lower_bound.cpp

CelIterator LayerImage::findCelIterator(frame_t frame)
{
  auto first = getCelBegin();
  auto end = getCelEnd();

  first = std::lower_bound(
    first, end, nullptr,
    [frame](Cel* cel, Cel*) -> bool {
      return cel->frame() < frame;
    });

  if (first != end && (*first)->frame() == frame)
    return first;
  else
    return end;
}