Make ScopedFileDescriptor default ctor implicit

Having the default ctor marked explicit causes problems initializing
it using the {} syntax, which occurs, e.g. in
binder_parcel_utils.h:483

Without this change, compilation fails with:
"chosen constructor is explicit in copy-initialization"

Test: compiles
Change-Id: Ic261a3d9ce4bbd7d3d54402ccdcc4d4e02add271

1 files changed, 2 insertions, 1 deletions

diff --git a/libs/binder/ndk/include_cpp/android/binder_auto_utils.h b/libs/binder/ndk/include_cpp/android/binder_auto_utils.h
index 18877af32a..8d60226725 100644
--- a/libs/binder/ndk/include_cpp/android/binder_auto_utils.h
+++ b/libs/binder/ndk/include_cpp/android/binder_auto_utils.h
@@ -313,7 +313,8 @@ class ScopedFileDescriptor : public impl::ScopedAResource<int, int, close, -1> {
     /**
      * Takes ownership of a.
      */
-    explicit ScopedFileDescriptor(int a = -1) : ScopedAResource(a) {}
+    ScopedFileDescriptor() : ScopedFileDescriptor(-1) {}
+    explicit ScopedFileDescriptor(int a) : ScopedAResource(a) {}
     ~ScopedFileDescriptor() {}
     ScopedFileDescriptor(ScopedFileDescriptor&&) = default;
     ScopedFileDescriptor& operator=(ScopedFileDescriptor&&) = default;