renamed wx/ptr_shrd.h to wx/sharedptr.h; split wx/ptr_scpd.h in wx/scopedptr.h and wx/scopedarray.h; extracted common parts into new wx/checkeddelete.h

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58634 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/checkeddelete.h

@@ -0,0 +1,54 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/checkeddelete.h
+// Purpose:     wxCHECKED_DELETE() macro
+// Author:      Vadim Zeitlin
+// Created:     2009-02-03
+// RCS-ID:      $Id$
+// Copyright:   (c) 2002-2009 wxWidgets dev team
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_CHECKEDDELETE_H_
+#define _WX_CHECKEDDELETE_H_
+
+// TODO: provide wxCheckedDelete[Array]() template functions too
+
+// ----------------------------------------------------------------------------
+// wxCHECKED_DELETE and wxCHECKED_DELETE_ARRAY macros
+// ----------------------------------------------------------------------------
+
+/*
+   checked deleters are used to make sure that the type being deleted is really
+   a complete type.: otherwise sizeof() would result in a compile-time error
+
+   do { ... } while ( 0 ) construct is used to have an anonymous scope
+   (otherwise we could have name clashes between different "complete"s) but
+   still force a semicolon after the macro
+*/
+
+#ifdef __WATCOMC__
+    #define wxFOR_ONCE(name)              for(int name=0; name<1; name++)
+    #define wxPRE_NO_WARNING_SCOPE(name)  wxFOR_ONCE(wxMAKE_UNIQUE_NAME(name))
+    #define wxPOST_NO_WARNING_SCOPE(name)
+#else
+    #define wxPRE_NO_WARNING_SCOPE(name)  do
+    #define wxPOST_NO_WARNING_SCOPE(name) while ( wxFalse )
+#endif
+
+#define wxCHECKED_DELETE(ptr)                                                 \
+    wxPRE_NO_WARNING_SCOPE(scope_var1)                                        \
+    {                                                                         \
+        typedef char complete[sizeof(*ptr)];                                  \
+        delete ptr;                                                           \
+    } wxPOST_NO_WARNING_SCOPE(scope_var1)
+
+#define wxCHECKED_DELETE_ARRAY(ptr)                                           \
+    wxPRE_NO_WARNING_SCOPE(scope_var2)                                        \
+    {                                                                         \
+        typedef char complete[sizeof(*ptr)];                                  \
+        delete [] ptr;                                                        \
+    } wxPOST_NO_WARNING_SCOPE(scope_var2)
+
+
+#endif // _WX_CHECKEDDELETE_H_
+