    /* -*- 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 INCLUDED_MYSQLC_SOURCE_MYSQLC_SUBCOMPONENT_HXX
    #define INCLUDED_MYSQLC_SOURCE_MYSQLC_SUBCOMPONENT_HXX

    #include <com/sun/star/lang/DisposedException.hpp>
    #include <cppuhelper/interfacecontainer.h>
    #include <cppuhelper/propshlp.hxx>
    #include <cppuhelper/supportsservice.hxx>
    #include <cppuhelper/weak.hxx>
    #include <osl/diagnose.h>
    #include <osl/mutex.hxx>

    namespace cppu
    {
    class IPropertyArrayHelper;
    }

    namespace com
    {
    namespace sun
    {
    namespace star
    {
    namespace lang
    {
    class XComponent;
    }
    }
    }
    }

    namespace connectivity
    {
    namespace mysqlc
    {
    /// @throws css::lang::DisposedException
    void checkDisposed(bool _bThrow);

    template <class TYPE> class OPropertyArrayUsageHelper
    {
    protected:
        static sal_Int32 s_nRefCount;
        static ::cppu::IPropertyArrayHelper* s_pProps;
        static ::osl::Mutex s_aMutex;

    public:
        OPropertyArrayUsageHelper();
        virtual ~OPropertyArrayUsageHelper();

        /** call this in the getInfoHelper method of your derived class. The method returns the array helper of the
                    class, which is created if necessary.
                */
        ::cppu::IPropertyArrayHelper* getArrayHelper();

    protected:
        /** used to implement the creation of the array helper which is shared amongst all instances of the class.
                    This method needs to be implemented in derived classes.
                    <BR>
                    The method gets called with s_aMutex acquired.
                    @return                         an pointer to the newly created array helper. Must not be NULL.
                */
        virtual ::cppu::IPropertyArrayHelper* createArrayHelper() const = 0;
    };

    template <class TYPE> sal_Int32 OPropertyArrayUsageHelper<TYPE>::s_nRefCount = 0;

    template <class TYPE>
    ::cppu::IPropertyArrayHelper* OPropertyArrayUsageHelper<TYPE>::s_pProps = nullptr;

    template <class TYPE>::osl::Mutex OPropertyArrayUsageHelper<TYPE>::s_aMutex;

    template <class TYPE> OPropertyArrayUsageHelper<TYPE>::OPropertyArrayUsageHelper()
    {
        ::osl::MutexGuard aGuard(s_aMutex);
        ++s_nRefCount;
    }

    template <class TYPE> OPropertyArrayUsageHelper<TYPE>::~OPropertyArrayUsageHelper()
    {
        ::osl::MutexGuard aGuard(s_aMutex);
        OSL_ENSURE(s_nRefCount > 0, "OPropertyArrayUsageHelper::~OPropertyArrayUsageHelper : "
                                    "suspicious call : have a refcount of 0 !");
        if (!--s_nRefCount)
        {
            delete s_pProps;
            s_pProps = nullptr;
        }
    }

    template <class TYPE>::cppu::IPropertyArrayHelper* OPropertyArrayUsageHelper<TYPE>::getArrayHelper()
    {
        OSL_ENSURE(
            s_nRefCount,
            "OPropertyArrayUsageHelper::getArrayHelper : suspicious call : have a refcount of 0 !");
        if (!s_pProps)
        {
            ::osl::MutexGuard aGuard(s_aMutex);
            if (!s_pProps)
            {
                s_pProps = createArrayHelper();
                OSL_ENSURE(s_pProps, "OPropertyArrayUsageHelper::getArrayHelper : createArrayHelper "
                                     "returned nonsense !");
            }
        }
        return s_pProps;
    }

    class OBase_Mutex
    {
    public:
        ::osl::Mutex m_aMutex;
    };

    namespace internal
    {
    template <class T> void implCopySequence(const T* _pSource, T*& _pDest, sal_Int32 _nSourceLen)
    {
        for (sal_Int32 i = 0; i < _nSourceLen; ++i, ++_pSource, ++_pDest)
            *_pDest = *_pSource;
    }
    }

    /// concat two sequences
    template <class T>
    css::uno::Sequence<T> concatSequences(const css::uno::Sequence<T>& _rLeft,
                                          const css::uno::Sequence<T>& _rRight)
    {
        sal_Int32 nLeft(_rLeft.getLength()), nRight(_rRight.getLength());
        const T* pLeft = _rLeft.getConstArray();
        const T* pRight = _rRight.getConstArray();

        sal_Int32 nReturnLen(nLeft + nRight);
        css::uno::Sequence<T> aReturn(nReturnLen);
        T* pReturn = aReturn.getArray();

        internal::implCopySequence(pLeft, pReturn, nLeft);
        internal::implCopySequence(pRight, pReturn, nRight);

        return aReturn;
    }
    }
    }

    #endif // INCLUDED_MYSQLC_SOURCE_MYSQLC_SUBCOMPONENT_HXX

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V547 Expression '!s_pProps' is always true.