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[gtkmm/wip/dboles/make_managed-3] object: Add Gtk::make_managed<T>(args...) helper

commit aac8dcd0e0dd79f598009f926dd289e0e55b48cc
Author: Daniel Boles <dboles src gmail com>
Date:   Sun Oct 7 13:09:49 2018 +0100

    object: Add Gtk::make_managed<T>(args...) helper
    
    To avoid the discouraged pattern of manually writing `new` and get
    tidier syntax, follow the example of std::make_(unique|shared)() by
    adding a new helper function that both constructs and manages a widget
    in one call. The user will not need to `new` and can user fewer parens.
    
      auto button = Gtk::manage(new Gtk::Button("_Hi", true));
    
    becomes
    
      auto button = Gtk::make_managed<Gtk::Button>("_Hi", true);
    
    Switch to make_managed() in tests and demo, albeit nowhere else (yet?).
    
    https://gitlab.gnome.org/GNOME/gtkmm/issues/33

 demos/gtk-demo/demowindow.cc                      |  2 +-
 demos/gtk-demo/example_appwindow.cc               | 10 +++++-----
 demos/gtk-demo/example_buttonbox.cc               | 14 +++++++-------
 demos/gtk-demo/example_change_display.cc          |  4 ++--
 demos/gtk-demo/example_dialog.cc                  |  2 +-
 demos/gtk-demo/example_flowbox.cc                 |  4 ++--
 demos/gtk-demo/example_iconbrowser.cc             |  2 +-
 demos/gtk-demo/example_images.cc                  |  4 ++--
 demos/gtk-demo/example_menus.cc                   | 20 ++++++++++----------
 demos/gtk-demo/example_panes.cc                   | 10 +++++-----
 demos/gtk-demo/example_sizegroup.cc               |  4 ++--
 demos/gtk-demo/example_stacksidebar.cc            |  4 ++--
 demos/gtk-demo/example_textview.cc                | 18 +++++++++---------
 demos/gtk-demo/example_treeview_editable_cells.cc |  4 ++--
 gtk/gtkmm/object.h                                | 21 +++++++++++++++++++++
 tests/child_widget_managed/main.cc                |  2 +-
 tests/delete_cpp_child/main.cc                    |  8 +++-----
 tests/dialog/main.cc                              |  8 +++-----
 tests/dialog_deletethis/main.cc                   |  2 +-
 19 files changed, 80 insertions(+), 63 deletions(-)
---
diff --git a/demos/gtk-demo/demowindow.cc b/demos/gtk-demo/demowindow.cc
index a758819d..d6c41133 100644
--- a/demos/gtk-demo/demowindow.cc
+++ b/demos/gtk-demo/demowindow.cc
@@ -143,7 +143,7 @@ void DemoWindow::fill_tree()
     }
   }
 
-  Gtk::CellRendererText* pCell = Gtk::manage(new Gtk::CellRendererText());
+  Gtk::CellRendererText* pCell = Gtk::make_managed<Gtk::CellRendererText>();
   pCell->property_style() = Pango::STYLE_ITALIC;
 
   Gtk::TreeViewColumn* pColumn = new Gtk::TreeViewColumn("Widget (double click for demo)", *pCell);
diff --git a/demos/gtk-demo/example_appwindow.cc b/demos/gtk-demo/example_appwindow.cc
index be6c4e5e..289d18e4 100644
--- a/demos/gtk-demo/example_appwindow.cc
+++ b/demos/gtk-demo/example_appwindow.cc
@@ -46,7 +46,7 @@ Example_AppWindow::Example_AppWindow()
     using namespace Gtk::Menu_Helpers;
 
     //File menu:
-    Gtk::Menu* pMenuFile = Gtk::manage( new Gtk::Menu() );
+    Gtk::Menu* pMenuFile = Gtk::make_managed<Gtk::Menu>();
     MenuList& list_file = pMenuFile->items();
     list_file.push_back( MenuElem("_New", "<control>N", sigc::mem_fun(*this, 
&Example_AppWindow::on_menu_item)) );
     list_file.push_back( MenuElem("_Open", "<control>O", sigc::mem_fun(*this, 
&Example_AppWindow::on_menu_item)) );
@@ -56,11 +56,11 @@ Example_AppWindow::Example_AppWindow()
     list_file.push_back( MenuElem("_Quit", "<control>Q", sigc::mem_fun(*this, 
&Example_AppWindow::on_menu_item)) );
 
