tests/expectations/tests/contains-vs-inherits-zero-sized.rs

#![allow(
    dead_code,
    non_snake_case,
    non_camel_case_types,
    non_upper_case_globals
)]

/// This should get an `_address` byte.
#[repr(C)]
#[derive(Debug, Default, Copy, Clone)]
pub struct Empty {
    pub _address: u8,
}
#[test]
fn bindgen_test_layout_Empty() {
    assert_eq!(
        ::std::mem::size_of::<Empty>(),
        1usize,
        concat!("Size of: ", stringify!(Empty))
    );
    assert_eq!(
        ::std::mem::align_of::<Empty>(),
        1usize,
        concat!("Alignment of ", stringify!(Empty))
    );
}
/// This should not get an `_address` byte, so `sizeof(Inherits)` should be
/// `1`.
#[repr(C)]
#[derive(Debug, Default, Copy, Clone)]
pub struct Inherits {
    pub b: bool,
}
#[test]
fn bindgen_test_layout_Inherits() {
    assert_eq!(
        ::std::mem::size_of::<Inherits>(),
        1usize,
        concat!("Size of: ", stringify!(Inherits))
    );
    assert_eq!(
        ::std::mem::align_of::<Inherits>(),
        1usize,
        concat!("Alignment of ", stringify!(Inherits))
    );
    assert_eq!(
        {
            let struct_instance = unsafe { std::mem::zeroed::<Inherits>() };
            let struct_ptr = &struct_instance as *const Inherits;
            let field_ptr = std::ptr::addr_of!(struct_instance.b);
            let struct_address = struct_ptr as usize;
            let field_address = field_ptr as usize;
            std::mem::forget(struct_instance);
            field_address.checked_sub(struct_address).unwrap()
        },
        0usize,
        concat!(
            "Offset of field: ",
            stringify!(Inherits),
            "::",
            stringify!(b)
        )
    );
}
/// This should not get an `_address` byte, but contains `Empty` which *does* get
/// one, so `sizeof(Contains)` should be `1 + 1`.
#[repr(C)]
#[derive(Debug, Default, Copy, Clone)]
pub struct Contains {
    pub empty: Empty,
    pub b: bool,
}
#[test]
fn bindgen_test_layout_Contains() {
    assert_eq!(
        ::std::mem::size_of::<Contains>(),
        2usize,
        concat!("Size of: ", stringify!(Contains))
    );
    assert_eq!(
        ::std::mem::align_of::<Contains>(),
        1usize,
        concat!("Alignment of ", stringify!(Contains))
    );
    assert_eq!(
        {
            let struct_instance = unsafe { std::mem::zeroed::<Contains>() };
            let struct_ptr = &struct_instance as *const Contains;
            let field_ptr = std::ptr::addr_of!(struct_instance.empty);
            let struct_address = struct_ptr as usize;
            let field_address = field_ptr as usize;
            std::mem::forget(struct_instance);
            field_address.checked_sub(struct_address).unwrap()
        },
        0usize,
        concat!(
            "Offset of field: ",
            stringify!(Contains),
            "::",
            stringify!(empty)
        )
    );
    assert_eq!(
        {
            let struct_instance = unsafe { std::mem::zeroed::<Contains>() };
            let struct_ptr = &struct_instance as *const Contains;
            let field_ptr = std::ptr::addr_of!(struct_instance.b);
            let struct_address = struct_ptr as usize;
            let field_address = field_ptr as usize;
            std::mem::forget(struct_instance);
            field_address.checked_sub(struct_address).unwrap()
        },
        1usize,
        concat!(
            "Offset of field: ",
            stringify!(Contains),
            "::",
            stringify!(b)
        )
    );
}