public static <T0, T1> Supplier<MutableTuple2<T0, T1>> constructor(Class<T0> e0, Class<T1> e1) {
        return MutableTuple2Impl::new;
    }
Creates and returns a new {@link MutableTuple2} constructor that creates
an object that is empty.

@param <T0> type of element 0
@param <T1> type of element 1
@param e0   element 0
@param e1   element 1
@return     a new {@link MutableTuple2} constructor that creates an
            object that is empty.

@see Tuple2
@see Tuple
common-parent/tuple/src/main/java/com/speedment/common/tuple/MutableTuples.java