     //Preferences menu:
-    Gtk::Menu* pMenuPreferences = Gtk::manage( new Gtk::Menu() );
+    Gtk::Menu* pMenuPreferences = Gtk::make_managed<Gtk::Menu>();
     MenuList& list_preferences = pMenuPreferences->items();
 
     // Create a submenu
-    Gtk::Menu* pMenuSub_Color = Gtk::manage( new Gtk::Menu());
+    Gtk::Menu* pMenuSub_Color = Gtk::make_managed<Gtk::Menu>();
     MenuList& list_sub = pMenuSub_Color->items();
     list_sub.push_back( MenuElem("_Red", sigc::mem_fun(*this, &Example_AppWindow::on_menu_item)) );
     list_sub.push_back( MenuElem("_Green", sigc::mem_fun(*this, &Example_AppWindow::on_menu_item)) );
@@ -69,7 +69,7 @@ Example_AppWindow::Example_AppWindow()
     list_preferences.push_back( MenuElem("_Color", *pMenuSub_Color) );
 
     // Create a submenu
-    Gtk::Menu* pMenuSub_Shape = Gtk::manage( new Gtk::Menu());
+    Gtk::Menu* pMenuSub_Shape = Gtk::make_managed<Gtk::Menu>();
     list_sub = pMenuSub_Shape->items();
     list_sub.push_back( MenuElem("_Square", sigc::mem_fun(*this, &Example_AppWindow::on_menu_item)) );
     list_sub.push_back( MenuElem("_Rectangle", sigc::mem_fun(*this, &Example_AppWindow::on_menu_item)) );
@@ -78,7 +78,7 @@ Example_AppWindow::Example_AppWindow()
     list_preferences.push_back( MenuElem("_Shape", *pMenuSub_Shape) );
 
     //Help menu:
-    Gtk::Menu* pMenuHelp = Gtk::manage( new Gtk::Menu() );
+    Gtk::Menu* pMenuHelp = Gtk::make_managed<Gtk::Menu>();
     MenuList& list_help = pMenuHelp->items();
     list_help.push_back( MenuElem("_About", sigc::mem_fun(*this, &Example_AppWindow::on_menu_item)) );
 
diff --git a/demos/gtk-demo/example_buttonbox.cc b/demos/gtk-demo/example_buttonbox.cc
index bbc6163e..809e820e 100644
--- a/demos/gtk-demo/example_buttonbox.cc
+++ b/demos/gtk-demo/example_buttonbox.cc
@@ -69,13 +69,13 @@ Example_ButtonBox::~Example_ButtonBox()
 
 Gtk::Frame* Example_ButtonBox::create_button_box(bool horizontal, const Glib::ustring& title, gint  spacing, 
Gtk::ButtonBoxStyle layout)
 {
-  Gtk::Frame* pFrame = Gtk::manage(new Gtk::Frame(title));
+  Gtk::Frame* pFrame = Gtk::make_managed<Gtk::Frame>(title);
 
   Gtk::ButtonBox* pButtonBox = nullptr;
   if (horizontal)
-    pButtonBox = Gtk::manage(new Gtk::ButtonBox(Gtk::ORIENTATION_HORIZONTAL));
+    pButtonBox = Gtk::make_managed<Gtk::ButtonBox>(Gtk::ORIENTATION_HORIZONTAL);
   else
-    pButtonBox = Gtk::manage(new Gtk::ButtonBox(Gtk::ORIENTATION_VERTICAL));
+    pButtonBox = Gtk::make_managed<Gtk::ButtonBox>(Gtk::ORIENTATION_VERTICAL);
 
   pButtonBox->set_border_width(5);
   pFrame->add(*pButtonBox);
@@ -83,14 +83,14 @@ Gtk::Frame* Example_ButtonBox::create_button_box(bool horizontal, const Glib::us
   pButtonBox->set_layout(layout);
   pButtonBox->set_spacing(spacing);
 
-  Gtk::Button* pButton = Gtk::manage(new Gtk::Button("_OK", true));
+  Gtk::Button* pButton = Gtk::make_managed<Gtk::Button>("_OK", true);
   pButtonBox->add(*pButton);
 
-  pButton = Gtk::manage(new Gtk::Button("_Cancel", true));
+  pButton = Gtk::make_managed<Gtk::Button>("_Cancel", true);
   pButtonBox->add(*pButton);
 
