From dfeded73f45229558693e227bc1c9f52102ea0af Mon Sep 17 00:00:00 2001
From: Dominik Laskowski <domlaskowski@google.com>
Date: Tue, 15 Nov 2022 16:53:53 -0500
Subject: FTL: Add mixins for type-safe wrappers

For now, allow mixing in construction, default construction, equality,
ordering, incrementing, and addition.

Bug: 185536303
Test: ftl_test
Change-Id: I9017e124656ba0e7f13f378814c5b1c19a36655b
---
 include/ftl/enum.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'include/ftl/enum.h')

diff --git a/include/ftl/enum.h b/include/ftl/enum.h
index 82af1d6cf8..075d12bd17 100644
--- a/include/ftl/enum.h
+++ b/include/ftl/enum.h
@@ -92,7 +92,7 @@ inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
 //   enum class E { A, B, C };
 //   static_assert(ftl::to_underlying(E::B) == 1);
 //
-template <typename E>
+template <typename E, typename = std::enable_if_t<std::is_enum_v<E>>>
 constexpr auto to_underlying(E v) {
   return static_cast<std::underlying_type_t<E>>(v);
 }
-- 
cgit v1.2.3-59-g8ed1b