Move ecs::entity_accessor to a separate header

libs/ecs/include/psemek/ecs/entity_accessor.hpp

@@ -0,0 +1,112 @@
+#pragma once
+
+#include <psemek/ecs/detail/table.hpp>
+#include <psemek/ecs/entity_accessor.hpp>
+#include <psemek/util/span.hpp>
+#include <psemek/util/range.hpp>
+#include <psemek/util/exception.hpp>
+#include <psemek/util/type_name.hpp>
+#include <psemek/util/to_string.hpp>
+
+#include <typeindex>
+
+namespace psemek::ecs
+{
+
+	struct component_not_found_exception
+		: util::exception
+	{
+		component_not_found_exception(std::type_info const & type, entity_handle const & handle, boost::stacktrace::stacktrace stacktrace = {})
+			: util::exception(util::to_string("Component ", util::type_name(type), " not found for entity ", handle), std::move(stacktrace))
+			, type_(type)
+			, handle_(handle)
+		{}
+
+		std::type_info const & type() const
+		{
+			return type_;
+		}
+
+		entity_handle const & handle() const
+		{
+			return handle_;
+		}
+
+	private:
+		std::type_info const & type_;
+		entity_handle handle_;
+	};
+
+	struct entity_accessor
+	{
+		entity_accessor() = default;
+		entity_accessor(entity_accessor const &) = default;
+
+		explicit operator bool() const;
+
+		/** Obtain a pointer to the specified component type
+		 *    of the accessed entity, or a null pointer if
+		 *    the entity doesn't contain this component type.
+		 */
+		template <typename Component>
+		Component * get_if();
+
+		/** Obtain a reference to the specified component type
+		 *    of the accessed entity.
+		 *  If the entity doesn't contain this component type,
+		 *    an exception of type `component_not_found_exception` is thrown.
+		 */
+		template <typename Component>
+		Component & get();
+
+		/** Check if the entity contains this component type.
+		 */
+		template <typename Component>
+		bool contains() const;
+
+	private:
+		detail::table * table_ = nullptr;
+		std::uint32_t row_ = 0;
+
+		friend struct entity_container;
+
+		entity_accessor(detail::table * table, std::uint32_t row);
+	};
+
+	inline entity_accessor::operator bool() const
+	{
+		return table_ != nullptr;
+	}
+
+	template <typename Component>
+	Component * entity_accessor::get_if()
+	{
+		util::uuid const uuid = Component::uuid();
+
+		auto column = table_->column(uuid);
+		if (!column)
+			return nullptr;
+
+		return reinterpret_cast<Component *>(column->data() + detail::stride<Component>() * row_);
+	}
+
+	template <typename Component>
+	Component & entity_accessor::get()
+	{
+		if (auto ptr = get_if<Component>())
+			return *ptr;
+		throw component_not_found_exception(typeid(Component), table_->entity_handles()[row_]);
+	}
+
+	template <typename Component>
+	bool entity_accessor::contains() const
+	{
+		return get_if<Component>() != nullptr;
+	}
+
+	inline entity_accessor::entity_accessor(detail::table * table, std::uint32_t row)
+		: table_(table)
+		, row_(row)
+	{}
+
+}

libs/ecs/include/psemek/ecs/entity_container.hpp

@@ -6,6 +6,7 @@
 #include <psemek/ecs/detail/apply_helper.hpp>
 #include <psemek/ecs/detail/all_different_types.hpp>
 #include <psemek/ecs/detail/component_uuid_helper.hpp>
+#include <psemek/ecs/entity_accessor.hpp>
 #include <psemek/util/span.hpp>
 #include <psemek/util/range.hpp>
 #include <psemek/util/exception.hpp>
@@ -19,66 +20,6 @@ namespace psemek::ecs
 
 	using query_cache = std::shared_ptr<detail::query_cache>;
 
-	struct component_not_found_exception
-		: util::exception
-	{
-		component_not_found_exception(std::type_info const & type, entity_handle const & handle, boost::stacktrace::stacktrace stacktrace = {})
-			: util::exception(util::to_string("Component ", util::type_name(type), " not found for entity ", handle), std::move(stacktrace))
-			, type_(type)
-			, handle_(handle)
-		{}
-
-		std::type_info const & type() const
-		{
-			return type_;
-		}
-
-		entity_handle const & handle() const
-		{
-			return handle_;
-		}
-
-	private:
-		std::type_info const & type_;
-		entity_handle handle_;
-	};
-
-	struct entity_accessor
-	{
-		entity_accessor() = default;
-		entity_accessor(entity_accessor const &) = default;
-
-		explicit operator bool() const;
-
-		/** Obtain a pointer to the specified component type
-		 *    of the accessed entity, or a null pointer if
-		 *    the entity doesn't contain this component type.
-		 */
-		template <typename Component>
-		Component * get_if();
-
-		/** Obtain a reference to the specified component type
-		 *    of the accessed entity.
-		 *  If the entity doesn't contain this component type,
-		 *    an exception of type `component_not_found_exception` is thrown.
-		 */
-		template <typename Component>
-		Component & get();
-
-		/** Check if the entity contains this component type.
-		 */
-		template <typename Component>
-		bool contains() const;
-
-	private:
-		detail::table * table_ = nullptr;
-		std::uint32_t row_ = 0;
-
-		friend struct entity_container;
-
-		entity_accessor(detail::table * table, std::uint32_t row);
-	};
-
 	struct entity_container
 	{
 		/** Create an entity with the specified components.
@@ -390,40 +331,4 @@ namespace psemek::ecs
 		}
 	}
 
-	inline entity_accessor::operator bool() const
-	{
-		return table_ != nullptr;
-	}
-
-	template <typename Component>
-	Component * entity_accessor::get_if()
-	{
-		util::uuid const uuid = Component::uuid();
-
-		auto column = table_->column(uuid);
-		if (!column)
-			return nullptr;
-
-		return reinterpret_cast<Component *>(column->data() + detail::stride<Component>() * row_);
-	}
-
-	template <typename Component>
-	Component & entity_accessor::get()
-	{
-		if (auto ptr = get_if<Component>())
-			return *ptr;
-		throw component_not_found_exception(typeid(Component), table_->entity_handles()[row_]);
-	}
-
-	template <typename Component>
-	bool entity_accessor::contains() const
-	{
-		return get_if<Component>() != nullptr;
-	}
-
-	inline entity_accessor::entity_accessor(detail::table * table, std::uint32_t row)
-		: table_(table)
-		, row_(row)
-	{}
-
 }