-  pButton = Gtk::manage(new Gtk::Button());
-  Gtk::Image* pImage = Gtk::manage(new Gtk::Image());
+  pButton = Gtk::make_managed<Gtk::Button>();
+  Gtk::Image* pImage = Gtk::make_managed<Gtk::Image>();
   pImage->set_from_icon_name("help-browser", Gtk::ICON_SIZE_BUTTON);
   pButton->add(*pImage);
   pButtonBox->add(*pButton);
diff --git a/demos/gtk-demo/example_change_display.cc b/demos/gtk-demo/example_change_display.cc
index a5f0fbf0..e5510d43 100644
--- a/demos/gtk-demo/example_change_display.cc
+++ b/demos/gtk-demo/example_change_display.cc
@@ -147,11 +147,11 @@ Example_ChangeDisplay::~Example_ChangeDisplay()
 
 void Example_ChangeDisplay::setup_frame(Gtk::Frame& frame, Gtk::TreeView& treeview, Gtk::Box& buttonbox)
 {
-  Gtk::Box* pHBox = Gtk::manage( new Gtk::Box(Gtk::ORIENTATION_HORIZONTAL, 8) );
+  Gtk::Box* pHBox = Gtk::make_managed<Gtk::Box>(Gtk::ORIENTATION_HORIZONTAL, 8);
   pHBox->set_border_width(8);
   frame.add(*pHBox);
 
-  Gtk::ScrolledWindow* pScrolledWindow = Gtk::manage( new Gtk::ScrolledWindow() );
+  Gtk::ScrolledWindow* pScrolledWindow = Gtk::make_managed<Gtk::ScrolledWindow>();
   pScrolledWindow->set_policy(Gtk::POLICY_NEVER, Gtk::POLICY_AUTOMATIC);
   pScrolledWindow->set_shadow_type(Gtk::SHADOW_IN);
   pHBox->pack_start(*pScrolledWindow);
diff --git a/demos/gtk-demo/example_dialog.cc b/demos/gtk-demo/example_dialog.cc
index 8e3e7076..8b960fa9 100644
--- a/demos/gtk-demo/example_dialog.cc
+++ b/demos/gtk-demo/example_dialog.cc
@@ -79,7 +79,7 @@ Example_Dialog::Example_Dialog()
   m_VBox.pack_start(m_HBox, Gtk::PACK_SHRINK);
   m_Button_Message.signal_clicked().connect(sigc::mem_fun(*this, &Example_Dialog::on_button_message));
   m_HBox.pack_start(m_Button_Message, Gtk::PACK_SHRINK);
-  m_VBox.pack_start(*(Gtk::manage(new Gtk::Separator(Gtk::ORIENTATION_HORIZONTAL))), Gtk::PACK_SHRINK);
+  m_VBox.pack_start(*Gtk::make_managed<Gtk::Separator>(Gtk::ORIENTATION_HORIZONTAL), Gtk::PACK_SHRINK);
 
 
   /* Interactive dialog*/
diff --git a/demos/gtk-demo/example_flowbox.cc b/demos/gtk-demo/example_flowbox.cc
index 350220e3..6fe779a4 100644
--- a/demos/gtk-demo/example_flowbox.cc
+++ b/demos/gtk-demo/example_flowbox.cc
@@ -71,8 +71,8 @@ Example_FlowBox::~Example_FlowBox()
 
 Gtk::Button* Example_FlowBox::create_color_swatch(int swatch_i)
 {
-  Gtk::DrawingArea* drawing_area = Gtk::manage(new Gtk::DrawingArea());
-  Gtk::Button* color_swatch = Gtk::manage(new Gtk::Button());
+  Gtk::DrawingArea* drawing_area = Gtk::make_managed<Gtk::DrawingArea>();
+  Gtk::Button* color_swatch = Gtk::make_managed<Gtk::Button>();
 
   drawing_area->set_size_request(24, 24);
 
diff --git a/demos/gtk-demo/example_iconbrowser.cc b/demos/gtk-demo/example_iconbrowser.cc
index c8fd0a7e..ae2b818f 100644
--- a/demos/gtk-demo/example_iconbrowser.cc
+++ b/demos/gtk-demo/example_iconbrowser.cc
@@ -831,7 +831,7 @@ void Example_IconBrowser::populate()
 void Example_IconBrowser::add_context(const Glib::ustring& id,
   const Glib::ustring& name, const Glib::ustring& description)
 {
-  IconContextLabel* row = Gtk::manage(new IconContextLabel(id, name));
+  IconContextLabel* row = Gtk::make_managed<IconContextLabel>(id, name);
   row->show();
   row->property_margin() = 10;
   m_context_list.append(*row);
diff --git a/demos/gtk-demo/example_images.cc b/demos/gtk-demo/example_images.cc
index 53fe4c5b..2cbd4081 100644
--- a/demos/gtk-demo/example_images.cc
+++ b/demos/gtk-demo/example_images.cc
@@ -66,7 +66,7 @@ Example_Images::Example_Images()
   m_Frame_Image.set_valign(Gtk::ALIGN_CENTER);
   m_VBox.pack_start(m_Frame_Image, Gtk::PACK_SHRINK);
 
