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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 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
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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
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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 <PlatformSupport/PlatformSupportDefinitions.hpp>
00064 
00065 
00066 
00067 #include <cstddef>
00068 
00069 
00070 
00071 // We're using our own auto_ptr-like class due to wide
00072 // variations amongst the varous platforms we have to
00073 // support
00074 template<class Type>
00075 class XalanAutoPtr
00076 {
00077 public:
00078 
00079     XalanAutoPtr(Type*  thePointer = 0) :
00080         m_pointer(thePointer)
00081     {
00082     }
00083 
00084     XalanAutoPtr(const XalanAutoPtr<Type>&  theSource) :
00085         m_pointer(((XalanAutoPtr<Type>&)theSource).release())
00086     {
00087     }
00088 
00089     XalanAutoPtr<Type>&
00090     operator=(XalanAutoPtr<Type>&   theRHS)
00091     {
00092         if (this != &theRHS)
00093         {
00094             // This test ought not to be necessary, but
00095             // MSVC 6.0 calls delete, which checks for 0.
00096             // The problem with that is the locking is
00097             // extremely expensive.
00098             if (m_pointer != 0)
00099             {
00100                 delete m_pointer;
00101             }
00102 
00103             m_pointer = theRHS.release();
00104         }
00105 
00106         return *this;
00107     }
00108 
00109     ~XalanAutoPtr()
00110     {
00111         // See note in operator=() about this...
00112         if (m_pointer != 0)
00113         {
00114             delete m_pointer;
00115         }
00116     }
00117 
00118     Type&
00119     operator*() const
00120     {
00121         return *m_pointer;
00122     }
00123 
00124     Type*
00125     operator->() const
00126     {
00127         return m_pointer;
00128     }
00129 
00130     Type*
00131     get() const
00132     {
00133         return m_pointer;
00134     }
00135 
00136     Type*
00137     release()
00138     {
00139         Type* const temp = m_pointer;
00140 
00141         m_pointer = 0;
00142 
00143         return temp;
00144     }
00145 
00146     void
00147     reset(Type*     thePointer = 0)
00148     {
00149         // See note in operator=() about this...
00150         if (m_pointer != 0)
00151         {
00152             delete m_pointer;
00153         }
00154 
00155         m_pointer = thePointer;
00156     }
00157 
00158 private:
00159 
00160     Type*   m_pointer;
00161 };
00162 
00163 
00164 
00165 // A class similar to XalanAutoPtr, but for arrays.
00166 template<class Type>
00167 class XalanArrayAutoPtr
00168 {
00169 public:
00170 
00171     XalanArrayAutoPtr(Type*     thePointer = 0) :
00172         m_pointer(thePointer)
00173     {
00174     }
00175 
00176     XalanArrayAutoPtr(const XalanArrayAutoPtr<Type>&    theSource) :
00177         m_pointer(((XalanArrayAutoPtr<Type>&)theSource).release())
00178     {
00179     }
00180 
00181     XalanArrayAutoPtr<Type>&
00182     operator=(XalanArrayAutoPtr<Type>&  theRHS)
00183     {
00184         if (this != &theRHS)
00185         {
00186             // This test ought not to be necessary, but
00187             // MSVC 6.0 calls delete, which checks for 0.
00188             // The problem with that is the locking is
00189             // extremely expensive.
00190             if (m_pointer != 0)
00191             {
00192                 delete [] m_pointer;
00193             }
00194 
00195             m_pointer = theRHS.release();
00196         }
00197 
00198         return *this;
00199     }
00200 
00201     ~XalanArrayAutoPtr()
00202     {
00203         // See note in operator=() about this...
00204         if (m_pointer != 0)
00205         {
00206             delete [] m_pointer;
00207         }
00208     }
00209 
00210     Type&
00211     operator*() const
00212     {
00213         return *m_pointer;
00214     }
00215 
00216     Type&
00217 #if defined(XALAN_SIZE_T_IN_NAMESPACE_STD)
00218     operator[](std::size_t  index) const
00219 #else
00220     operator[](size_t   index) const
00221 #endif
00222     {
00223         return m_pointer[index];
00224     }
00225 
00226     Type*
00227     get() const
00228     {
00229         return m_pointer;
00230     }
00231 
00232     Type*
00233     release()
00234     {
00235         Type* const temp = m_pointer;
00236 
00237         m_pointer = 0;
00238 
00239         return temp;
00240     }
00241 
00242     void
00243     reset(Type*     thePointer = 0)
00244     {
00245         // See note in operator=() about this...
00246         if (m_pointer != 0)
00247         {
00248             delete [] m_pointer;
00249         }
00250 
00251         m_pointer = thePointer;
00252     }
00253 
00254 private:
00255 
00256     Type*   m_pointer;
00257 };
00258 
00259 
00260 
00261 #endif  // if !defined(XALANAUTOPTR_HEADER_GUARD_1357924680)

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