constify some TempoMap functions.

2 files changed, 12 insertions, 12 deletions

diff --git a/libs/ardour/ardour/tempo.h b/libs/ardour/ardour/tempo.h
index ed3268145d..68ce3a0565 100644
--- a/libs/ardour/ardour/tempo.h
+++ b/libs/ardour/ardour/tempo.h
@@ -460,12 +460,12 @@ class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
 	framecnt_t frames_between_quarter_notes (const double start, const double end) const;
 	double     quarter_notes_between_frames (const framecnt_t start, const framecnt_t end) const;
 
-	double quarter_note_at_beat (const double beat);
-	double beat_at_quarter_note (const double beat);
+	double quarter_note_at_beat (const double beat) const;
+	double beat_at_quarter_note (const double beat) const;
 
 	/* obtain a musical subdivision via a frame position and magic note divisor.*/
-	double exact_qn_at_frame (const framepos_t& frame, const int32_t sub_num);
-	double exact_beat_at_frame (const framepos_t& frame, const int32_t sub_num);
+	double exact_qn_at_frame (const framepos_t& frame, const int32_t sub_num) const;
+	double exact_beat_at_frame (const framepos_t& frame, const int32_t sub_num) const;
 
 	Tempo tempo_at_frame (const framepos_t& frame) const;
 	framepos_t frame_at_tempo (const Tempo& tempo) const;
@@ -532,8 +532,8 @@ private:
 	bool solve_map_minute (Metrics& metrics, MeterSection* section, const double& minute);
 	bool solve_map_bbt (Metrics& metrics, MeterSection* section, const Timecode::BBT_Time& bbt);
 
-	double exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num);
-	double exact_qn_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num);
+	double exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num) const;
+	double exact_qn_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num) const;
 
 	double minute_at_frame (const framepos_t frame) const;
 	framepos_t frame_at_minute (const double minute) const;
diff --git a/libs/ardour/tempo.cc b/libs/ardour/tempo.cc
index 64bcd58f03..41c08ae675 100644
--- a/libs/ardour/tempo.cc
+++ b/libs/ardour/tempo.cc
@@ -2326,7 +2326,7 @@ TempoMap::minute_at_quarter_note_locked (const Metrics& metrics, const double qu
  *
  */
 double
-TempoMap::quarter_note_at_beat (const double beat)
+TempoMap::quarter_note_at_beat (const double beat) const
 {
 	Glib::Threads::RWLock::ReaderLock lm (lock);
 
@@ -2351,7 +2351,7 @@ TempoMap::quarter_note_at_beat_locked (const Metrics& metrics, const double beat
  *
  */
 double
-TempoMap::beat_at_quarter_note (const double quarter_note)
+TempoMap::beat_at_quarter_note (const double quarter_note) const
 {
 	Glib::Threads::RWLock::ReaderLock lm (lock);
 
@@ -3409,7 +3409,7 @@ TempoMap::gui_dilate_tempo (TempoSection* ts, const framepos_t& frame, const fra
  * This function is sensitive to tempo and meter.
  */
 double
-TempoMap::exact_beat_at_frame (const framepos_t& frame, const int32_t sub_num)
+TempoMap::exact_beat_at_frame (const framepos_t& frame, const int32_t sub_num) const
 {
 	Glib::Threads::RWLock::ReaderLock lm (lock);
 
@@ -3417,7 +3417,7 @@ TempoMap::exact_beat_at_frame (const framepos_t& frame, const int32_t sub_num)
 }
 
 double
-TempoMap::exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t divisions)
+TempoMap::exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t divisions) const
 {
 	return beat_at_pulse_locked (_metrics, exact_qn_at_frame_locked (metrics, frame, divisions) / 4.0);
 }
@@ -3445,7 +3445,7 @@ TempoMap::exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t&
  * This function is tempo-sensitive.
  */
 double
-TempoMap::exact_qn_at_frame (const framepos_t& frame, const int32_t sub_num)
+TempoMap::exact_qn_at_frame (const framepos_t& frame, const int32_t sub_num) const
 {
 	Glib::Threads::RWLock::ReaderLock lm (lock);
 
@@ -3453,7 +3453,7 @@ TempoMap::exact_qn_at_frame (const framepos_t& frame, const int32_t sub_num)
 }
 
 double
-TempoMap::exact_qn_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num)
+TempoMap::exact_qn_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num) const
 {
 	double qn = quarter_note_at_minute_locked (metrics, minute_at_frame (frame));