-  Gtk::Image* pImage = Gtk::manage(new Gtk::Image());
+  Gtk::Image* pImage = Gtk::make_managed<Gtk::Image>();
   pImage->set_from_resource("/images/gtk-logo-rgb.gif");
   m_Frame_Image.add(*pImage);
 
@@ -81,7 +81,7 @@ Example_Images::Example_Images()
   m_Frame_Animation.set_valign(Gtk::ALIGN_CENTER);
   m_VBox.pack_start(m_Frame_Animation, Gtk::PACK_SHRINK);
 
-  pImage = Gtk::manage(new Gtk::Image());
+  pImage = Gtk::make_managed<Gtk::Image>();
   pImage->set_from_resource("/images/floppybuddy.gif");
   m_Frame_Animation.add(*pImage);
 
diff --git a/demos/gtk-demo/example_menus.cc b/demos/gtk-demo/example_menus.cc
index 9a5be0ae..e23b0eea 100644
--- a/demos/gtk-demo/example_menus.cc
+++ b/demos/gtk-demo/example_menus.cc
@@ -67,17 +67,17 @@ Example_Menus::Example_Menus()
 
   {
     //Note:: It's generally easier to use the Gtk::Builder API.
-    Gtk::MenuItem* pMenuItem = Gtk::manage(new Gtk::MenuItem("test\nline2"));
+    Gtk::MenuItem* pMenuItem = Gtk::make_managed<Gtk::MenuItem>("test\nline2");
     pMenuItem->set_submenu( *(create_menu(2)) );
     m_MenuBar.append(*pMenuItem);
     pMenuItem->show();
 
-    pMenuItem = Gtk::manage(new Gtk::MenuItem("foo"));
+    pMenuItem = Gtk::make_managed<Gtk::MenuItem>("foo");
     pMenuItem->set_submenu( *(create_menu(3)) );
     m_MenuBar.append(*pMenuItem);
     pMenuItem->show();
 
-    pMenuItem = Gtk::manage(new Gtk::MenuItem("bar"));
+    pMenuItem = Gtk::make_managed<Gtk::MenuItem>("bar");
     pMenuItem->set_submenu( *(create_menu(4)) );
     m_MenuBar.append(*pMenuItem);
     pMenuItem->show();
@@ -93,16 +93,16 @@ Example_Menus::Example_Menus()
     auto pMenu = create_menu(1);
     pMenu->set_accel_group(accel_group);
 
-    Gtk::MenuItem* pMenuItem = Gtk::manage(new Gtk::SeparatorMenuItem());
+    Gtk::MenuItem* pMenuItem = Gtk::make_managed<Gtk::SeparatorMenuItem>();
     pMenu->append(*pMenuItem);
     pMenuItem->show();
 
-    pMenuItem = Gtk::manage(new Gtk::MenuItem("accel"));
+    pMenuItem = Gtk::make_managed<Gtk::MenuItem>("accel");
     pMenuItem->set_submenu(*pMenu);
     m_MenuBar.append(*pMenuItem);
     pMenuItem->show();
 
-    pMenuItem = Gtk::manage(new Gtk::CheckMenuItem("Accelerate Me"));
+    pMenuItem = Gtk::make_managed<Gtk::CheckMenuItem>("Accelerate Me");
     pMenuItem->add_accelerator("activate", accel_group, GDK_KEY_F1,
       Gdk::ModifierType(0), Gtk::ACCEL_VISIBLE);
     pMenu->append(*pMenuItem);
@@ -110,7 +110,7 @@ Example_Menus::Example_Menus()
     pMenuItem->signal_activate().connect(
       sigc::bind(sigc::mem_fun(*this, &Example_Menus::on_item_activated), "F1"));
 
