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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 java.util.function.Function;
import java.util.function.LongFunction;
import java.util.function.LongUnaryOperator;

/**
 * Adapts any compatible {@link FunctionalInterface} type to a LongUnaryOperator,
 * for use with higher-order functions, when they require a
 * LongUnaryOperator as an argument. Some of the higher-order functions within
 * this library specifically require a LongUnaryOperator as an argument, while
 * some of the other functions are provided in semantically equivalent
 * forms with compatible types which can't be converted directly or
 * automatically by Java.
 *
 * In such cases, those types of functions can be wrapped with the forms
 * described here in order to allow the inner and outer functions to work together.
 */
@ThreadSafeMapper
@Categories({Category.diagnostics})
public class ToLongUnaryOperator implements LongUnaryOperator {

    private LongUnaryOperator operator;

    public ToLongUnaryOperator(LongFunction f) {
        this.operator = f::apply;
    }

    public ToLongUnaryOperator(Function f) {
        this.operator = f::apply;
    }

    public ToLongUnaryOperator(LongUnaryOperator f) {
        this.operator = f;
    }

    @Override
    public long applyAsLong(long operand) {
        return operator.applyAsLong(operand);
    }
}