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diff --git a/src/main/java/org/apache/commons/lang3/function/FailableToLongFunction.java b/src/main/java/org/apache/commons/lang3/function/FailableToLongFunction.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.lang3.function;
+
+import java.util.function.ToLongFunction;
+
+/**
+ * A functional interface like {@link ToLongFunction} that declares a {@link Throwable}.
+ *
+ * @param <T> the type of the first argument to the function
+ * @param <E> The kind of thrown exception or error.
+ * @since 3.11
+ */
+@FunctionalInterface
+public interface FailableToLongFunction<T, E extends Throwable> {
+
+    /** NOP singleton */
+    @SuppressWarnings("rawtypes")
+    FailableToLongFunction NOP = t -> 0L;
+
+    /**
+     * Returns The NOP singleton.
+     *
+     * @param <T> the type of the argument to the function
+     * @param <E> The kind of thrown exception or error.
+     * @return The NOP singleton.
+     */
+    static <T, E extends Throwable> FailableToLongFunction<T, E> nop() {
+        return NOP;
+    }
+
+    /**
+     * Applies this function to the given arguments.
+     *
+     * @param t the first function argument
+     * @return the function result
+     * @throws E Thrown when the function fails.
+     */
+    long applyAsLong(T t) throws E;
+}