Method ResizeAndExtend

Common/Core/vtkVariantArray.cxx:819–880

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//------------------------------------------------------------------------------
vtkVariantArray::ValueType* vtkVariantArray::ResizeAndExtend(vtkIdType sz)
{
  ValueType* newArray;
  vtkIdType newSize;

  if (sz > this->Size)
  {
    // Requested size is bigger than current size.  Allocate enough
    // memory to fit the requested size and be more than double the
    // currently allocated memory.
    newSize = this->Size + sz;
  }
  else if (sz == this->Size)
  {
    // Requested size is equal to current size.  Do nothing.
    return this->Array;
  }
  else
  {
    // Requested size is smaller than current size.  Squeeze the
    // memory.
    newSize = sz;
  }

  if (newSize <= 0)
  {
    this->Initialize();
    return nullptr;
  }

  newArray = new ValueType[newSize];
  if (!newArray)
  {
    vtkErrorMacro("Cannot allocate memory\n");
    return nullptr;
  }

  if (this->Array)
  {
    // can't use memcpy here
    vtkIdType numCopy = (newSize < this->Size ? newSize : this->Size);
    for (vtkIdType i = 0; i < numCopy; ++i)
    {
      newArray[i] = this->Array[i];
    }
    if (this->DeleteFunction)
    {
      this->DeleteFunction(this->Array);
    }
  }

  if (newSize < this->Size)
  {
    this->MaxId = newSize - 1;
  }
  this->Size = newSize;
  this->Array = newArray;
  this->DeleteFunction = DefaultDeleteFunction;