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macros.h
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /*
3 * This file is part of the LibreOffice project.
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 * This file incorporates work covered by the following license notice:
10 *
11 * Licensed to the Apache Software Foundation (ASF) under one or more
12 * contributor license agreements. See the NOTICE file distributed
13 * with this work for additional information regarding copyright
14 * ownership. The ASF licenses this file to you under the Apache
15 * License, Version 2.0 (the "License"); you may not use this file
16 * except in compliance with the License. You may obtain a copy of
17 * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 */
19
20 #ifndef _SAL_MACROS_H_
21 #define _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: */