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 // Copyright:   (c) 2002-2009 wxWidgets dev team
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef _WX_CHECKEDDELETE_H_
  11 #define _WX_CHECKEDDELETE_H_
  12
  13 #include "wx/cpp.h"
  14
  15 // TODO: provide wxCheckedDelete[Array]() template functions too
  16
  17 // ----------------------------------------------------------------------------
  18 // wxCHECKED_DELETE and wxCHECKED_DELETE_ARRAY macros
  19 // ----------------------------------------------------------------------------
  20
  21 /*
  22    checked deleters are used to make sure that the type being deleted is really
  23    a complete type.: otherwise sizeof() would result in a compile-time error
  24
  25    do { ... } while ( 0 ) construct is used to have an anonymous scope
  26    (otherwise we could have name clashes between different "complete"s) but
  27    still force a semicolon after the macro
  28 */
  29
  30 #define wxCHECKED_DELETE(ptr)                                                 \
  31     wxSTATEMENT_MACRO_BEGIN                                                   \
  32         typedef char complete[sizeof(*ptr)] WX_ATTRIBUTE_UNUSED;              \
  33         delete ptr;                                                           \
  34     wxSTATEMENT_MACRO_END
  35
  36 #define wxCHECKED_DELETE_ARRAY(ptr)                                           \
  37     wxSTATEMENT_MACRO_BEGIN                                                   \
  38         typedef char complete[sizeof(*ptr)] WX_ATTRIBUTE_UNUSED;              \
  39         delete [] ptr;                                                        \
  40     wxSTATEMENT_MACRO_END
  41
  42
  43 #endif // _WX_CHECKEDDELETE_H_
  44