[libsigcplusplus] Remove signal_base::erase() and signal_impl::erase()

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 58521af49e448fd3d4b794eea19c886320ecd4a1
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Mon Jul 17 15:34:12 2017 +0200

    Remove signal_base::erase() and signal_impl::erase()
    
    They are not used in libsigc++3. Bug 784550

 sigc++/signal_base.cc |   25 +------------------------
 sigc++/signal_base.h  |   13 -------------
 2 files changed, 1 insertions(+), 37 deletions(-)
---
diff --git a/sigc++/signal_base.cc b/sigc++/signal_base.cc
index 875a3ae..5218f20 100644
--- a/sigc++/signal_base.cc
+++ b/sigc++/signal_base.cc
@@ -126,23 +126,6 @@ signal_impl::connect(slot_base&& slot_)
   return insert(slots_.end(), std::move(slot_));
 }
 
-signal_impl::iterator_type
-signal_impl::erase(iterator_type i)
-{
-  // Don't let signal_impl::notify() erase the slot. It would be more
-  // difficult to get the correct return value from signal_impl::erase().
-  const bool saved_deferred = deferred_;
-  signal_impl_holder exec(shared_from_this());
-
-  // Disconnect the slot before it is deleted.
-  // signal_impl::notify() will be called and delete the self_and_iter struct.
-  i->disconnect();
-
-  deferred_ = saved_deferred;
-
-  return slots_.erase(i);
-}
-
 void
 signal_impl::add_notification_to_iter(const signal_impl::iterator_type& iter)
 {
@@ -212,7 +195,7 @@ signal_impl::notify_self_and_iter_of_invalidated_slot(notifiable* d)
     // This is occurring during signal emission or slot erasure.
     // => sweep() will be called from ~signal_impl_holder() after signal emission.
     // This is safer because we don't have to care about our
-    // iterators in emit(), clear(), and erase().
+    // iterators in emit() and clear().
     self->deferred_ = true;
   }
 }
@@ -293,12 +276,6 @@ signal_base::insert(iterator_type i, slot_base&& slot_)
   return impl()->insert(i, std::move(slot_));
 }
 
-signal_base::iterator_type
-signal_base::erase(iterator_type i)
-{
-  return impl()->erase(i);
-}
-
 signal_base&
 signal_base::operator=(const signal_base& src)
 {
diff --git a/sigc++/signal_base.h b/sigc++/signal_base.h
index bcff3aa..9b1e815 100644
--- a/sigc++/signal_base.h
+++ b/sigc++/signal_base.h
@@ -143,12 +143,6 @@ struct SIGC_API signal_impl
    */
   iterator_type insert(iterator_type i, slot_base&& slot_);
 
-  /** Removes the slot at the given position from the list of slots.
-   * @param i An iterator pointing to the slot to be removed.
-   * @return An iterator pointing to the slot in the list after the one removed.
-   */
-  iterator_type erase(iterator_type i);
-
   /// Removes invalid slots from the list of slots.
   void sweep();
 
@@ -382,13 +376,6 @@ protected:
    */
   iterator_type insert(iterator_type i, slot_base&& slot_);
 
-  /** Removes the slot at the given position from the list of slots.
-   * Note that this function does not work during signal emission!
-   * @param i An iterator pointing to the slot to be removed.
-   * @return An iterator pointing to the slot in the list after the one removed.
-   */
-  iterator_type erase(iterator_type i);
-
   /** Returns the signal_impl object encapsulating the list of slots.
    * @return The signal_impl object encapsulating the list of slots.
    */