Class Box

mypyc/ir/ops.py:1154–1181

box(type, src) This converts from a potentially unboxed representation to a straight Python object. Only supported for types with an unboxed representation.

@final
class Box(RegisterOp):
    """box(type, src)

    This converts from a potentially unboxed representation to a straight Python object.
    Only supported for types with an unboxed representation.
    """

    error_kind = ERR_NEVER

    def __init__(self, src: Value, line: int = -1) -> None:
        super().__init__(line)
        self.src = src
        self.type = object_rprimitive
        # When we box None and bool values, we produce a borrowed result
        if is_none_rprimitive(self.src.type) or is_bool_or_bit_rprimitive(self.src.type):
            self.is_borrowed = True

    def sources(self) -> list[Value]:
        return [self.src]

    def set_sources(self, new: list[Value]) -> None:
        (self.src,) = new

    def stolen(self) -> list[Value]:
        return [self.src]

    def accept(self, visitor: OpVisitor[T]) -> T:
        return visitor.visit_box(self)


@final