新增 Ref

src/main/java/xyz/zhouxy/plusone/commons/function/BoolUnaryOperator.java

@@ -0,0 +1,13 @@
+package xyz.zhouxy.plusone.commons.function;
+
+import com.google.common.annotations.Beta;
+
+@Beta
+@FunctionalInterface
+public interface BoolUnaryOperator {
+    boolean applyAsBool(boolean operand);
+
+    static BoolUnaryOperator not() {
+        return b -> !b;
+    }
+}

src/main/java/xyz/zhouxy/plusone/commons/function/CharUnaryOperator.java

@@ -0,0 +1,9 @@
+package xyz.zhouxy.plusone.commons.function;
+
+import com.google.common.annotations.Beta;
+
+@Beta
+@FunctionalInterface
+public interface CharUnaryOperator {
+    char applyAsChar(char operand);
+}