{"id":"singleton-controlled-global-access","text":"Singleton provides controlled global access that systematically improves on raw global/static objects across four dimensions: lazy initialization avoids premature construction, the Instance() method controls the creation point, a registry enables subclass selection without modifying clients, and the pattern permits future evolution to multiple instances.","truth_value":"OUT","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["singleton-lazy-initialization-pattern","singleton-more-flexible-than-static-methods","singleton-not-global-static-object-cpp","singleton-registry-for-subclass-selection"],"outlist":[],"label":"Four base beliefs about Singleton's advantages unify into a single controlled-access thesis"}],"dependents":["creational-lifecycle-spectrum"],"metadata":{"source_type":"derived","review_result":"pass"},"created_at":"2026-06-17T17:55:06+00:00","updated_at":"2026-06-17T20:39:50+00:00","reviewed_at":"2026-06-17T20:39:50+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"singleton-controlled-global-access","truth_value":"OUT","reason":"SL justification invalid","failed_antecedents":["singleton-more-flexible-than-static-methods"],"label":"Four base beliefs about Singleton's advantages unify into a single controlled-access thesis"}]}}