-    pMenuItem = Gtk::manage(new Gtk::CheckMenuItem("Accelerator Locked"));
+    pMenuItem = Gtk::make_managed<Gtk::CheckMenuItem>("Accelerator Locked");
     pMenu->append(*pMenuItem);
     pMenuItem->add_accelerator("activate", accel_group, GDK_KEY_F2,
       Gdk::ModifierType(0), Gtk::ACCEL_VISIBLE | Gtk::ACCEL_LOCKED);
@@ -118,7 +118,7 @@ Example_Menus::Example_Menus()
     pMenuItem->signal_activate().connect(
       sigc::bind(sigc::mem_fun(*this, &Example_Menus::on_item_activated), "F2"));
 
-    pMenuItem = Gtk::manage(new Gtk::CheckMenuItem("Accelerator Frozen"));
+    pMenuItem = Gtk::make_managed<Gtk::CheckMenuItem>("Accelerator Frozen");
     pMenu->append(*pMenuItem);
     pMenuItem->add_accelerator("activate", accel_group, GDK_KEY_F3,
       Gdk::ModifierType(0), Gtk::ACCEL_VISIBLE);
@@ -150,7 +150,7 @@ Gtk::Menu* Example_Menus::create_menu(gint depth)
   if (depth < 1)
     return nullptr;
 
-  Gtk::Menu* pMenu = Gtk::manage(new Gtk::Menu());
+  Gtk::Menu* pMenu = Gtk::make_managed<Gtk::Menu>();
 
   {
     Gtk::RadioMenuItem::Group radiogroup;
@@ -160,7 +160,7 @@ Gtk::Menu* Example_Menus::create_menu(gint depth)
       char buf[32];
       sprintf(buf, "item %2d - %d", depth, j);
 
-      Gtk::MenuItem* pMenuItem = Gtk::manage(new Gtk::RadioMenuItem(radiogroup, buf));
+      Gtk::MenuItem* pMenuItem = Gtk::make_managed<Gtk::RadioMenuItem>(radiogroup, buf);
       pMenu->append(*pMenuItem);
       pMenuItem->show();
 
diff --git a/demos/gtk-demo/example_panes.cc b/demos/gtk-demo/example_panes.cc
index c49d88b0..1c26bb2b 100644
--- a/demos/gtk-demo/example_panes.cc
+++ b/demos/gtk-demo/example_panes.cc
@@ -63,7 +63,7 @@ Example_Panes::Example_Panes()
   pHPaned->add1(*Gtk::manage(pFrame1));
   pFrame1->set_shadow_type(Gtk::SHADOW_IN);
   pFrame1->set_size_request(60, 60);
-  pFrame1->add(*Gtk::manage(new Gtk::Button("_Hi there", true)));
+  pFrame1->add(*Gtk::make_managed<Gtk::Button>("_Hi there", true));
 
   Gtk::Frame *const pFrame2 = new Gtk::Frame();
   pHPaned->add2(*Gtk::manage(pFrame2));
@@ -76,8 +76,8 @@ Example_Panes::Example_Panes()
   pFrame3->set_size_request(60, 80);
 
   // Now create check buttons to control sizing
-  pVBox->pack_start(*Gtk::manage(new PaneOptions(*pHPaned, "Horizontal", "Left", "Right")), 
Gtk::PACK_SHRINK);
-  pVBox->pack_start(*Gtk::manage(new PaneOptions(*pVPaned, "Vertical", "Top", "Bottom")),   
Gtk::PACK_SHRINK);
+  pVBox->pack_start(*Gtk::make_managed<PaneOptions>(*pHPaned, "Horizontal", "Left", "Right"), 
Gtk::PACK_SHRINK);
+  pVBox->pack_start(*Gtk::make_managed<PaneOptions>(*pVPaned, "Vertical", "Top", "Bottom"),   
Gtk::PACK_SHRINK);
 
   show_all();
 }
@@ -101,8 +101,8 @@ PaneOptions::PaneOptions(Gtk::Paned& paned, const Glib::ustring& frame_label,
   Gtk::Grid *const pGrid = new Gtk::Grid();
   add(*Gtk::manage(pGrid));
 
-  pGrid->attach(*Gtk::manage(new Gtk::Label(label1)), 0, 0, 1, 1);
-  pGrid->attach(*Gtk::manage(new Gtk::Label(label2)), 1, 0, 1, 1);
+  pGrid->attach(*Gtk::make_managed<Gtk::Label>(label1), 0, 0, 1, 1);
+  pGrid->attach(*Gtk::make_managed<Gtk::Label>(label2), 1, 0, 1, 1);
 
