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#![feature(const_raw_ptr_deref)]
#![feature(const_ptr_offset_from)]
#![feature(ptr_offset_from)]
#[repr(C)]
struct Struct {
data: u8,
field: u8,
}
pub const DIFFERENT_ALLOC: usize = {
//~^ NOTE
let uninit = std::mem::MaybeUninit::<Struct>::uninit();
let base_ptr: *const Struct = &uninit as *const _ as *const Struct;
let uninit2 = std::mem::MaybeUninit::<Struct>::uninit();
let field_ptr: *const Struct = &uninit2 as *const _ as *const Struct;
let offset = unsafe { field_ptr.offset_from(base_ptr) };
offset as usize
};
pub const NOT_PTR: usize = {
//~^ NOTE
unsafe { (42 as *const u8).offset_from(&5u8) as usize }
};
pub const NOT_MULTIPLE_OF_SIZE: isize = {
//~^ NOTE
let data = [5u8, 6, 7];
let base_ptr = data.as_ptr();
let field_ptr = &data[1] as *const u8 as *const u16;
unsafe { field_ptr.offset_from(base_ptr as *const u16) }
};
pub const OFFSET_FROM_NULL: isize = {
//~^ NOTE
let ptr = 0 as *const u8;
unsafe { ptr.offset_from(ptr) }
};
pub const DIFFERENT_INT: isize = { // offset_from with two different integers: like DIFFERENT_ALLOC
//~^ NOTE
let ptr1 = 8 as *const u8;
let ptr2 = 16 as *const u8;
unsafe { ptr2.offset_from(ptr1) }
};
fn main() {}
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