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With inspiration from other libraries

There is a newer version: 2.12.15

package io.virtdata.libbasics.shared.functionadapters;

import io.virtdata.annotations.Categories;
import io.virtdata.annotations.Category;
import io.virtdata.annotations.ThreadSafeMapper;
import io.virtdata.api.composers.FunctionAssembly;
import io.virtdata.api.composers.FunctionComposer;
import io.virtdata.core.ResolvedFunction;
import io.virtdata.util.VirtDataFunctions;

import java.util.function.LongFunction;

/**
 * Combine functions into one.
 *
 * This function allows you to combine multiple other functions into one. This is often useful
 * for constructing more sophisticated recipes, when you don't have the ability to use
 * control flow or non-functional forms.
 *
 * The functions will be stitched together using the same logic that VirtData uses when
 * combining flows outside functions. That said, if the functions selected are not the right ones,
 * then it is possible to end up with the wrong data type at the end. To remedy this, be sure
 * to add input and output qualifiers, like long-> or ->String where
 * appropriate, to ensure that VirtData selects the right functions within the flow.
 */
@Categories(Category.conversion)
@ThreadSafeMapper
public class Flow implements LongFunction