signal: swap based move assignment operators

src/entt/signal/dispatcher.hpp

@@ -194,7 +194,7 @@ public:
      */
     basic_dispatcher &operator=(basic_dispatcher &&other) noexcept {
         ENTT_ASSERT(alloc_traits::is_always_equal::value || get_allocator() == other.get_allocator(), "Copying a dispatcher is not allowed");
-        pools = std::move(other.pools);
+        swap(other);
         return *this;
     }
 

src/entt/signal/emitter.hpp

@@ -96,7 +96,7 @@ public:
      */
     emitter &operator=(emitter &&other) noexcept {
         ENTT_ASSERT(alloc_traits::is_always_equal::value || handlers.second() == other.handlers.second(), "Copying an emitter is not allowed");
-        handlers = std::move(other.handlers);
+        swap(other);
         return *this;
     }
 

src/entt/signal/sigh.hpp

@@ -125,8 +125,8 @@ public:
      * @param other The instance to move from.
      * @return This signal handler.
      */
-    sigh &operator=(sigh &&other) noexcept(std::is_nothrow_move_assignable_v<container_type>) {
-        calls = std::move(other.calls);
+    sigh &operator=(sigh &&other) noexcept(std::is_nothrow_swappable_v<container_type>) {
+        swap(other);
         return *this;
     }