static Real default_bar_spacing (Grob *, Grob *, Grob *, Moment);
static Real note_spacing (Grob *, Grob *, Grob *, Spacing_options const *, bool *);
static Real get_duration_space (Moment dur, Spacing_options const *, bool *);
static Real default_bar_spacing (Grob *, Grob *, Grob *, Moment);
static Real note_spacing (Grob *, Grob *, Grob *, Spacing_options const *, bool *);
static Real get_duration_space (Moment dur, Spacing_options const *, bool *);