   pGrid->attach(m_CheckButton_resize1, 0, 1, 1, 1);
   pGrid->attach(m_CheckButton_shrink1, 0, 2, 1, 1);
diff --git a/demos/gtk-demo/example_sizegroup.cc b/demos/gtk-demo/example_sizegroup.cc
index aa3e9040..065313c7 100644
--- a/demos/gtk-demo/example_sizegroup.cc
+++ b/demos/gtk-demo/example_sizegroup.cc
@@ -133,7 +133,7 @@ void Example_SizeGroup::add_row(Gtk::Grid& grid, int row,
                                 const Glib::ustring& label_text,
                                 const std::list<Glib::ustring>& options)
 {
-  Gtk::Label* pLabel = Gtk::manage(new Gtk::Label(label_text, Gtk::ALIGN_START, Gtk::ALIGN_END, true));
+  Gtk::Label* pLabel = Gtk::make_managed<Gtk::Label>(label_text, Gtk::ALIGN_START, Gtk::ALIGN_END, true);
 
   grid.attach(*pLabel, 0, row, 1, 1);
   pLabel->set_hexpand();
@@ -149,7 +149,7 @@ void Example_SizeGroup::add_row(Gtk::Grid& grid, int row,
  */
 Gtk::ComboBoxText* Example_SizeGroup::create_combobox(const std::list<Glib::ustring>& strings)
 {
-  Gtk::ComboBoxText* pCombo = Gtk::manage( new Gtk::ComboBoxText() );
+  Gtk::ComboBoxText* pCombo = Gtk::make_managed<Gtk::ComboBoxText>();
 
   for(const auto& str : strings)
   {
diff --git a/demos/gtk-demo/example_stacksidebar.cc b/demos/gtk-demo/example_stacksidebar.cc
index 8fca65a2..4120839f 100644
--- a/demos/gtk-demo/example_stacksidebar.cc
+++ b/demos/gtk-demo/example_stacksidebar.cc
@@ -64,14 +64,14 @@ Example_StackSidebar::Example_StackSidebar()
     Gtk::Widget* widget = nullptr;
     if (i == 0)
     {
-      Gtk::Image* image = Gtk::manage(new Gtk::Image());
+      Gtk::Image* image = Gtk::make_managed<Gtk::Image>();
       image->set_from_icon_name("help-about", Gtk::ICON_SIZE_MENU);
       image->set_pixel_size(256);
       widget = image;
     }
     else
     {
-      widget = Gtk::manage(new Gtk::Label(m_page_names[i]));
+      widget = Gtk::make_managed<Gtk::Label>(m_page_names[i]);
     }
     m_Stack.add(*widget, m_page_names[i], m_page_names[i]);
   }
diff --git a/demos/gtk-demo/example_textview.cc b/demos/gtk-demo/example_textview.cc
index ea13b764..078c49aa 100644
--- a/demos/gtk-demo/example_textview.cc
+++ b/demos/gtk-demo/example_textview.cc
@@ -77,7 +77,7 @@ Example_TextView::Example_TextView()
    * a view widget.
    */
   Glib::RefPtr<Gtk::TextBuffer> refBuffer = m_View1.get_buffer();
-  m_pView2 = Gtk::manage( new Gtk::TextView(refBuffer) );
+  m_pView2 = Gtk::make_managed<Gtk::TextView>(refBuffer);
 
   m_ScrolledWindow1.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
   m_VPaned.add1(m_ScrolledWindow1);
@@ -384,13 +384,13 @@ void Example_TextView::attach_widgets(Gtk::TextView& text_view)
     Gtk::Widget* pWidget = nullptr;
     if (i == 0)
     {
-      Gtk::Button* pButton = Gtk::manage( new Gtk::Button("Click Me") );
+      Gtk::Button* pButton = Gtk::make_managed<Gtk::Button>("Click Me");
       pButton->signal_clicked().connect(sigc::mem_fun(*this, &Example_TextView::on_button_clicked));
       pWidget = pButton;
     }
     else if (i == 1)
     {
-      Gtk::ComboBoxText* pCombo = Gtk::manage( new Gtk::ComboBoxText() );
+      Gtk::ComboBoxText* pCombo = Gtk::make_managed<Gtk::ComboBoxText>();
       pCombo->append("Option 1");
       pCombo->append("Option 2");
       pCombo->append("Option 3");
@@ -399,7 +399,7 @@ void Example_TextView::attach_widgets(Gtk::TextView& text_view)
     }
     else if (i == 2)
     {
-      Gtk::Scale* pHScale = Gtk::manage( new Gtk::Scale(Gtk::ORIENTATION_HORIZONTAL) );
+      Gtk::Scale* pHScale = Gtk::make_managed<Gtk::Scale>(Gtk::ORIENTATION_HORIZONTAL);
       pHScale->set_range(0, 100);
       pHScale->set_size_request(70, -1);
 
