group: removed ::empty<T...>, misleading information (breaking change)

src/entt/entity/group.hpp

@@ -186,17 +186,11 @@ public:
     }
 
     /**
-     * @brief Checks whether a group or some pools are empty.
-     * @tparam Component Types of components in which one is interested.
-     * @return True if the group or the pools are empty, false otherwise.
+     * @brief Checks whether a group is empty.
+     * @return True if the group is empty, false otherwise.
      */
-    template<typename... Component>
     [[nodiscard]] bool empty() const ENTT_NOEXCEPT {
-        if constexpr(sizeof...(Component) == 0) {
-            return handler->empty();
-        } else {
-            return (std::get<storage_type<Component> *>(pools)->empty() && ...);
-        }
+        return handler->empty();
     }
 
     /**
@@ -697,17 +691,11 @@ public:
     }
 
     /**
-     * @brief Checks whether a group or some pools are empty.
-     * @tparam Component Types of components in which one is interested.
-     * @return True if the group or the pools are empty, false otherwise.
+     * @brief Checks whether a group is empty.
+     * @return True if the group is empty, false otherwise.
      */
-    template<typename... Component>
     [[nodiscard]] bool empty() const ENTT_NOEXCEPT {
-        if constexpr(sizeof...(Component) == 0) {
-            return !*length;
-        } else {
-            return (std::get<storage_type<Component> *>(pools)->empty() && ...);
-        }
+        return !*length;
     }
 
     /**

test/entt/entity/group.cpp

@@ -19,8 +19,6 @@ TEST(NonOwningGroup, Functionalities) {
     auto cgroup = std::as_const(registry).group(entt::get<const int, const char>);
 
     ASSERT_TRUE(group.empty());
-    ASSERT_TRUE((group.empty<int, char>()));
-    ASSERT_TRUE((cgroup.empty<const int, const char>()));
 
     const auto e0 = registry.create();
     registry.emplace<char>(e0, '1');
@@ -30,8 +28,6 @@ TEST(NonOwningGroup, Functionalities) {
     registry.emplace<char>(e1, '2');
 
     ASSERT_FALSE(group.empty());
-    ASSERT_FALSE(group.empty<int>());
-    ASSERT_FALSE(cgroup.empty<const char>());
     ASSERT_NO_THROW(group.begin()++);
     ASSERT_NO_THROW(++cgroup.begin());
     ASSERT_NO_THROW([](auto it) { return it++; }(group.rbegin()));
@@ -582,8 +578,6 @@ TEST(OwningGroup, Functionalities) {
     auto cgroup = std::as_const(registry).group<const int>(entt::get<const char>);
 
     ASSERT_TRUE(group.empty());
-    ASSERT_TRUE((group.empty<int, char>()));
-    ASSERT_TRUE((cgroup.empty<const int, const char>()));
 
     const auto e0 = registry.create();
     registry.emplace<char>(e0, '1');
@@ -593,8 +587,6 @@ TEST(OwningGroup, Functionalities) {
     registry.emplace<char>(e1, '2');
 
     ASSERT_FALSE(group.empty());
-    ASSERT_FALSE(group.empty<int>());
-    ASSERT_FALSE(cgroup.empty<const char>());
     ASSERT_NO_THROW(group.begin()++);
     ASSERT_NO_THROW(++cgroup.begin());
     ASSERT_NO_THROW([](auto it) { return it++; }(group.rbegin()));