/**
 * Copyright 2019 Huawei Technologies Co., Ltd
 *
 * 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 DATASET_UTIL_MEMORY_POOL_H_
#define DATASET_UTIL_MEMORY_POOL_H_

#include <cstddef>
#include <cstdint>
#include <memory>
#include "dataset/util/status.h"

namespace mindspore {
namespace dataset {
// Abstract class of a memory pool
class MemoryPool {
 public:
  // Allocate a block of size n
  virtual Status Allocate(size_t, void **) = 0;

  // Enlarge or shrink a block from oldSz to newSz
  virtual Status Reallocate(void **, size_t old_sz, size_t new_sz) = 0;

  // Free a pointer
  virtual void Deallocate(void *) = 0;

  // What is the maximum size I can allocate ?
  virtual uint64_t get_max_size() const = 0;

  virtual int PercentFree() const = 0;

  // Destructor
  virtual ~MemoryPool() {}
};

// Used by unique_ptr
template <typename T>
class Deleter {
 public:
  explicit Deleter(std::shared_ptr<MemoryPool> &mp) : mp_(mp) {}

  ~Deleter() = default;

  void operator()(T *ptr) const { mp_->Deallocate(ptr); }

 private:
  std::shared_ptr<MemoryPool> mp_;
};

Status DeMalloc(std::size_t s, void **p, bool);
}  // namespace dataset
}  // namespace mindspore

void *operator new(std::size_t, mindspore::dataset::Status *, std::shared_ptr<mindspore::dataset::MemoryPool>);

void *operator new[](std::size_t, mindspore::dataset::Status *, std::shared_ptr<mindspore::dataset::MemoryPool>);

void operator delete(void *, std::shared_ptr<mindspore::dataset::MemoryPool>);

void operator delete[](void *, std::shared_ptr<mindspore::dataset::MemoryPool>);

#endif  // DATASET_UTIL_MEMORY_POOL_H_