Issue 4550: Avoid "using namespace std;" in included files (Take 2)

lily/tuplet-iterator.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 1998--2020 Han-Wen Nienhuys <hanwen@xs4all.nl>,
                  Erik Sandberg <mandolaerik@gmail.com>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
@@ skipping 74 matching lines @@
 Tuplet_iterator::Tuplet_iterator ()
 {
   spanner_duration_ = next_split_mom_ = 0;
   synthesized_events_ = SCM_EOL;
 }
 
 Moment
 Tuplet_iterator::pending_moment () const
 {
   Moment next_mom = Music_wrapper_iterator::pending_moment ();
-  next_mom = min (next_mom, next_split_mom_);
+  next_mom = std::min (next_mom, next_split_mom_);
 
   return next_mom;
 }
 
 void
 Tuplet_iterator::process (Moment m)
 {
   if (spanner_duration_.to_bool ()
       && m.main_part_ == next_split_mom_)
     {
       descend_to_bottom_context ();
       if (tuplet_handler_.get_context ())
         create_event (STOP)->send_to_context (tuplet_handler_.get_context ());
 
       if (m.main_part_ < music_get_length ().main_part_)
         {
           spanner_duration_ =
-            min (music_get_length () - next_split_mom_, spanner_duration_);
+            std::min (music_get_length () - next_split_mom_, spanner_duration_);
           tuplet_handler_.set_context (get_outlet ());
           report_event (create_event (START));
 
           next_split_mom_ += spanner_duration_;
         }
       else
         tuplet_handler_.set_context (0);
     }
   Music_wrapper_iterator::process (m);
   if (child_iter_ && child_iter_->ok ())
@@ skipping 19 matching lines @@
 }
 
 void
 Tuplet_iterator::derived_mark () const
 {
   scm_gc_mark (synthesized_events_);
   Music_wrapper_iterator::derived_mark ();
 }
 
 IMPLEMENT_CTOR_CALLBACK (Tuplet_iterator);