pub unsafe fn start_building_hook(
	builder: *mut bw::Unit,
	orig: &Fn(*mut bw::Unit)->u32,
) -> u32 {
	let result = orig(builder);
	let builder = match Unit::from_ptr(builder) {
        Some(s) => s,
        None => return result,
    };
	let game = Game::get();
	let globals = Globals::get("start building hook");
	let unit_search = UnitSearch::from_bw();
	let assume_pushing_units = globals.ai_mode[builder.player() as usize].move_from_baselayout;
		if builder.player()>=8 {
		return orig(builder);
		}
		if assume_pushing_units {
			let ok = check_placement(game, &unit_search, builder,
				((*builder.0).order_target_pos.x as i16)/32,
				((*builder.0).order_target_pos.y as i16)/32,
				builder.id(),
				assume_pushing_units,
				(*builder.0).order_target_pos);
			let area = bw::Rect {
				left: (builder.position().x).saturating_sub(32),
				top: (builder.position().y).saturating_sub(32),
				right: (builder.position().x) + (builder.id().placement().width as i16 / 2).saturating_add(32),
				bottom: (builder.position().y) + (builder.id().placement().height as i16 / 2).saturating_add(32),
			};
			let units = unit_search
				.search_iter(&area)
				.filter(|u| u.burrowed() && *u!=builder);
			for unit in units {
				bw::unburrow(unit.0);
			}
			if ok
			{
				return 1;
			}
		}
		result
}