// <editor-fold defaultstate="collapsed" desc="named()">
public FunctionSetHelper named(final String name) {
if (name == null) throw new IllegalArgumentException("name==null");
if (mem == null) return new FunctionSetHelper(Iterators.<Function>empty());
Object o = mem.get(name);
if (o instanceof Function) {
FunctionSetHelper fs = new FunctionSetHelper(Iterators.<Function>single((Function) o));
fs.mem = mem;
return fs;
}
if (o instanceof FunctionSet) {
FunctionSetHelper fs = new FunctionSetHelper(((FunctionSet) o).getFunctions());
fs.mem = mem;
return fs;
}
return new FunctionSetHelper(Iterators.<Function>empty());
}
// <editor-fold defaultstate="collapsed" desc="functions()">
public Iterable<Function> functions() {
if (fset != null) return fset.getFunctions();
if (funitr != null) return funitr;
return Iterators.empty();
}