class Holder {
	weak uint[] idx;

	public Holder.copy(Holder src, uint[] idx) {
		this.idx = idx;
	}
}

class Geometry {
	uint[] idx;
	Holder[] holders;

	Geometry.copy(Geometry src) {
		this.holders = new Holder[src.holders.length];
		uint i=0U;
		foreach(weak Holder holder in this.holders)
			this.holders[i++] = new Holder.copy(holder, this.idx);
	}
}