UDK 3.2.7 C/C++ API Reference
sal/macros.h
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00028 
00029 #ifndef _SAL_MACROS_H_
00030 #define _SAL_MACROS_H_
00031 
00032 #include <stddef.h>
00033 
00034 #ifndef SAL_MAX
00035 #    define SAL_MAX(a,b)            (((a) > (b)) ? (a) : (b))
00036 #endif
00037 
00038 #ifndef SAL_MIN
00039 #    define SAL_MIN(a,b)            (((a) < (b)) ? (a) : (b))
00040 #endif
00041 
00042 #ifndef SAL_FIELDOFFSET
00043 #    define SAL_FIELDOFFSET(type, field) ((sal_Int32)(&((type *)16)->field) - 16)
00044 #endif
00045 
00046 #ifndef SAL_N_ELEMENTS
00047 #    if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
00048         /*
00049          * Magic template to calculate at compile time the number of elements
00050          * in an array. Enforcing that the argument must be a array and not
00051          * a pointer, e.g.
00052          *  char *pFoo="foo";
00053          *  SAL_N_ELEMENTS(pFoo);
00054          * fails while
00055          *  SAL_N_ELEMENTS("foo");
00056          * or
00057          *  char aFoo[]="foo";
00058          *  SAL_N_ELEMENTS(aFoo);
00059          * pass
00060          *
00061          * Unfortunately if arr is an array of an anonymous class then we need
00062          * C++0x, i.e. see
00063          * http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#757
00064          */
00065          template <typename T, size_t S> char (&sal_n_array_size( T(&)[S] ))[S];
00066 #        define SAL_N_ELEMENTS(arr)     (sizeof(sal_n_array_size(arr)))
00067 #    else
00068 #        define SAL_N_ELEMENTS(arr)     (sizeof (arr) / sizeof ((arr)[0]))
00069 #    endif
00070 #endif
00071 
00072 #ifndef SAL_BOUND
00073 #    define SAL_BOUND(x,l,h)        ((x) <= (l) ? (l) : ((x) >= (h) ? (h) : (x)))
00074 #endif
00075 
00076 #ifndef SAL_ABS
00077 #    define SAL_ABS(a)              (((a) < 0) ? (-(a)) : (a))
00078 #endif
00079 
00080 #ifndef SAL_STRINGIFY
00081 #   define SAL_STRINGIFY_ARG(x) #x
00082 #   define SAL_STRINGIFY(x) SAL_STRINGIFY_ARG(x)
00083 #endif
00084 
00085 #endif
00086 
00087 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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