{ "key": "optional", "boost-version": "1.30.0", "name": "Optional", "authors": [ "Fernando Cacciola" ], "description": "A value-semantic, type-safe wrapper for representing 'optional' (or 'nullable') objects of a given type. An optional object may or may not contain a value of the underlying type.", "category": [ "Data" ], "maintainers": [ "Fernando Cacciola ", "Andrzej Krzemienski " ] }