HasTag.ixx File

Concept for detecting a compile-time engine role tag on a type. More...

Included Headers

#include <concepts>

Namespaces Index

namespace	helios
namespace	engine
	Main engine module aggregating core infrastructure and game systems. More...
namespace	common
	Shared type definitions, concepts, and tags used across engine subsystems. More...
namespace	concepts
	Compile-time concepts for engine role classification and capability detection. More...

Description

Concept for detecting a compile-time engine role tag on a type.

File Listing

The file content with the documentation metadata removed is:

1/**

2 * @file HasTag.ixx

3 * @brief Concept for detecting a compile-time engine role tag on a type.

4 */

5module;

6

7#include <concepts>

8

9export module helios.engine.common.concepts.HasTag;

10

11export namespace helios::engine::common::concepts {

12

13 /**

14 * @brief Detects whether T declares a nested `EngineRoleTag` alias equal to Tag.

15 *

16 * @details Used by role-specific concepts (IsManagerLike, IsSystemLike) to verify

17 * that a type has been explicitly tagged for a particular engine role.

18 * The tag must be declared as `using EngineRoleTag = Tag;` inside the class.

19 *

20 * @tparam T The type to inspect.

21 * @tparam Tag The expected tag type (e.g. ManagerRole, SystemRole).

22 *

23 * @see ManagerRole

24 * @see SystemRole

25 */

26 template<class T, class Tag>

27 concept HasTag = requires { typename T::EngineRoleTag; } &&

28 std::same_as<typename T::EngineRoleTag, Tag>;

29

30}

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