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| 1 | namespace IR.Values is | |
| 2 | use Semantic.Types.Type | |
| 3 | ||
| 4 | // Wrap a value-type T in its value-type optional form NULLABLE[T] (= | |
| 5 | // System.Nullable[T]). Emits the Nullable<T>::.ctor(T) call IL. | |
| 6 | // Counterpart to BOX (T → object) at value-meets-slot boundaries — | |
| 7 | // used by VALUE_BOXER.wrap_if_needed when an implicit conversion | |
| 8 | // from T to T? is required. | |
| 9 | class WRAP_OPTIONAL: Value is | |
| 10 | value: Value | |
| 11 | _optional_type: Type | |
| 12 | type: Type => _optional_type | |
| 13 | is_value_type: bool => true | |
| 14 | ||
| 15 | init( | |
| 16 | optional_type: Type, | |
| 17 | value: Value | |
| 18 | ) is | |
| 19 | super.init() | |
| 20 | ||
| 21 | self._optional_type = optional_type | |
| 22 | self.value = value | |
| 23 | si | |
| 24 | ||
| 25 | gen(context: IR.CONTEXT) is | |
| 26 | gen(value, context) | |
| 27 | ||
| 28 | let body = context.current_srm_body_emitter! | |
| 29 | body.new_object(context.resolve_generic_constructor(_optional_type, 1)) | |
| 30 | si | |
| 31 | ||
| 32 | to_string() -> string => | |
| 33 | "wrap-optional:[{_optional_type}]({value})" | |
| 34 | si | |
| 35 | si |