[gtkmm/wip/dboles/Builder-test-cleanups: 2/3] tests/builder: Default-init members at declaration

[Daniel Boles <dboles src gnome org>]

commit 87acd6b475d18e6794b5e544c85365e6c0cc99e9
Author: Daniel Boles <dboles src gmail com>
Date:   Sun Nov 24 14:02:30 2019 +0000

    tests/builder: Default-init members at declaration
    
    as that is safer than having to remember to default-construct pointers
    in every constructor overload—& getting undefined behaviour if we don’t.

 tests/builder/main.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/tests/builder/main.cc b/tests/builder/main.cc
index 093c2edc..df59dbba 100644
--- a/tests/builder/main.cc
+++ b/tests/builder/main.cc
@@ -107,7 +107,7 @@ class MainWindow : public Gtk::Window
 {
 public:
   MainWindow(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& refBuilder)
-  : Gtk::Window(cobject), m_pDerivedButton(nullptr), m_pStandardButton(nullptr)
+  : Gtk::Window(cobject)
   {
     std::cout << "MainWindow::ctor" << std::endl;
 
@@ -129,8 +129,8 @@ public:
   const Gtk::Button* get_standard_button() const { return m_pStandardButton; }
 
 private:
-  DerivedButton* m_pDerivedButton;
-  Gtk::Button* m_pStandardButton;
+  DerivedButton* m_pDerivedButton = nullptr;
+  Gtk::Button* m_pStandardButton = nullptr;
 };
 
 } // end of anonymous namespace