sw/source/filter/ww8/staticassert.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   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 WW_STATICASSERT_HXX
  21 #define WW_STATICASSERT_HXX
  22
  23 /*
  24  Lifted direct from:
  25  Modern C++ Design: Generic Programming and Design Patterns Applied
  26  Section 2.1
  27  by Andrei Alexandrescu
  28 */
  29 namespace ww
  30 {
  31     template<bool> class compile_time_check
  32     {
  33     public:
  34         compile_time_check(...) {}
  35     };
  36
  37     template<> class compile_time_check<false>
  38     {
  39     };
  40 }
  41
  42     /*
  43     Similiar to assert, StaticAssert is only in operation when NDEBUG is not
  44     defined. It will test its first argument at compile time and on failure
  45     report the error message of the second argument, which must be a valid c++
  46     classname. i.e. no spaces, punctuation or reserved keywords.
  47     */
  48 #ifndef NDEBUG
  49 #   define StaticAssert(test, errormsg)                         \
  50     do {                                                        \
  51         struct ERROR_##errormsg {};                             \
  52         typedef ww::compile_time_check< (test) != 0 > tmplimpl; \
  53         tmplimpl aTemp = tmplimpl(ERROR_##errormsg());          \
  54         sizeof(aTemp);                                          \
  55     } while (0)
  56 #else
  57 #   define StaticAssert(test, errormsg)                         \
  58     do {} while (0)
  59 #endif
  60
  61 #endif
  62
  63 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */