struct NoteData
{
	int type;
	double measurePosition;
};

struct MeasureData
{
	int beginTime;
	int sixteenths;
	vector <NoteData> note;
} measure[6];  //6 tracks

measure[0].at(3) = measure[0].at(11);  //copies measure 11 to measure 3 in track 0

//then, this does nothing:

NoteData newNote;
measure[0].at(11).note.push_back(newNote);