Method add

3rdparty/qcustomplot/qcustomplot.h:2873–2894

*/
template <class DataType>
void QCPDataContainer<DataType>::add(const QCPDataContainer<DataType> &data)
{
  if (data.isEmpty())
    return;
  
  const int n = data.size();
  const int oldSize = size();
  
  if (oldSize > 0 && !qcpLessThanSortKey<DataType>(*constBegin(), *(data.constEnd()-1))) // prepend if new data keys are all smaller than or equal to existing ones
  {
    if (mPreallocSize < n)
      preallocateGrow(n);
    mPreallocSize -= n;
    std::copy(data.constBegin(), data.constEnd(), begin());
  } else // don't need to prepend, so append and merge if necessary
  {
    mData.resize(mData.size()+n);
    std::copy(data.constBegin(), data.constEnd(), end()-n);
    if (oldSize > 0 && !qcpLessThanSortKey<DataType>(*(constEnd()-n-1), *(constEnd()-n))) // if appended range keys aren't all greater than existing ones, merge the two partitions
      std::inplace_merge(begin(), end()-n, end(), qcpLessThanSortKey<DataType>);
  }
}

/*!
  Adds the provided data points in \a data to the current data.