public List <T> Filter(ListFilterCallback <T> filterCallback) { return(null); }
public bool Every(ListFilterCallback <T> filterCallback) { return(false); }
public bool Some(ListFilterCallback <T> filterCallback) { return(false); }
public extern bool Some(ListFilterCallback <T> filterCallback);
public extern List <T> Filter(ListFilterCallback <T> filterCallback);
public extern bool Every(ListFilterCallback <T> filterCallback);