playground.mojo

struct DemoStruct(CollectionElement, Stringable):
    var member1: Int

    fn __init__(inout self, member1: Int) -> None:
        self.member1 = member1
        print("Called constructor for " + str(self))

    fn __copyinit__(inout self, other: Self) -> None:
        self.member1 = other.member1
        print("Called copy constructor for " + str(self))

    fn __moveinit__(inout self, owned other: Self) -> None:
        self.member1 = other.member1
        print("Called move constructor for " + str(self))

    fn __del__(owned self) -> None:
        print("Calling destructor for " + str(self))

    fn __str__(self) -> String:
        return "DemoStruct(" + str(self.member1) + ")"

    fn modify(inout self, new_value: Int) -> None:
        print("Entering modify function")
        self.member1 = new_value
        print("Exiting modify function")


fn main() -> None:
    var demo_obj_1 = DemoStruct(42)
    demo_obj_1.modify(10)
    demo_obj_1.modify(20)
    print(demo_obj_1)