{"id":"singleton-cross-category-sharing-infrastructure","text":"Singleton provides controlled sharing infrastructure across all three GoF pattern categories: behaviorally, State subclasses share as Singletons to avoid redundant state objects; structurally, Facade uses Singleton for unified subsystem access points; creationally, Singleton registries enable runtime subclass selection for Abstract Factory and Prototype Manager patterns — making Singleton the catalog's primary sharing-enablement mechanism.","truth_value":"OUT","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["gof-state-subclasses-often-singletons","facade-often-singleton","singleton-registry-for-subclass-selection"],"outlist":[],"label":"Singleton's lazy initialization and registry mechanisms serve sharing needs across all three GoF categories"}],"dependents":[],"metadata":{"source_type":"derived","review_result":"invalid","_retracted":true},"created_at":"2026-06-18T03:58:42+00:00","updated_at":"2026-06-18T06:49:53+00:00","reviewed_at":"2026-06-18T06:15:08+00:00","verified_at":"","retracted_at":"2026-06-18T06:49:53+00:00","explanation":{"steps":[{"node":"singleton-cross-category-sharing-infrastructure","truth_value":"OUT","reason":"SL justification invalid","failed_antecedents":[],"label":"Singleton's lazy initialization and registry mechanisms serve sharing needs across all three GoF categories"}]}}