/* Copyright (c) 2021 PaddlePaddle 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. */

#pragma once

#include "paddle/pten/api/lib/utils/storage.h"
#include "paddle/pten/core/dense_tensor.h"
#include "paddle/pten/core/storage.h"
#include "paddle/pten/core/tensor_meta.h"

namespace pten {

/**
 * In order to meet some adaptation requirements of the compatible state,
 * these class is added to provide some tool functions.
 *
 * These utility functions may be deleted in the future, It is not recommended
 * to be widely used in the framework
 */

class CompatibleDenseTensorUtils {
 public:
  static Storage* UnsafeGetMutableStorage(DenseTensor* tensor) {
    return tensor->storage_.get();
  }

  static DenseTensorMeta* GetMutableMeta(DenseTensor* tensor) {
    return &(tensor->meta_);
  }

  // only can deal with SharedStorage now
  static void ClearStorage(DenseTensor* tensor) {
    // use static_cast to improve performance, replace by dynamic_cast later
    static_cast<paddle::experimental::SharedStorage*>(tensor->storage_.get())
        ->Reset();
  }
};

}  // namespace pten