use cpp_oop::gen_oop;

gen_oop! {
    #[default]
    struct Foo {
        foo: u32,
    }

    struct FooLayout {
        #[virt]
        foo: fn(this: &Self, a: i32) -> u32,
    }

    impl FooMethodsInner for Foo {
        extern "C" fn foo_inner_virt(_this: &Self, _a: i32) -> u32 {
            1
        }
    }
}

#[test]
fn layout() {
    assert_eq!(std::mem::size_of::<Foo>(), std::mem::size_of::<usize>() * 2);
}

#[test]
fn basic() {
    let f = Foo::default();
    let f_ptr = &f as *const Foo;

    assert_eq!(Foo::foo_inner_virt(&f, 0), 1); // manual selection of the method to call
    assert_eq!(f.foo(0), 1); // static dispatch
    assert_eq!(f_ptr.foo(0), 1); // use vtable lookup
}