`helios/ecs/concepts/README.md` File

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namespace	concepts
	Compile-time constraints for ECS extension points. More...

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# helios::ecs::concepts

Compile-time constraints for ECS extension points.

## Overview

This submodule defines concepts that constrain the template parameters used

across `helios.ecs`. They ensure that user-provided types satisfy the

structural requirements expected by the generic ECS infrastructure at compile

time.

## Concepts

| Concept | Purpose |

|---------|---------|

| `IsStrongIdCollisionResolverLike` | Constrains lookup strategies used by `EntityRegistry` for strong ID collision detection |

## IsStrongIdCollisionResolverLike

Requires a type to provide `add`, `remove`, and `has` operations on `StrongId_t`

values, each returning `bool`. Any type satisfying this concept can be used as the

`TLookupStrategy` parameter of `EntityRegistry`.

**Satisfied by:**

- `HashedLookupStrategy` — O(1) amortised, default strategy

- `LinearLookupStrategy` — O(n) scan, suitable for small registries

## Related Modules

| Module | Purpose |

|--------|---------|

| `helios.ecs.EntityRegistry` | Primary consumer of the lookup strategy concept |

| `helios.ecs.HashedLookupStrategy` | Hash-based strategy implementation |

| `helios.ecs.LinearLookupStrategy` | Linear-scan strategy implementation |

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<summary>Doxygen</summary><p>

@namespace helios::ecs::concepts

@brief Compile-time constraints for ECS extension points.

@details Defines concepts that constrain template parameters used by the generic ECS infrastructure, such as lookup strategies for EntityRegistry.

</p></details>

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