[libsigcplusplus] signal_base.h: Move temp_slot_list to signal.h

[Murray Cumming <murrayc src gnome org>]

commit d8d5e09979104b89efa42d08c6401028bb4025a3
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Apr 13 12:49:17 2016 +0200

    signal_base.h: Move temp_slot_list to signal.h
    
    Because that is the only place where it is used.

 sigc++/signal.h      |   31 +++++++++++++++++++++++++++++++
 sigc++/signal_base.h |   32 --------------------------------
 2 files changed, 31 insertions(+), 32 deletions(-)
---
diff --git a/sigc++/signal.h b/sigc++/signal.h
index e383330..74b0b17 100644
--- a/sigc++/signal.h
+++ b/sigc++/signal.h
@@ -560,6 +560,37 @@ private:
   mutable bool invoked_;
 };
 
+/** Temporary slot list used during signal emission.
+ *  Through evolution this class is slightly misnamed.  It is now
+ *  an index into the slot_list passed into it.  It simply keeps track
+ *  of where the end of this list was at construction, and pretends that's
+ *  the end of your list.  This way you may connect during emission without
+ *  inadvertently entering an infinite loop, as well as make other
+ *  modifications to the slot_list at your own risk.
+ */
+struct temp_slot_list
+{
+  using slot_list = signal_impl::slot_list;
+  using iterator = signal_impl::iterator_type;
+  using const_iterator = signal_impl::const_iterator_type;
+
+  temp_slot_list(slot_list& slots) : slots_(slots)
+  {
+    placeholder = slots_.insert(slots_.end(), slot_base());
+  }
+
+  ~temp_slot_list() { slots_.erase(placeholder); }
+
+  iterator begin() { return slots_.begin(); }
+  iterator end() { return placeholder; }
+  const_iterator begin() const { return slots_.begin(); }
+  const_iterator end() const { return placeholder; }
+
+private:
+  slot_list& slots_;
+  slot_list::iterator placeholder;
+};
+
 /** Abstracts signal emission.
  * This template implements the emit() function of signal_with_accumulator.
  * Template specializations are available to optimize signal
diff --git a/sigc++/signal_base.h b/sigc++/signal_base.h
index 8571154..c9d3172 100644
--- a/sigc++/signal_base.h
+++ b/sigc++/signal_base.h
@@ -212,38 +212,6 @@ struct SIGC_API signal_exec
 protected:
   /// The parent sigc::signal_impl object.
   signal_impl* sig_;
-
-};
-
-/** Temporary slot list used during signal emission.
- *  Through evolution this class is slightly misnamed.  It is now
- *  an index into the slot_list passed into it.  It simply keeps track
- *  of where the end of this list was at construction, and pretends that's
- *  the end of your list.  This way you may connect during emission without
- *  inadvertently entering an infinite loop, as well as make other
- *  modifications to the slot_list at your own risk.
- */
-struct temp_slot_list
-{
-  using slot_list = signal_impl::slot_list;
-  using iterator = signal_impl::iterator_type;
-  using const_iterator = signal_impl::const_iterator_type;
-
-  temp_slot_list(slot_list& slots) : slots_(slots)
-  {
-    placeholder = slots_.insert(slots_.end(), slot_base());
-  }
-
-  ~temp_slot_list() { slots_.erase(placeholder); }
-
-  iterator begin() { return slots_.begin(); }
-  iterator end() { return placeholder; }
-  const_iterator begin() const { return slots_.begin(); }
-  const_iterator end() const { return placeholder; }
-
-private:
-  slot_list& slots_;
-  slot_list::iterator placeholder;
 };
 
 } /* namespace internal */