alloc_type.hpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ALLOC_TYPE_HPP
#define ALLOC_TYPE_HPP
 
#include "alloc_func.hpp"
 
template <typename T>
class ReusableBuffer {
private:
  T *buffer;    
  size_t count; 
 
public:
  ReusableBuffer() : buffer(nullptr), count(0) {}
  ~ReusableBuffer() { free(this->buffer); }
 
  T *Allocate(size_t count)
  {
    if (this->count < count) {
      free(this->buffer);
      this->buffer = MallocT<T>(count);
      this->count = count;
    }
    return this->buffer;
  }
 
  T *ZeroAllocate(size_t count)
  {
    if (this->count < count) {
      free(this->buffer);
      this->buffer = CallocT<T>(count);
      this->count = count;
    } else {
      memset(this->buffer, 0, sizeof(T) * count);
    }
    return this->buffer;
  }
 
  inline const T *GetBuffer() const
  {
    return this->buffer;
  }
};
 
class ZeroedMemoryAllocator
{
public:
  ZeroedMemoryAllocator() {}
  virtual ~ZeroedMemoryAllocator() = default;
 
  inline void *operator new(size_t size) { return CallocT<uint8_t>(size); }
 
  inline void *operator new[](size_t size) { return CallocT<uint8_t>(size); }
 
  inline void operator delete(void *ptr) { free(ptr); }
 
  inline void operator delete[](void *ptr) { free(ptr); }
};
 
#endif /* ALLOC_TYPE_HPP */