Use C++11 nullptr rather than 0 in code (bug #51565). * Backend.cc, BaseControl.h, ButtonGroup.cc, CheckBoxControl.cc, Container.cc, ContextMenu.cc, ContextMenu.h, EditControl.cc, Figure.cc, FigureWindow.cc, ListBoxControl.cc, Menu.cc, Menu.h, MouseModeActionGroup.cc, Object.cc, ObjectProxy.cc, Panel.cc, PopupMenuControl.cc, PushButtonControl.cc, PushTool.cc, RadioButtonControl.cc, SliderControl.cc, TextControl.cc, ToggleButtonControl.cc, ToggleTool.cc, ToolBar.cc, ToolBar.h, ToolBarButton.cc, ToolBarButton.h, QTerminal.h, BlockArray.cpp, Emulation.cpp, Filter.cpp, Filter.h, History.cpp, KeyboardTranslator.cpp, QUnixTerminalImpl.h, Screen.cpp, ScreenWindow.cpp, ScreenWindow.h, SelfListener.h, TerminalCharacterDecoder.cpp, TerminalModel.cpp, TerminalView.cpp, TerminalView.h, kpty.cpp, dialog.cc, dialog.h, files-dock-widget.cc, find-files-model.h, file-editor-tab.cc, file-editor.cc, main-window.cc, octave-dock-widget.cc, octave-gui.cc, parser.cc, resource-manager.cc, resource-manager.h, shortcut-manager.cc, shortcut-manager.h, workspace-model.cc, workspace-view.cc, __magick_read__.cc, c-file-ptr-stream.cc, c-file-ptr-stream.h, call-stack.cc, call-stack.h, daspk.cc, dasrt.cc, dassl.cc, det.cc, display.h, error.cc, ft-text-renderer.cc, gl-render.cc, gl2ps-print.cc, graphics.in.h, help.cc, input.cc, interpreter.cc, load-path.cc, load-save.cc, ls-hdf5.cc, ls-hdf5.h, ls-mat5.cc, lsode.cc, mex.cc, mxarray.in.h, oct-errno.h, oct-hist.cc, oct-iostrm.h, oct-procbuf.cc, oct-procbuf.h, oct-stdstrm.h, oct-stream.cc, oct-stream.h, oct-strstrm.h, oct-tex-parser.in.yy, octave-link.h, pager.cc, pager.h, pr-output.cc, procstream.h, qz.cc, sighandlers.cc, svd.cc, symtab.cc, symtab.h, text-renderer.cc, txt-eng.h, utils.cc, variables.cc, zfstream.cc, zfstream.h, __glpk__.cc, __init_fltk__.cc, __ode15__.cc, audiodevinfo.cc, ccolamd.cc, colamd.cc, dmperm.cc, gzip.cc, symbfact.cc, ov-base-int.cc, ov-base-int.h, ov-base-mat.h, ov-base.cc, ov-base.h, ov-bool-mat.cc, ov-bool-sparse.cc, ov-bool.cc, ov-builtin.h, ov-cell.cc, ov-class.cc, ov-complex.cc, ov-cx-mat.cc, ov-cx-sparse.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-fcn.cc, ov-fcn.h, ov-float.cc, ov-flt-complex.cc, ov-flt-cx-mat.cc, ov-flt-re-mat.cc, ov-java.cc, ov-java.h, ov-mex-fcn.cc, ov-oncleanup.cc, ov-range.cc, ov-range.h, ov-re-mat.cc, ov-re-sparse.cc, ov-scalar.cc, ov-str-mat.cc, ov-typeinfo.cc, ov-typeinfo.h, ov-usr-fcn.cc, ov-usr-fcn.h, ov.cc, octave.cc, bp-table.cc, bp-table.h, jit-ir.h, jit-typeinfo.cc, lex.h, profiler.cc, pt-arg-list.cc, pt-array-list.cc, pt-assign.cc, pt-assign.h, pt-binop.cc, pt-binop.h, pt-cell.cc, pt-classdef.cc, pt-classdef.h, pt-colon.cc, pt-colon.h, pt-decl.cc, pt-decl.h, pt-eval.cc, pt-eval.h, pt-except.h, pt-fcn-handle.cc, pt-fcn-handle.h, pt-idx.cc, pt-jit.cc, pt-loop.h, pt-mat.cc, pt-select.h, pt-stmt.h, pt-tm-const.h, pt-unop.cc, pt-unop.h, pt.cc, Array-C.cc, Array-d.cc, Array-f.cc, Array-fC.cc, Array-util.cc, Array.cc, Array.h, CMatrix.cc, CSparse.cc, DiagArray2.h, MArray.h, MDiagArray2.h, MatrixType.cc, Sparse.cc, Sparse.h, dMatrix.cc, dSparse.cc, fMatrix.cc, idx-vector.cc, idx-vector.h, DAEFunc.h, DAERTFunc.h, ODEFunc.h, ODESFunc.h, eigs-base.cc, oct-fftw.cc, oct-fftw.h, oct-rand.h, oct-spparms.h, schur.cc, sparse-chol.cc, sparse-dmsolve.cc, sparse-lu.cc, sparse-qr.cc, child-list.h, dir-ops.cc, dir-ops.h, file-ops.cc, lo-sysdep.cc, oct-env.h, oct-time.cc, cmd-edit.cc, cmd-edit.h, cmd-hist.h, lo-regexp.cc, lo-regexp.h, lo-utils.cc, oct-shlib.cc, oct-shlib.h, oct-sort.cc, oct-sort.h, quit.cc, singleton-cleanup.h, str-vec.cc: Use C++11 nullptr rather than 0 in code (bug #51565).

--- a/libinterp/corefcn/ft-text-renderer.cc	Mon Jul 24 16:48:03 2017 +0200
+++ b/libinterp/corefcn/ft-text-renderer.cc	Tue Jul 25 14:54:10 2017 -0700
@@ -156,14 +156,14 @@
       return retval;
     }
 
-    static void cleanup_instance (void) { delete instance; instance = 0; }
+    static void cleanup_instance (void) { delete instance; instance = nullptr; }
 
     static FT_Face get_font (const std::string& name, const std::string& weight,
                              const std::string& angle, double size)
     {
       return (instance_ok ()
               ? instance->do_get_font (name, weight, angle, size)
-              : 0);
+              : nullptr);
     }
 
     static void font_destroyed (FT_Face face)
@@ -187,7 +187,7 @@
     FT_Face do_get_font (const std::string& name, const std::string& weight,
                          const std::string& angle, double size)
     {
-      FT_Face retval = 0;
+      FT_Face retval = nullptr;
 
 #if defined (HAVE_FT_REFERENCE_FACE)
       // Look first into the font cache, then use fontconfig.  If the font
@@ -236,13 +236,13 @@
           FcPatternAddInteger (pat, FC_SLANT, fc_angle);
           FcPatternAddDouble (pat, FC_PIXEL_SIZE, size);
 
-          if (FcConfigSubstitute (0, pat, FcMatchPattern))
+          if (FcConfigSubstitute (nullptr, pat, FcMatchPattern))
             {
               FcResult res;
               FcPattern *match;
 
               FcDefaultSubstitute (pat);
-              match = FcFontMatch (0, pat, &res);
+              match = FcFontMatch (nullptr, pat, &res);
 
               // FIXME: originally, this test also required that
               // res != FcResultNoMatch.  Is that really needed?
@@ -307,7 +307,7 @@
 
           cache.erase (*pkey);
           delete pkey;
-          face->generic.data = 0;
+          face->generic.data = nullptr;
         }
     }
 
@@ -423,10 +423,10 @@
     public:
 
       ft_font (void)
-        : text_renderer::font (), face (0) { }
+        : text_renderer::font (), face (nullptr) { }
 
       ft_font (const std::string& nm, const std::string& wt,
-               const std::string& ang, double sz, FT_Face f = 0)
+               const std::string& ang, double sz, FT_Face f = nullptr)
         : text_renderer::font (nm, wt, ang, sz), face (f)
       { }
 
@@ -520,7 +520,7 @@
   {
     // FIXME: take "fontunits" into account
 
-    font = ft_font (name, weight, angle, size, 0);
+    font = ft_font (name, weight, angle, size, nullptr);
   }
 
   void
@@ -904,7 +904,7 @@
                 if (r != 0)
                   ::warning ("ft_text_renderer: failed to decode string `%s' with "
                              "locale `%s'", str.c_str (),
-                             std::setlocale (LC_CTYPE, 0));
+                             std::setlocale (LC_CTYPE, nullptr));
                 break;
               }
           }
@@ -1321,7 +1321,7 @@
   }
 
   ft_text_renderer::ft_font::ft_font (const ft_font& ft)
-    : text_renderer::font (ft), face (0)
+    : text_renderer::font (ft), face (nullptr)
   {
 #if defined (HAVE_FT_REFERENCE_FACE)
     FT_Face ft_face = ft.get_face ();
@@ -1341,7 +1341,7 @@
         if (face)
           {
             FT_Done_Face (face);
-            face = 0;
+            face = nullptr;
           }
 
 #if defined (HAVE_FT_REFERENCE_FACE)