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macros.h
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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9  * This file incorporates work covered by the following license notice:
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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_BOUND
52 # define SAL_BOUND(x,l,h) ((x) <= (l) ? (l) : ((x) >= (h) ? (h) : (x)))
53 #endif
54 
55 #ifndef SAL_ABS
56 # define SAL_ABS(a) (((a) < 0) ? (-(a)) : (a))
57 #endif
58 
59 #ifndef SAL_STRINGIFY
60 # define SAL_STRINGIFY_ARG(x) #x
61 # define SAL_STRINGIFY(x) SAL_STRINGIFY_ARG(x)
62 #endif
63 
64 #endif
65 
66 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */