include/sal/macros.h

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  19
  20 #ifndef INCLUDED_SAL_MACROS_H
  21 #define INCLUDED_SAL_MACROS_H
  22
  23 #include <stddef.h>
  24
  25 #ifndef SAL_N_ELEMENTS
  26 #    if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
  27         /*
  28          * Magic template to calculate at compile time the number of elements
  29          * in an array. Enforcing that the argument must be a array and not
  30          * a pointer, e.g.
  31          *  char *pFoo="foo";
  32          *  SAL_N_ELEMENTS(pFoo);
  33          * fails while
  34          *  SAL_N_ELEMENTS("foo");
  35          * or
  36          *  char aFoo[]="foo";
  37          *  SAL_N_ELEMENTS(aFoo);
  38          * pass
  39          *
  40          * Unfortunately if arr is an array of an anonymous class then we need
  41          * C++0x, i.e. see
  42          * http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#757
  43          */
  44          template <typename T, size_t S> char (&sal_n_array_size( T(&)[S] ))[S];
  45 #        define SAL_N_ELEMENTS(arr)     (sizeof(sal_n_array_size(arr)))
  46 #    else
  47 #        define SAL_N_ELEMENTS(arr)     (sizeof (arr) / sizeof ((arr)[0]))
  48 #    endif
  49 #endif
  50
  51 #ifndef SAL_STRINGIFY
  52 #   define SAL_STRINGIFY_ARG(x) #x
  53 #   define SAL_STRINGIFY(x) SAL_STRINGIFY_ARG(x)
  54 #endif
  55
  56 #endif
  57
  58 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */