allocator.hpp

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// Copyright (C) 2020-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include <cstddef>

namespace intel {
namespace hexl {

struct AllocatorBase {
  virtual ~AllocatorBase() noexcept {}

  virtual void* allocate(size_t bytes_count) = 0;

  virtual void deallocate(void* p, size_t n) = 0;
};

template <class AllocatorImpl>
struct AllocatorInterface : public AllocatorBase {
  void* allocate(size_t bytes_count) override {
    return static_cast<AllocatorImpl*>(this)->allocate_impl(bytes_count);
  }

  void deallocate(void* p, size_t n) override {
    static_cast<AllocatorImpl*>(this)->deallocate_impl(p, n);
  }

 private:
  // in case AllocatorImpl doesn't provide implementations, use default null
  // behavior
  void* allocate_impl(size_t bytes_count) {
    HEXL_UNUSED(bytes_count);
    return nullptr;
  }
  void deallocate_impl(void* p, size_t n) {
    HEXL_UNUSED(p);
    HEXL_UNUSED(n);
  }
};
}  // namespace hexl
}  // namespace intel