include/sal/macros.h

   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 /*
  21  * This file is part of LibreOffice published API.
  22  */
  23
  24 #ifndef INCLUDED_SAL_MACROS_H
  25 #define INCLUDED_SAL_MACROS_H
  26
  27 #include <stddef.h>
  28
  29 #ifndef SAL_N_ELEMENTS
  30 #    if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
  31         /*
  32          * Magic template to calculate at compile time the number of elements
  33          * in an array. Enforcing that the argument must be an array and not
  34          * a pointer, e.g.
  35          *  char *pFoo="foo";
  36          *  SAL_N_ELEMENTS(pFoo);
  37          * fails while
  38          *  SAL_N_ELEMENTS("foo");
  39          * or
  40          *  char aFoo[]="foo";
  41          *  SAL_N_ELEMENTS(aFoo);
  42          * pass
  43          *
  44          * Unfortunately if arr is an array of an anonymous class then we need
  45          * C++0x, i.e. see
  46          * http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#757
  47          */
  48          template <typename T, size_t S> char (&sal_n_array_size( T(&)[S] ))[S];
  49 #        define SAL_N_ELEMENTS(arr)     (sizeof(sal_n_array_size(arr)))
  50 #    else
  51 #        define SAL_N_ELEMENTS(arr)     (sizeof (arr) / sizeof ((arr)[0]))
  52 #    endif
  53 #endif
  54
  55 #ifndef SAL_STRINGIFY
  56 #   define SAL_STRINGIFY_ARG(x) #x
  57 #   define SAL_STRINGIFY(x) SAL_STRINGIFY_ARG(x)
  58 #endif
  59
  60 #endif
  61
  62 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */