public Token <Material> Retain(Tuple key, System.Func <Material> valueGenerator)
{
Retainer <Material> ret;
if (!retainedMaterials.TryGetValue(key, out ret))
{
ret = retainedMaterials[key] = new Retainer <Material>(valueGenerator(), GenerateDisposer(key));
}
return(ret.Retain());
}
public Dash(Retainer <T> retainer)
{
this.retainer = retainer;
}