Add traits to common utils data structures.
Many of our basic data structures are trivially movable using
memcpy() even if they are not trivially constructable, destructable
or copyable. It's worth taking advantage of this *ahem* trait.
Adding trivial_move_trait to String16 reduces appt running
time on frameworks/base/core/res by 40%!
Change-Id: I630a1a027e2d0ded96856e4ca042ea82906289fe
diff --git a/include/utils/String16.h b/include/utils/String16.h
index 360f407..fe06c57 100644
--- a/include/utils/String16.h
+++ b/include/utils/String16.h
@@ -20,6 +20,7 @@
#include <utils/Errors.h>
#include <utils/SharedBuffer.h>
#include <utils/Unicode.h>
+#include <utils/TypeHelpers.h>
// ---------------------------------------------------------------------------
@@ -112,6 +113,10 @@
const char16_t* mString;
};
+// String16 can be trivially moved using memcpy() because moving does not
+// require any change to the underlying SharedBuffer contents or reference count.
+ANDROID_TRIVIAL_MOVE_TRAIT(String16)
+
TextOutput& operator<<(TextOutput& to, const String16& val);
// ---------------------------------------------------------------------------