include/wx/checkeddelete.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/checkeddelete.h
   3 // Purpose:     wxCHECKED_DELETE() macro
   4 // Author:      Vadim Zeitlin
   5 // Created:     2009-02-03
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2002-2009 wxWidgets dev team
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_CHECKEDDELETE_H_
  12 #define _WX_CHECKEDDELETE_H_
  13
  14 // TODO: provide wxCheckedDelete[Array]() template functions too
  15
  16 // ----------------------------------------------------------------------------
  17 // wxCHECKED_DELETE and wxCHECKED_DELETE_ARRAY macros
  18 // ----------------------------------------------------------------------------
  19
  20 /*
  21    checked deleters are used to make sure that the type being deleted is really
  22    a complete type.: otherwise sizeof() would result in a compile-time error
  23
  24    do { ... } while ( 0 ) construct is used to have an anonymous scope
  25    (otherwise we could have name clashes between different "complete"s) but
  26    still force a semicolon after the macro
  27 */
  28
  29 #ifdef __WATCOMC__
  30     #define wxFOR_ONCE(name)              for(int name=0; name<1; name++)
  31     #define wxPRE_NO_WARNING_SCOPE(name)  wxFOR_ONCE(wxMAKE_UNIQUE_NAME(name))
  32     #define wxPOST_NO_WARNING_SCOPE(name)
  33 #else
  34     #define wxPRE_NO_WARNING_SCOPE(name)  do
  35     #define wxPOST_NO_WARNING_SCOPE(name) while ( wxFalse )
  36 #endif
  37
  38 #define wxCHECKED_DELETE(ptr)                                                 \
  39     wxPRE_NO_WARNING_SCOPE(scope_var1)                                        \
  40     {                                                                         \
  41         typedef char complete[sizeof(*ptr)];                                  \
  42         delete ptr;                                                           \
  43     } wxPOST_NO_WARNING_SCOPE(scope_var1)
  44
  45 #define wxCHECKED_DELETE_ARRAY(ptr)                                           \
  46     wxPRE_NO_WARNING_SCOPE(scope_var2)                                        \
  47     {                                                                         \
  48         typedef char complete[sizeof(*ptr)];                                  \
  49         delete [] ptr;                                                        \
  50     } wxPOST_NO_WARNING_SCOPE(scope_var2)
  51
  52
  53 #endif // _WX_CHECKEDDELETE_H_
  54