@@ -407,13 +407,13 @@ void Example_TextView::attach_widgets(Gtk::TextView& text_view)
     }
     else if (i == 3)
       {
-        Gtk::Image* pImage = Gtk::manage( new Gtk::Image() );
+        Gtk::Image* pImage = Gtk::make_managed<Gtk::Image>();
         pImage->set_from_resource("/textview/floppybuddy.gif");
         pWidget = pImage;
       }
     else if (i == 4)
     {
-      pWidget = Gtk::manage( new Gtk::Entry() );
+      pWidget = Gtk::make_managed<Gtk::Entry>();
     }
     else
     {
@@ -447,7 +447,7 @@ Window_EasterEgg::Window_EasterEgg()
   Glib::RefPtr<Gtk::TextChildAnchor> refAnchor = refBuffer->create_child_anchor(iter);
   refBuffer->insert(refBuffer->end(), "\nDon't do this in real applications, please.\n");
 
-  m_pTextView = Gtk::manage( new Gtk::TextView(refBuffer) );
+  m_pTextView = Gtk::make_managed<Gtk::TextView>(refBuffer);
 
   recursive_attach_view(0, *m_pTextView, refAnchor);
 
@@ -465,10 +465,10 @@ void Window_EasterEgg::recursive_attach_view(int depth, Gtk::TextView& view, Gli
   if (depth > 4)
     return;
 
-  Gtk::TextView* pChildView = Gtk::manage( new Gtk::TextView(view.get_buffer()));
+  Gtk::TextView* pChildView = Gtk::make_managed<Gtk::TextView(view.get_buffer>());
 
   /* Frame is to add a black border around each child view */
-  Gtk::Frame* pFrame = Gtk::manage( new Gtk::Frame());
+  Gtk::Frame* pFrame = Gtk::make_managed<Gtk::Frame>();
 
   pFrame->add(*pChildView);
 
diff --git a/demos/gtk-demo/example_treeview_editable_cells.cc 
b/demos/gtk-demo/example_treeview_editable_cells.cc
index 9d7a306b..c80b1714 100644
--- a/demos/gtk-demo/example_treeview_editable_cells.cc
+++ b/demos/gtk-demo/example_treeview_editable_cells.cc
@@ -250,7 +250,7 @@ void Example_TreeView_EditableCells::add_columns()
 
   //And this is the way that works with the IRIX MipsPro compiler too:
   {
-    Gtk::TreeView::Column* pViewColumn = Gtk::manage(new Gtk::TreeView::Column("Number", m_columns.number));
+    Gtk::TreeView::Column* pViewColumn = Gtk::make_managed<Gtk::TreeView::Column>("Number", 
m_columns.number);
 
     //connect signal handlers for auto-storing of edited cell data
     Gtk::CellRenderer* pCellRenderer = pViewColumn->get_first_cell();
@@ -268,7 +268,7 @@ void Example_TreeView_EditableCells::add_columns()
   }
 
   {
-    Gtk::TreeView::Column* pViewColumn = Gtk::manage(new Gtk::TreeView::Column("Product", 
m_columns.product));
+    Gtk::TreeView::Column* pViewColumn = Gtk::make_managed<Gtk::TreeView::Column>("Product", 
m_columns.product);
 
     //connect signal handlers for auto-storing of edited cell data
     Gtk::CellRenderer* pCellRenderer = pViewColumn->get_first_cell();
diff --git a/gtk/gtkmm/object.h b/gtk/gtkmm/object.h
index a9bd4af7..42896900 100644
--- a/gtk/gtkmm/object.h
+++ b/gtk/gtkmm/object.h
@@ -22,6 +22,8 @@
 #include <gtkmm/base.h>
 #include <gtkmmconfig.h>
 
