static <T> ToString<T> of(Function<T, String> lambda) {
        if (lambda instanceof ToString) {
            return (ToString<T>) lambda;
        } else {
            return lambda::apply;
        }
    }
Returns a typed {@code ToString<T>} using the provided {@code lambda}.

@param <T> type to extract from
@param lambda to convert
@return a typed {@code ToString<T>} using the provided {@code lambda}

@throws NullPointerException if the provided {@code lambda} is
{@code null}
runtime-parent/runtime-compute/src/main/java/com/speedment/runtime/compute/ToString.java