Merge pull request #160 from TypeCombinator/master

Solution to 356.md
tip-of-the-week · Nov 25, 2024 · 3ead9cc · 3ead9cc
2 parents 697f1db + 2a19b81
commit 3ead9cc
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/tips/356.md b/tips/356.md
@@ -85,4 +85,22 @@ constexpr auto is_unique = sizeof(S<Ts...>) == 1;
 
 > https://godbolt.org/z/rM5q93WEh
 
+```cpp
+template <typename T>
+struct empty_wrap { };
+
+template <typename T, typename = decltype([]() {})>
+struct unique_empty_box {
+    [[no_unique_address]] empty_wrap<T> e;
+};
+
+template <typename... Ts>
+struct empty_type_pack : public unique_empty_box<Ts>... { };
+
+template <typename... Ts>
+constexpr bool is_unique = sizeof(empty_type_pack<Ts...>) == 1;
+```
+
+> https://godbolt.org/z/1h44G3fKa
+
 </p></details>