public static <T> ToLong<T> longMultiplyInt(ToLong<T> first, ToInt<T> second) {
        class LongMultiplyInt extends AbstractMultiply<T, ToLong<T>, ToInt<T>> implements ToLong<T> {
            private LongMultiplyInt(ToLong<T> first, ToInt<T> second) {
                super(first, second);
            }

            @Override
            public long applyAsLong(T object) {
                return firstInner.applyAsLong(object)
                    * secondInner.applyAsInt(object);
            }
        }

        return new LongMultiplyInt(first, second);
    }
Creates and returns an expression that takes the result of the two
expressions and multiplies them to get the product.

@param first   the first input expression
@param second  the second input expression
@param <T>     the input type
@return        the new expression
runtime-parent/runtime-compute/src/main/java/com/speedment/runtime/compute/internal/expression/MultiplyUtil.java