/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef WW_STATICASSERT_HXX
#define WW_STATICASSERT_HXX

/*
 Lifted direct from:
 Modern C++ Design: Generic Programming and Design Patterns Applied
 Section 2.1
 by Andrei Alexandrescu
*/
namespace ww
{
    template<bool> class compile_time_check
    {
    public:
        compile_time_check(...) {}
    };

    template<> class compile_time_check<false>
    {
    };
}

    /*
    Similiar to assert, StaticAssert is only in operation when NDEBUG is not
    defined. It will test its first argument at compile time and on failure
    report the error message of the second argument, which must be a valid c++
    classname. i.e. no spaces, punctuation or reserved keywords.
    */
#ifndef NDEBUG
#   define StaticAssert(test, errormsg)                         \
    do {                                                        \
        struct ERROR_##errormsg {};                             \
        typedef ww::compile_time_check< (test) != 0 > tmplimpl; \
        tmplimpl aTemp = tmplimpl(ERROR_##errormsg());          \
        sizeof(aTemp);                                          \
    } while (0)
#else
#   define StaticAssert(test, errormsg)                         \
    do {} while (0)
#endif

#endif

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