use std::marker::PhantomData;
pub struct Field<T> {
offs: usize,
size: usize,
phantom: PhantomData<T>,
}
impl<T> Field<T> {
pub const fn offs(&self) -> usize {
self.offs
}
pub const fn size(&self) -> usize {
self.size
}
}
#[doc(hidden)]
pub fn _hidden_field<T>(offs: usize, _: Option<&T>) -> Field<T> {
Field {
offs,
size: std::mem::size_of::<T>(),
phantom: PhantomData,
}
}
#[macro_export]
macro_rules! field {
($struct_name:ident, $field_name:ident) => {{
let opt = None::<&$struct_name>.map(|v| &v.$field_name);
let offs = $crate::__glium_offset_of!($struct_name, $field_name);
$crate::field::_hidden_field(offs, opt)
}};
}