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+/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+#ifndef TENSORFLOW_CONTRIB_LITE_DELEGATES_FLEX_DELEGATE_H_
+#define TENSORFLOW_CONTRIB_LITE_DELEGATES_FLEX_DELEGATE_H_
+
+#include "tensorflow/contrib/lite/c/c_api_internal.h"
+#include "tensorflow/contrib/lite/delegates/flex/delegate_data.h"
+
+namespace tflite {
+
+// WARNING: This is an experimental interface that is subject to change.
+// Delegate that can be used to extract parts of a graph that are designed to be
+// executed by TensorFlow's runtime via Eager.
+//
+// The interpreter must be constructed after the FlexDelegate and destructed
+// before the FlexDelegate. This delegate may be used with multiple
+// interpreters, but it is *not* thread-safe.
+//
+// Usage:
+//   auto delegate = FlexDelegate::Create();
+//   ... build interpreter ...
+//
+//   if (delegate) {
+//     interpreter->ModifyGraphWithDelegate(
+//         delegate.get(), /*allow_dynamic_tensors=*/true);
+//   }
+//   ... run inference ...
+//   ... destroy interpreter ...
+//   ... destroy delegate ...
+class FlexDelegate : public TfLiteDelegate {
+ public:
+  // Creates a delegate that supports TF ops.
+  //
+  // If the underyling TF Flex context creation fails, returns null.
+  static std::unique_ptr<FlexDelegate> Create();
+
+  ~FlexDelegate();
+
+ private:
+  explicit FlexDelegate(std::unique_ptr<flex::DelegateData> delegate_data);
+
+  std::unique_ptr<flex::DelegateData> delegate_data_;
+};
+
+}  // namespace tflite
+
+#endif  // TENSORFLOW_CONTRIB_LITE_DELEGATES_FLEX_DELEGATE_H_