Method swap

core/ImageSource.cpp:17–23

}

void ImageSource::swap(ImageSource& first, ImageSource& second) {
  std::swap(first._colorType, second._colorType);
  std::swap(first._dataType, second._dataType);
  std::swap(first._spacing, second._spacing);
  std::swap(first._samplesPerPixel, second._samplesPerPixel);
  std::swap(first._isValid, second._isValid);
}

const int ImageSource::getSamplesPerPixel() const {
  if (_isValid) {