src/xalanc/Include/XalanAutoPtr.hpp

/*
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#if !defined(XALANAUTOPTR_HEADER_GUARD_1357924680)
#define XALANAUTOPTR_HEADER_GUARD_1357924680



// Base include file.  Must be first.
#include <xalanc/PlatformSupport/PlatformSupportDefinitions.hpp>



#include <cstddef>



XALAN_CPP_NAMESPACE_BEGIN



// We're using our own auto_ptr-like class due to wide
// variations amongst the varous platforms we have to
// support
template<class Type>
class XalanAutoPtr
{
public:

    XalanAutoPtr(Type*  thePointer = 0) :
        m_pointer(thePointer)
    {
    }

    XalanAutoPtr(const XalanAutoPtr<Type>&  theSource) :
        m_pointer(const_cast<XalanAutoPtr<Type>&>(theSource).release())
    {
    }

    XalanAutoPtr<Type>&
    operator=(XalanAutoPtr<Type>&   theRHS)
    {
        if (this != &theRHS)
        {
            // This test ought not to be necessary, but
            // MSVC 6.0 calls delete, which checks for 0.
            // The problem with that is the locking is
            // extremely expensive.
            if (m_pointer != 0)
            {
                delete m_pointer;
            }

            m_pointer = theRHS.release();
        }

        return *this;
    }

    ~XalanAutoPtr()
    {
        // See note in operator=() about this...
        if (m_pointer != 0)
        {
            delete m_pointer;
        }
    }

    Type&
    operator*() const
    {
        return *m_pointer;
    }

    Type*
    operator->() const
    {
        return m_pointer;
    }

    Type*
    get() const
    {
        return m_pointer;
    }

    Type*
    release()
    {
        Type* const temp = m_pointer;

        m_pointer = 0;

        return temp;
    }

    void
    reset(Type*     thePointer = 0)
    {
        // See note in operator=() about this...
        if (m_pointer != 0)
        {
            delete m_pointer;
        }

        m_pointer = thePointer;
    }

private:

    Type*   m_pointer;
};



// A class similar to XalanAutoPtr, but for arrays.
template<class Type>
class XalanArrayAutoPtr
{
public:

    XalanArrayAutoPtr(Type*     thePointer = 0) :
        m_pointer(thePointer)
    {
    }

    XalanArrayAutoPtr(const XalanArrayAutoPtr<Type>&    theSource) :
        m_pointer(((XalanArrayAutoPtr<Type>&)theSource).release())
    {
    }

    XalanArrayAutoPtr<Type>&
    operator=(XalanArrayAutoPtr<Type>&  theRHS)
    {
        if (this != &theRHS)
        {
            // This test ought not to be necessary, but
            // MSVC 6.0 calls delete, which checks for 0.
            // The problem with that is the locking is
            // extremely expensive.
            if (m_pointer != 0)
            {
                delete [] m_pointer;
            }

            m_pointer = theRHS.release();
        }

        return *this;
    }

    ~XalanArrayAutoPtr()
    {
        // See note in operator=() about this...
        if (m_pointer != 0)
        {
            delete [] m_pointer;
        }
    }

    Type&
    operator*() const
    {
        return *m_pointer;
    }

    Type&
#if defined(XALAN_STRICT_ANSI_HEADERS)
    operator[](std::size_t  index) const
#else
    operator[](size_t   index) const
#endif
    {
        return m_pointer[index];
    }

    Type*
    get() const
    {
        return m_pointer;
    }

    Type*
    release()
    {
        Type* const temp = m_pointer;

        m_pointer = 0;

        return temp;
    }

    void
    reset(Type*     thePointer = 0)
    {
        // See note in operator=() about this...
        if (m_pointer != 0)
        {
            delete [] m_pointer;
        }

        m_pointer = thePointer;
    }

private:

    Type*   m_pointer;
};



XALAN_CPP_NAMESPACE_END



#endif  // if !defined(XALANAUTOPTR_HEADER_GUARD_1357924680)