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 #include "wx/cpp.h"
  15
  16 // TODO: provide wxCheckedDelete[Array]() template functions too
  17
  18 // ----------------------------------------------------------------------------
  19 // wxCHECKED_DELETE and wxCHECKED_DELETE_ARRAY macros
  20 // ----------------------------------------------------------------------------
  21
  22 /*
  23    checked deleters are used to make sure that the type being deleted is really
  24    a complete type.: otherwise sizeof() would result in a compile-time error
  25
  26    do { ... } while ( 0 ) construct is used to have an anonymous scope
  27    (otherwise we could have name clashes between different "complete"s) but
  28    still force a semicolon after the macro
  29 */
  30
  31 #define wxCHECKED_DELETE(ptr)                                                 \
  32     wxSTATEMENT_MACRO_BEGIN                                                   \
  33         typedef char complete[sizeof(*ptr)] WX_ATTRIBUTE_UNUSED;              \
  34         delete ptr;                                                           \
  35     wxSTATEMENT_MACRO_END
  36
  37 #define wxCHECKED_DELETE_ARRAY(ptr)                                           \
  38     wxSTATEMENT_MACRO_BEGIN                                                   \
  39         typedef char complete[sizeof(*ptr)] WX_ATTRIBUTE_UNUSED;              \
  40         delete [] ptr;                                                        \
  41     wxSTATEMENT_MACRO_END
  42
  43
  44 #endif // _WX_CHECKEDDELETE_H_
  45