[glom] AddDel: Use std::unique_ptr<> instead of naked new.

[Murray Cumming <murrayc src gnome org>]

commit 29577255ec2f65925e54ecc5601bd56fad01b3b6
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Feb 5 11:03:21 2016 +0100

    AddDel: Use std::unique_ptr<> instead of naked new.
    
    I am not very happy with passing the raw pointer to gtkmm's
    attach_to_widget(), but that seems to be the normal use of
    unique_ptr<>::operator*() and unique_ptr<>::get(),
    as long as we don't expect the receiving API to take any
    ownership.

 glom/utility_widgets/adddel/adddel.cc |    4 +---
 glom/utility_widgets/adddel/adddel.h  |    2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/glom/utility_widgets/adddel/adddel.cc b/glom/utility_widgets/adddel/adddel.cc
index f4b3fe9..78fc149 100644
--- a/glom/utility_widgets/adddel/adddel.cc
+++ b/glom/utility_widgets/adddel/adddel.cc
@@ -75,7 +75,6 @@ AddDelColumnInfo& AddDelColumnInfo::operator=(const AddDelColumnInfo& src)
 AddDel::AddDel()
 : Gtk::Box(Gtk::ORIENTATION_VERTICAL),
   m_col_key(0),
-  m_pMenuPopup(nullptr),
   m_auto_add(true),
   m_allow_add(true),
   m_allow_delete(true)
@@ -87,7 +86,6 @@ AddDel::AddDel()
 AddDel::AddDel(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& /* builder */)
 : Gtk::Box(cobject),
   m_col_key(0),
-  m_pMenuPopup(nullptr),
   m_auto_add(true),
   m_allow_add(true),
   m_allow_delete(true)
@@ -241,7 +239,7 @@ void AddDel::setup_menu(Gtk::Widget* /* widget */)
   menu->append(_("_Edit"), "context.edit");
   menu->append(_("_Delete"), "context.delete");
 
-  m_pMenuPopup = new Gtk::Menu(menu);
+  m_pMenuPopup = std::make_unique<Gtk::Menu>(menu);
   m_pMenuPopup->attach_to_widget(*this);
 }
 
diff --git a/glom/utility_widgets/adddel/adddel.h b/glom/utility_widgets/adddel/adddel.h
index 4bcfb0d..9530d54 100644
--- a/glom/utility_widgets/adddel/adddel.h
+++ b/glom/utility_widgets/adddel/adddel.h
@@ -304,7 +304,7 @@ private:
   type_vec_strings m_vecColumnIDs; //We give each ViewColumn a special ID, so we know where they are after a 
reorder.
 
   Glib::ustring m_strTextActiveCell; //value before the change
-  Gtk::Menu* m_pMenuPopup;
+  std::unique_ptr<Gtk::Menu> m_pMenuPopup;
   Glib::RefPtr<Gio::SimpleActionGroup> m_refActionGroup;
   Glib::RefPtr<Gio::SimpleAction> m_refContextEdit, m_refContextDelete;