{"id":"visitor-recursive-computation-with-ocp-coverage","text":"Visitor's stateful recursive computation (accumulating results across heterogeneous elements via the recursive triad's traversal flexibility) operates within a bidirectional OCP framework: Composite enables adding new element types without modifying operations, and Visitor enables adding new operations without modifying elements — together yielding recursive stateful computation that is extensible along both the type and operation axes.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["visitor-recursive-stateful-operations","composite-visitor-dual-ocp-coverage"],"outlist":[],"label":"Visitor's recursive computation + Composite-Visitor's bidirectional OCP = doubly-extensible recursive computation"}],"dependents":["lexi-empirically-validates-recursive-ocp-capability","visitor-completes-recursive-ocp-with-stateful-computation"],"metadata":{"source_type":"derived","review_result":"pass"},"created_at":"2026-06-17T23:41:07+00:00","updated_at":"2026-06-18T06:15:08+00:00","reviewed_at":"2026-06-18T06:15:08+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"visitor-recursive-computation-with-ocp-coverage","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-recursive-stateful-operations","composite-visitor-dual-ocp-coverage"],"label":"Visitor's recursive computation + Composite-Visitor's bidirectional OCP = doubly-extensible recursive computation"},{"node":"visitor-recursive-stateful-operations","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-accumulates-across-structures","recursive-triad-traversal-flexibility"],"label":"Visitor's accumulation + Iterator's traversal flexibility = complete recursive computation"},{"node":"visitor-accumulates-across-structures","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-structure-independent-operations","gof-visitor-accumulates-state"],"label":"Structure independence plus state accumulation enables cross-element analysis over heterogeneous collections"},{"node":"visitor-structure-independent-operations","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-traverses-any-object-structure","gof-visitor-no-common-parent-required"],"label":"Two independently stated Visitor generality properties (any structure, no common parent) establish Visitor as universally applicable for operations"},{"node":"visitor-traverses-any-object-structure","truth_value":"IN","reason":"premise"},{"node":"gof-visitor-no-common-parent-required","truth_value":"IN","reason":"premise"},{"node":"gof-visitor-accumulates-state","truth_value":"IN","reason":"premise"},{"node":"recursive-triad-traversal-flexibility","truth_value":"IN","reason":"SL justification valid","antecedents":["composite-iterator-visitor-recursive-triad","iterator-dual-design-axes"],"label":"Iterator's two orthogonal axes multiply the recursive triad's combinatorial capability"},{"node":"composite-iterator-visitor-recursive-triad","truth_value":"IN","reason":"SL justification valid","antecedents":["composite-uniform-leaf-composite-treatment","iterator-separates-traversal-from-aggregate","visitor-enables-open-ended-operations","gof-iterator-related-composite-factory-memento"],"label":"Four base beliefs establish that these three patterns address orthogonal concerns over the same recursive data; the triad is the emergent structural relationship"},{"node":"composite-uniform-leaf-composite-treatment","truth_value":"IN","reason":"premise"},{"node":"iterator-separates-traversal-from-aggregate","truth_value":"IN","reason":"premise"},{"node":"visitor-enables-open-ended-operations","truth_value":"IN","reason":"premise"},{"node":"gof-iterator-related-composite-factory-memento","truth_value":"IN","reason":"premise"},{"node":"iterator-dual-design-axes","truth_value":"IN","reason":"SL justification valid","antecedents":["external-vs-internal-iterator-flexibility-tradeoff","traversal-and-action-orthogonal-concerns"],"label":"Two independently described Iterator design dimensions (control placement, concern separation) form a two-axis design space"},{"node":"external-vs-internal-iterator-flexibility-tradeoff","truth_value":"IN","reason":"premise"},{"node":"traversal-and-action-orthogonal-concerns","truth_value":"IN","reason":"premise"},{"node":"composite-visitor-dual-ocp-coverage","truth_value":"IN","reason":"SL justification valid","antecedents":["composite-as-universal-recursive-structure","visitor-inverts-ocp-axis"],"label":"Composite covers standard OCP axis (new types) while Visitor covers inverted axis (new operations) for the same structures"},{"node":"composite-as-universal-recursive-structure","truth_value":"IN","reason":"SL justification valid","antecedents":["composite-uniform-leaf-composite-treatment","interpreter-abstract-syntax-tree-is-composite","macrocommand-is-composite-of-commands"],"label":"Three distinct patterns reuse Composite's recursive composition structure"},{"node":"interpreter-abstract-syntax-tree-is-composite","truth_value":"IN","reason":"premise"},{"node":"macrocommand-is-composite-of-commands","truth_value":"IN","reason":"premise"},{"node":"visitor-inverts-ocp-axis","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-enables-open-ended-operations","visitor-tradeoff-stable-structure-required","ocp-open-for-extension-closed-for-modification"],"label":"Visitor's open-ops/closed-structure stance is the precise mirror of OCP's open-structure/closed-ops stance"},{"node":"visitor-tradeoff-stable-structure-required","truth_value":"IN","reason":"premise"},{"node":"ocp-open-for-extension-closed-for-modification","truth_value":"IN","reason":"premise"}]}}