Yield left-to-right klass instances in expr.
Include grace leaves before main leaves.
Include grace leaves after main leaves.
abjad> t = Voice(construct.scale(4))
abjad> Beam(t[:])
abjad> notes = construct.scale(4, Rational(1, 16))
abjad> t[1].grace.before.extend(notes[:2])
abjad> t[1].grace.after.extend(notes[2:])
abjad> print t.format
\new Voice {
c'8 [
\grace {
c'16
d'16
}
\afterGrace
d'8
{
e'16
f'16
}
e'8
f'8 ]
}
abjad> for x in iterate.grace(t, Note):
... x
...
Note(c', 8)
Note(c', 16)
Note(d', 16)
Note(d', 8)
Note(e', 16)
Note(f', 16)
Note(e', 8)
Note(f', 8)
Note
This naive iteration ignores threads.