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diff --git a/src/main/java/org/unitConverter/unit/FunctionalUnitlike.java b/src/main/java/org/unitConverter/unit/FunctionalUnitlike.java
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+++ b/src/main/java/org/unitConverter/unit/FunctionalUnitlike.java
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+/**
+ * Copyright (C) 2020 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.unit;
+
+import java.util.function.DoubleFunction;
+import java.util.function.ToDoubleFunction;
+
+import org.unitConverter.math.ObjectProduct;
+
+/**
+ * A unitlike form that converts using two conversion functions.
+ *
+ * @since 2020-09-07
+ */
+final class FunctionalUnitlike<V> extends Unitlike<V> {
+	/**
+	 * A function that accepts a value in the unitlike form's base and returns a
+	 * value in the unitlike form.
+	 * 
+	 * @since 2020-09-07
+	 */
+	private final DoubleFunction<V> converterFrom;
+	
+	/**
+	 * A function that accepts a value in the unitlike form and returns a value
+	 * in the unitlike form's base.
+	 */
+	private final ToDoubleFunction<V> converterTo;
+	
+	/**
+	 * Creates the {@code FunctionalUnitlike}.
+	 * 
+	 * @param base          unitlike form's base
+	 * @param converterFrom function that accepts a value in the unitlike form's
+	 *                      base and returns a value in the unitlike form.
+	 * @param converterTo   function that accepts a value in the unitlike form
+	 *                      and returns a value in the unitlike form's base.
+	 * @throws NullPointerException if any argument is null
+	 * @since 2019-05-22
+	 */
+	protected FunctionalUnitlike(ObjectProduct<BaseUnit> unitBase, NameSymbol ns,
+			DoubleFunction<V> converterFrom, ToDoubleFunction<V> converterTo) {
+		super(unitBase, ns);
+		this.converterFrom = converterFrom;
+		this.converterTo = converterTo;
+	}
+	
+	@Override
+	protected V convertFromBase(double value) {
+		return this.converterFrom.apply(value);
+	}
+	
+	@Override
+	protected double convertToBase(V value) {
+		return this.converterTo.applyAsDouble(value);
+	}
+	
+}