Add __bool__ to queries

Author: HexDecimal

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Queries are now truthy if they match any entity.
+
 ## [5.1.0] - 2024-02-13
 
 ### Changed

tcod/ecs/query.py

@@ -352,6 +352,10 @@ def get_entities(self) -> AbstractSet[Entity]:
         """
         return _get_query(self.registry, self._query)
 
+    def __bool__(self) -> bool:
+        """Return True if any entity matches this query."""
+        return bool(self.get_entities())
+
     @staticmethod
     def __as_queries(
         components: Iterable[ComponentKey[object]] = (),