Clang couldn't deduce template argument on macOS

Author: wravery

samples/star_wars/DroidData.cpp

@@ -32,7 +32,8 @@ void Droid::addFriends(
 		[](const auto& spFriend) noexcept {
 			return std::visit(
 				[](const auto& hero) noexcept {
-					return WeakHero { std::weak_ptr { hero } };
+					return WeakHero { std::weak_ptr<std::decay_t<decltype(hero)>::element_type> {
+						hero } };
 				},
 				spFriend);
 		});

samples/star_wars/HumanData.cpp

@@ -31,7 +31,8 @@ void Human::addFriends(std::vector<SharedHero> friends) noexcept
 		[](const auto& spFriend) noexcept {
 			return std::visit(
 				[](const auto& hero) noexcept {
-					return WeakHero { std::weak_ptr { hero } };
+					return WeakHero { std::weak_ptr<std::decay_t<decltype(hero)>::element_type> {
+						hero } };
 				},
 				spFriend);
 		});