sw/source/filter/ww8/staticassert.hxx

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  31 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil -*- */
  32 #ifndef WW_STATICASSERT_HXX
  33 #define WW_STATICASSERT_HXX
  34
  35 /*
  36  Lifted direct from:
  37  Modern C++ Design: Generic Programming and Design Patterns Applied
  38  Section 2.1
  39  by Andrei Alexandrescu
  40 */
  41 namespace ww
  42 {
  43     template<bool> class compile_time_check
  44     {
  45     public:
  46         compile_time_check(...) {}
  47     };
  48
  49     template<> class compile_time_check<false>
  50     {
  51     };
  52 }
  53
  54     /*
  55     Similiar to assert, StaticAssert is only in operation when NDEBUG is not
  56     defined. It will test its first argument at compile time and on failure
  57     report the error message of the second argument, which must be a valid c++
  58     classname. i.e. no spaces, punctuation or reserved keywords.
  59     */
  60 #ifndef NDEBUG
  61 #   define StaticAssert(test, errormsg)                         \
  62     do {                                                        \
  63         struct ERROR_##errormsg {};                             \
  64         typedef ww::compile_time_check< (test) != 0 > tmplimpl; \
  65         tmplimpl aTemp = tmplimpl(ERROR_##errormsg());          \
  66         sizeof(aTemp);                                          \
  67     } while (0)
  68 #else
  69 #   define StaticAssert(test, errormsg)                         \
  70     do {} while (0)
  71 #endif
  72
  73 #endif
  74 /* vi:set tabstop=4 shiftwidth=4 expandtab: */