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XalanAutoPtr.hpp

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00001 /*
00002  * The Apache Software License, Version 1.1
00003  *
00004  *
00005  * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights 
00006  * reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions
00010  * are met:
00011  *
00012  * 1. Redistributions of source code must retain the above copyright
00013  *    notice, this list of conditions and the following disclaimer. 
00014  *
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in
00017  *    the documentation and/or other materials provided with the
00018  *    distribution.
00019  *
00020  * 3. The end-user documentation included with the redistribution,
00021  *    if any, must include the following acknowledgment:  
00022  *       "This product includes software developed by the
00023  *        Apache Software Foundation (http://www.apache.org/)."
00024  *    Alternately, this acknowledgment may appear in the software itself,
00025  *    if and wherever such third-party acknowledgments normally appear.
00026  *
00027  * 4. The names "Xalan" and "Apache Software Foundation" must
00028  *    not be used to endorse or promote products derived from this
00029  *    software without prior written permission. For written 
00030  *    permission, please contact apache@apache.org.
00031  *
00032  * 5. Products derived from this software may not be called "Apache",
00033  *    nor may "Apache" appear in their name, without prior written
00034  *    permission of the Apache Software Foundation.
00035  *
00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00038  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
00040  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00041  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
00043  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00044  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00045  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00047  * SUCH DAMAGE.
00048  * ====================================================================
00049  *
00050  * This software consists of voluntary contributions made by many
00051  * individuals on behalf of the Apache Software Foundation and was
00052  * originally based on software copyright (c) 1999, International
00053  * Business Machines, Inc., http://www.ibm.com.  For more
00054  * information on the Apache Software Foundation, please see
00055  * <http://www.apache.org/>.
00056  */
00057 #if !defined(XALANAUTOPTR_HEADER_GUARD_1357924680)
00058 #define XALANAUTOPTR_HEADER_GUARD_1357924680
00059 
00060 
00061 
00062 // Base include file.  Must be first.
00063 #include <xalanc/PlatformSupport/PlatformSupportDefinitions.hpp>
00064 
00065 
00066 
00067 #include <cstddef>
00068 
00069 
00070 
00071 XALAN_CPP_NAMESPACE_BEGIN
00072 
00073 
00074 
00075 // We're using our own auto_ptr-like class due to wide
00076 // variations amongst the varous platforms we have to
00077 // support
00078 template<class Type>
00079 class XalanAutoPtr
00080 {
00081 public:
00082 
00083     XalanAutoPtr(Type*  thePointer = 0) :
00084         m_pointer(thePointer)
00085     {
00086     }
00087 
00088     XalanAutoPtr(const XalanAutoPtr<Type>&  theSource) :
00089         m_pointer(((XalanAutoPtr<Type>&)theSource).release())
00090     {
00091     }
00092 
00093     XalanAutoPtr<Type>&
00094     operator=(XalanAutoPtr<Type>&   theRHS)
00095     {
00096         if (this != &theRHS)
00097         {
00098             // This test ought not to be necessary, but
00099             // MSVC 6.0 calls delete, which checks for 0.
00100             // The problem with that is the locking is
00101             // extremely expensive.
00102             if (m_pointer != 0)
00103             {
00104                 delete m_pointer;
00105             }
00106 
00107             m_pointer = theRHS.release();
00108         }
00109 
00110         return *this;
00111     }
00112 
00113     ~XalanAutoPtr()
00114     {
00115         // See note in operator=() about this...
00116         if (m_pointer != 0)
00117         {
00118             delete m_pointer;
00119         }
00120     }
00121 
00122     Type&
00123     operator*() const
00124     {
00125         return *m_pointer;
00126     }
00127 
00128     Type*
00129     operator->() const
00130     {
00131         return m_pointer;
00132     }
00133 
00134     Type*
00135     get() const
00136     {
00137         return m_pointer;
00138     }
00139 
00140     Type*
00141     release()
00142     {
00143         Type* const temp = m_pointer;
00144 
00145         m_pointer = 0;
00146 
00147         return temp;
00148     }
00149 
00150     void
00151     reset(Type*     thePointer = 0)
00152     {
00153         // See note in operator=() about this...
00154         if (m_pointer != 0)
00155         {
00156             delete m_pointer;
00157         }
00158 
00159         m_pointer = thePointer;
00160     }
00161 
00162 private:
00163 
00164     Type*   m_pointer;
00165 };
00166 
00167 
00168 
00169 // A class similar to XalanAutoPtr, but for arrays.
00170 template<class Type>
00171 class XalanArrayAutoPtr
00172 {
00173 public:
00174 
00175     XalanArrayAutoPtr(Type*     thePointer = 0) :
00176         m_pointer(thePointer)
00177     {
00178     }
00179 
00180     XalanArrayAutoPtr(const XalanArrayAutoPtr<Type>&    theSource) :
00181         m_pointer(((XalanArrayAutoPtr<Type>&)theSource).release())
00182     {
00183     }
00184 
00185     XalanArrayAutoPtr<Type>&
00186     operator=(XalanArrayAutoPtr<Type>&  theRHS)
00187     {
00188         if (this != &theRHS)
00189         {
00190             // This test ought not to be necessary, but
00191             // MSVC 6.0 calls delete, which checks for 0.
00192             // The problem with that is the locking is
00193             // extremely expensive.
00194             if (m_pointer != 0)
00195             {
00196                 delete [] m_pointer;
00197             }
00198 
00199             m_pointer = theRHS.release();
00200         }
00201 
00202         return *this;
00203     }
00204 
00205     ~XalanArrayAutoPtr()
00206     {
00207         // See note in operator=() about this...
00208         if (m_pointer != 0)
00209         {
00210             delete [] m_pointer;
00211         }
00212     }
00213 
00214     Type&
00215     operator*() const
00216     {
00217         return *m_pointer;
00218     }
00219 
00220     Type&
00221 #if defined(XALAN_STRICT_ANSI_HEADERS)
00222     operator[](std::size_t  index) const
00223 #else
00224     operator[](size_t   index) const
00225 #endif
00226     {
00227         return m_pointer[index];
00228     }
00229 
00230     Type*
00231     get() const
00232     {
00233         return m_pointer;
00234     }
00235 
00236     Type*
00237     release()
00238     {
00239         Type* const temp = m_pointer;
00240 
00241         m_pointer = 0;
00242 
00243         return temp;
00244     }
00245 
00246     void
00247     reset(Type*     thePointer = 0)
00248     {
00249         // See note in operator=() about this...
00250         if (m_pointer != 0)
00251         {
00252             delete [] m_pointer;
00253         }
00254 
00255         m_pointer = thePointer;
00256     }
00257 
00258 private:
00259 
00260     Type*   m_pointer;
00261 };
00262 
00263 
00264 
00265 XALAN_CPP_NAMESPACE_END
00266 
00267 
00268 
00269 #endif  // if !defined(XALANAUTOPTR_HEADER_GUARD_1357924680)

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