From 4c3a35bc952e7780553ba2ac73e4baf3f2134ba3 Mon Sep 17 00:00:00 2001
From: Michele Caini <michele.caini@gmail.com>
Date: Tue, 3 Oct 2023 14:49:04 +0200
Subject: [PATCH] storage: make get_allocator work with void type

---
 src/entt/entity/storage.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/entt/entity/storage.hpp b/src/entt/entity/storage.hpp
index 6a76f5e3a..925e05865 100644
--- a/src/entt/entity/storage.hpp
+++ b/src/entt/entity/storage.hpp
@@ -841,7 +841,12 @@ public:
      * @return The associated allocator.
      */
     [[nodiscard]] constexpr allocator_type get_allocator() const noexcept {
-        return allocator_type{base_type::get_allocator()};
+        // std::allocator<void> has no cross constructors (waiting for C++20)
+        if constexpr(std::is_same_v<value_type, void> && !std::is_constructible_v<allocator_type, typename base_type::allocator_type>) {
+            return allocator_type{};
+        } else {
+            return allocator_type{base_type::get_allocator()};
+        }
     }
 
     /**