Squashed 'external/entt/entt/' content from commit fef92113

git-subtree-dir: external/entt/entt
git-subtree-split: fef921132cae7588213d0f9bcd2fb9c8ffd8b7fc

test/entt/common/basic_test_allocator.hpp

@@ -0,0 +1,32 @@
+#ifndef ENTT_COMMON_BASIC_TEST_ALLOCATOR_HPP
+#define ENTT_COMMON_BASIC_TEST_ALLOCATOR_HPP
+
+#include <memory>
+#include <type_traits>
+
+namespace test {
+
+template<typename Type, typename Pocs = std::true_type>
+struct basic_test_allocator: std::allocator<Type> {
+    // basic pocca/pocma/pocs allocator
+
+    using base = std::allocator<Type>;
+    using propagate_on_container_copy_assignment = std::true_type;
+    using propagate_on_container_swap = Pocs;
+
+    using std::allocator<Type>::allocator;
+
+    basic_test_allocator &operator=(const basic_test_allocator &other) {
+        // necessary to avoid call suppression
+        base::operator=(other);
+        return *this;
+    }
+
+    bool operator==(const basic_test_allocator &other) {
+        return (this == &other);
+    }
+};
+
+} // namespace test
+
+#endif