ftl_flags: Add default parameter to any()

Add a default parameter to any() so that we can easily test if any of
the bits in the bitfield have been set.

Bug: 245989146
Test: atest ftl_test
Change-Id: Ibee03c2f70288d1a353e1d86539fb7f88b1e5d3c
diff --git a/include/ftl/flags.h b/include/ftl/flags.h
index cdb4e84..dbe3148 100644
--- a/include/ftl/flags.h
+++ b/include/ftl/flags.h
@@ -120,7 +120,7 @@
     }
 
     /* Tests whether any of the given flags are set */
-    bool any(Flags<F> f) const { return (mFlags & f.mFlags) != 0; }
+    bool any(Flags<F> f = ~Flags<F>()) const { return (mFlags & f.mFlags) != 0; }
 
     /* Tests whether all of the given flags are set */
     bool all(Flags<F> f) const { return (mFlags & f.mFlags) == f.mFlags; }
diff --git a/libs/ftl/flags_test.cpp b/libs/ftl/flags_test.cpp
index eea052b..1279d11 100644
--- a/libs/ftl/flags_test.cpp
+++ b/libs/ftl/flags_test.cpp
@@ -35,6 +35,7 @@
 
 TEST(Flags, Any) {
     Flags<TestFlags> flags = TestFlags::ONE | TestFlags::TWO;
+    ASSERT_TRUE(flags.any());
     ASSERT_TRUE(flags.any(TestFlags::ONE));
     ASSERT_TRUE(flags.any(TestFlags::TWO));
     ASSERT_FALSE(flags.any(TestFlags::THREE));
@@ -42,6 +43,9 @@
     ASSERT_TRUE(flags.any(TestFlags::TWO | TestFlags::THREE));
     ASSERT_TRUE(flags.any(TestFlags::ONE | TestFlags::THREE));
     ASSERT_TRUE(flags.any(TestFlags::ONE | TestFlags::TWO | TestFlags::THREE));
+
+    Flags<TestFlags> emptyFlags;
+    ASSERT_FALSE(emptyFlags.any());
 }
 
 TEST(Flags, All) {