docs(ecs): add core-ecs-entity module

core/include/cubos/core/ecs/entity/entity.hpp

@@ -1,6 +1,6 @@
 /// @file
 /// @brief Struct @ref cubos::core::ecs::Entity.
-/// @ingroup core-ecs
+/// @ingroup core-ecs-entity
 
 #pragma once
 
@@ -16,7 +16,7 @@ namespace cubos::core::ecs
     /// (de)serialize strings representing the entities. Otherwise, the identifiers will be
     /// (de)serialized as objects with two fields: their index and their generation.
     ///
-    /// @ingroup core-ecs
+    /// @ingroup core-ecs-entity
     struct Entity
     {
         /// @brief Type used to store which components an entity has.

core/include/cubos/core/ecs/entity/hash.hpp

@@ -1,6 +1,6 @@
 /// @file
 /// @brief Struct @ref cubos::core::ecs::EntityHash.
-/// @ingroup core-ecs
+/// @ingroup core-ecs-entity
 
 #pragma once
 
@@ -14,7 +14,7 @@ namespace cubos::core::ecs
     ///
     /// Can be used to allow @ref Entity objects to be used as keys in an `std::unordered_map`.
     ///
-    /// @ingroup core-ecs
+    /// @ingroup core-ecs-entity
     struct EntityHash
     {
         std::size_t operator()(const Entity& entity) const noexcept;

core/include/cubos/core/ecs/entity/manager.hpp

@@ -1,6 +1,6 @@
 /// @file
 /// @brief Class @ref cubos::core::ecs::EntityManager.
-/// @ingroup core-ecs
+/// @ingroup core-ecs-entity
 
 #pragma once
 
@@ -14,11 +14,11 @@
 
 namespace cubos::core::ecs
 {
-    /// @brief Holds and manages entities and their component masks.
+    /// @brief Internal type which holds and manages entities and their component masks.
     ///
     /// Used internally by @ref World.
     ///
-    /// @ingroup core-ecs
+    /// @ingroup core-ecs-entity
     class EntityManager final
     {
     public:

core/include/cubos/core/ecs/entity/module.dox

@@ -0,0 +1,9 @@
+/// @dir
+/// @brief @ref core-ecs-entity directory.
+
+namespace cubos::core::ecs
+{
+    /// @defgroup core-ecs-entity Entity
+    /// @ingroup core-ecs
+    /// @brief Entity part of the ECS.
+}