be/src/vec/common/allocator_fwd.h

// Licensed to the Apache Software Foundation (ASF) under one
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// to you 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,
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// under the License.
// This file is copied from
// https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/Allocator_fwd.h
// and modified by Doris

/**
  * This file provides forward declarations for Allocator.
  */
#pragma once

#include <cstddef>
namespace doris {
class DefaultMemoryAllocator;

template <bool clear_memory_, bool mmap_populate = false, bool use_mmap = false,
          typename MemoryAllocator = DefaultMemoryAllocator, bool check_and_tracking_memory = true>
class Allocator;

template <typename Base, size_t N = 64, size_t Alignment = 1>
class AllocatorWithStackMemory;
} // namespace doris