(fa.type == fb.type);
+            try std.testing.expect(fa.alignment == fb.alignment);
+            try std.testing.expect(fa.is_comptime == fb.is_comptime);
+        }
+
+        return;
+    }
+    @compileError("not implemented");
+}
+
+test {
+    try expectSimilarType(
+        struct { a: u32, b: u8, c: u16 },
+        struct { a: u32, b: u8, c: u16 },
+    );
+}
diff --git a/src/lib.zig b/src/lib.zig
index a5de6d29cadf24c7e2b890d528509eae6a419279..a268bc277ba4242f35008b74382ab647097c5ed9 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -88,3 +88,4 @@ pub fn fd_realpath(fd: std.os.fd_t) ![std.fs.MAX_PATH_BYTES:0]u8 {
 }
 
 pub usingnamespace @import("./rawInt.zig");
+pub usingnamespace @import("./expectSimilarType.zig");
-- 
2.54.0