_track(t, e),
_offset(_track ? o : 0),
_path((_track && _offset) ? _track->get_active_path() : -1)
-{ }
+{
+ validate();
+}
TrackOffsetIter::TrackOffsetIter(Track *t, unsigned e, unsigned p, float o):
_track(t, e),
_offset(o),
_path(p)
-{ }
+{
+ validate();
+}
TrackOffsetIter::TrackOffsetIter(const TrackIter &t, float o):
_track(t),
_offset(_track ? o : 0),
_path((_track && _offset) ? _track->get_active_path() : -1)
-{ }
+{
+ validate();
+}
TrackOffsetIter::TrackOffsetIter(const TrackIter &t, unsigned p, float o):
_track(t),
_offset(o),
_path(p)
-{ }
+{
+ validate();
+}
+
+void TrackOffsetIter::validate()
+{
+ if(!_track)
+ return;
+
+ if(_offset<0)
+ throw invalid_argument("TrackOffsetIter::TrackOffsetIter");
+
+ if(_path>=0)
+ {
+ if(!_track.endpoint().has_path(_path))
+ throw invalid_argument("TrackOffsetIter::TrackOffsetIter");
+ if(_offset>_track->get_type().get_path_length(_path))
+ throw invalid_argument("TrackOffsetIter::TrackOffsetIter");
+ }
+}
BlockIter TrackOffsetIter::block_iter() const
{
{
if(p<0)
p = (r ? r->get_path(*t) : t->get_active_path());
+ p = t->get_type().coerce_path(t.entry(), p);
float length = t->get_type().get_path_length(p);
if(o<length)