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generator/parser/rxx_allocator.h  view on Meta::CPAN

  static const size_type max_block_count = size_type(-1);
  static const size_type _S_block_size = 1 << 16; // 64K

  rxx_allocator() {
    init();
  }

  rxx_allocator(const rxx_allocator &/*__o*/) {
    init();
  }

  ~rxx_allocator() {
    for (size_type index = 0; index < _M_block_index + 1; ++index)
      delete[] _M_storage[index];

    ::free(_M_storage);
  }

  pointer address(reference __val) { return &__val; }
  const_pointer address(const_reference __val) const { return &__val; }

  /**Allocates @p __n elements continuosly in the pool. Warning! no
  check is done to check if the size of those @p __n elements
  fit into the block. You should assure you do not allocate more
  than the size of a block.*/
  pointer allocate(size_type __n, const void* = 0) {
    const size_type bytes = __n * sizeof(_Tp);

    if (_M_current_block == 0
	|| _S_block_size < _M_current_index + bytes)
      {
	++_M_block_index;

	_M_storage = reinterpret_cast<char**>
	  (::realloc(_M_storage, sizeof(char*) * (1 + _M_block_index)));

	_M_current_block = _M_storage[_M_block_index] = reinterpret_cast<char*>
	  (new char[_S_block_size]);

	::memset(_M_current_block, 0, _S_block_size);
	_M_current_index = 0;
      }

    pointer p = reinterpret_cast<pointer>
      (_M_current_block + _M_current_index);

    _M_current_index += bytes;

    return p;
  }

  /**Deallocate does nothing in this implementation.*/
  void deallocate(pointer /*__p*/, size_type /*__n*/) {}

  size_type max_size() const { return size_type(-1) / sizeof(_Tp); }

  void construct(pointer __p, const_reference __val) { new (__p) _Tp(__val); }
  void destroy(pointer __p) { __p->~_Tp(); }

  template <class _Tp1> struct rebind {
    typedef rxx_allocator<_Tp1> other;
  };

private:

  void init()
  {
    _M_block_index = max_block_count;
    _M_current_index = 0;
    _M_storage = 0;
    _M_current_block = 0;
  }

  template <class _Tp1> rxx_allocator(const rxx_allocator<_Tp1> &__o) {}

private:
  size_type _M_block_index;
  size_type _M_current_index;
  char *_M_current_block;
  char **_M_storage;
};

#endif // RXX_ALLOCATOR_H