[XLA] Redesign: add XlaComputation::IsNull.

PiperOrigin-RevId: 192649052

diff --git a/tensorflow/compiler/xla/client/xla_client/xla_computation.h b/tensorflow/compiler/xla/client/xla_client/xla_computation.h
index 2a3c695..7182908 100644 (file)
--- a/tensorflow/compiler/xla/client/xla_client/xla_computation.h
+++ b/tensorflow/compiler/xla/client/xla_client/xla_computation.h
@@ -44,6 +44,9 @@ class XlaComputation {
 
   const HloModuleProto& proto() const { return proto_; }
 
+  // Returns true if this object is a null Computation.
+  bool IsNull() const { return unique_id_ == -1; }
+
  private:
   XlaComputation(const int64 unique_id) : unique_id_(unique_id) {}
   HloModuleProto* mutable_proto() { return &proto_; }