+#include <utility>
+
 namespace Gtk
 {
 
@@ -44,6 +46,25 @@ T* manage(T* obj)
   return obj;
 }
 
+/** Create a Gtk::Object such as a widget and Gtk::manage() it in a single step.
+ * This matches standard functions like std::make_unique<T>(args) and avoids you
+ * manually invoking the new operator, which is discouraged in modern C++ style.
+ *
+ * For instance,
+ * @code
+ * Gtk::Button* button = Gtk::make_managed<Gtk::Button>("Hello");
+ * vbox.pack_start(*button); //vbox will delete button when vbox is deleted.
+ * @endcode
+ *
+ * @param args Arguments to pass to the constructor of the given template type.
+ * @result A new, managed object of that type, constructed with those arguments.
+ */
+template<class T, class... T_Args>
+T* make_managed(T_Args&&... args)
+{
+  return manage(new T(std::forward<T_Args>(args)...));
+}
+
 /** Gtk::Object is the base class for all widgets, and for a few non-widget objects such as
  * Gtk::Adjustment. Gtk::Object predates Glib::Object; non-widgets that derive from Gtk::Object
  * rather than Glib::Object do so for backward compatibility reasons.
diff --git a/tests/child_widget_managed/main.cc b/tests/child_widget_managed/main.cc
index 04895ce3..c6f0ec53 100644
--- a/tests/child_widget_managed/main.cc
+++ b/tests/child_widget_managed/main.cc
@@ -31,7 +31,7 @@ ExampleWindow::ExampleWindow()
 {
     set_default_size(150, 150);
 
-    m_button = manage(new MyButton);
+    m_button = Gtk::make_managed<MyButton>();
     add(*m_button);
 
     show_all_children();
diff --git a/tests/delete_cpp_child/main.cc b/tests/delete_cpp_child/main.cc
index 72ae7fb0..34321800 100644
--- a/tests/delete_cpp_child/main.cc
+++ b/tests/delete_cpp_child/main.cc
@@ -19,15 +19,13 @@ private:
 AppWindow::AppWindow()
     : m_label (nullptr)
 {
-    Gtk::Box* vbox = Gtk::manage(new Gtk::Box (Gtk::ORIENTATION_VERTICAL, 5));
+    Gtk::Box* vbox = Gtk::make_managed<Gtk::Box>(Gtk::ORIENTATION_VERTICAL, 5);
     add(*vbox);
 
-    Gtk::Button* button = Gtk::manage(new Gtk::Button("Delete Label"));
-
+    Gtk::Button* button = Gtk::make_managed<Gtk::Button>("Delete Label");
     vbox->pack_start(*button, Gtk::PACK_SHRINK);
 
-
-    //m_label = manage (new Gtk::Label ("test"));
+    //m_label = Gtk::make_managed<Gtk::Label>("test");
     m_label = new Gtk::Label("test");
     g_warning("m_label -> ref_count: %d\n", G_OBJECT(m_label->gobj())->ref_count);
     vbox->pack_start(*m_label, Gtk::PACK_SHRINK);
diff --git a/tests/dialog/main.cc b/tests/dialog/main.cc
index 9d2e097b..39e7bea5 100644
--- a/tests/dialog/main.cc
+++ b/tests/dialog/main.cc
@@ -19,15 +19,13 @@ private:
 AppWindow::AppWindow()
     : m_label (nullptr)
 {
-    Gtk::Box* vbox = manage (new Gtk::Box (Gtk::ORIENTATION_VERTICAL, 5));
+    Gtk::Box* vbox = Gtk::make_managed<Gtk::Box>(Gtk::ORIENTATION_VERTICAL, 5);
     add(*vbox);
 
-    Gtk::Button* button = Gtk::manage (new Gtk::Button ("Delete Label"));
-
+    Gtk::Button* button = Gtk::make_managed<Gtk::Button>("Delete Label");
     vbox->pack_start(*button, Gtk::PACK_SHRINK);
 
-
-    //m_label = manage (new Gtk::Label ("test"));
+    //m_label = Gtk::make_managed<Gtk::Label>("test");
     m_label = new Gtk::Label ("test");
     g_warning("m_label -> ref_count: %d\n", G_OBJECT(m_label->gobj())->ref_count);
     vbox->pack_start(*m_label, Gtk::PACK_SHRINK);
diff --git a/tests/dialog_deletethis/main.cc b/tests/dialog_deletethis/main.cc
index ad0f39cf..f71f5e2f 100644
--- a/tests/dialog_deletethis/main.cc
+++ b/tests/dialog_deletethis/main.cc
@@ -10,7 +10,7 @@ class Dlg : public sigc::trackable
     Dlg()
     {
       dlg_ = new Gtk::Dialog("Test Dialog");
-      Gtk::Button *btn = manage(new Gtk::Button("ClickMe"));
+      Gtk::Button *btn = Gtk::make_managed<Gtk::Button>("ClickMe");
       btn->signal_clicked().connect(sigc::mem_fun(*this, &Dlg::on_button_clicked));
       dlg_->get_content_area()->pack_start(*btn);
       dlg_->add_button("_OK", Gtk::RESPONSE_OK);
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