new FunctionException type

pandalib-util/src/main/java/fr/pandacube/lib/util/function/FunctionException.java

@@ -0,0 +1,19 @@
+package fr.pandacube.lib.util.function;
+
+/**
+ * A function that can possibly throw a checked exception.
+ * @param <T> the parameter for this function.
+ * @param <R> the return value for this function.
+ * @param <E> the exception type that this interface method can throw.
+ */
+@FunctionalInterface
+public interface FunctionException<T, R, E extends Exception> {
+    /**
+     * Run on the specified parameters to return an int value.
+     *
+     * @param t the parameter of the function.
+     * @return the result of the function.
+     * @throws E if the function fails.
+     */
+    R apply(T t) throws E;
+}