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XNull.hpp

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00001 /*
00002  * Copyright 1999-2004 The Apache Software Foundation.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #if !defined(XNULL_HEADER_GUARD_1357924680)
00017 #define XNULL_HEADER_GUARD_1357924680
00018 
00019 
00020 
00021 // Base header file.  Must be first.
00022 #include <xalanc/XPath/XPathDefinitions.hpp>
00023 
00024 
00025 
00026 // Base class header file.
00027 #include <xalanc/XPath/XObject.hpp>
00028 
00029 
00030 
00031 XALAN_CPP_NAMESPACE_BEGIN
00032 
00033 
00034 
00035 class XALAN_XPATH_EXPORT XNull : public XObject
00036 {
00037 public:
00038 
00039     typedef XObject     ParentType;
00040 
00045     explicit
00046     XNull();
00047 
00054     XNull(const XNull&  source);
00055 
00056     virtual
00057     ~XNull();
00058 
00059     // These methods are inherited from XObject ...
00060 
00061 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00062     virtual XObject*
00063 #else
00064     virtual XNull*
00065 #endif
00066     clone(void*     theAddress = 0) const;
00067 
00068     virtual XalanDOMString
00069     getTypeString() const;
00070 
00071     virtual double
00072     num() const;
00073 
00074     virtual bool
00075     boolean() const;
00076 
00077     virtual const XalanDOMString&
00078     str() const;
00079 
00080     virtual void
00081     str(
00082             FormatterListener&  formatterListener,
00083             MemberFunctionPtr   function) const;
00084 
00085 #if !defined(XALAN_NO_USING_DECLARATION)
00086     using ParentType::str;
00087 #endif
00088 
00089     virtual double
00090     stringLength() const;
00091 
00092     virtual void
00093     ProcessXObjectTypeCallback(XObjectTypeCallback&     theCallbackObject);
00094 
00095     virtual void
00096     ProcessXObjectTypeCallback(XObjectTypeCallback&     theCallbackObject) const;
00097 
00098 private:
00099 
00100     // not implemented
00101     XNull& operator=(const XNull &);
00102 };
00103 
00104 
00105 
00106 XALAN_CPP_NAMESPACE_END
00107 
00108 
00109 
00110 #endif  // XNULL_HEADER_GUARD_1357924680

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Copyright © 1999-2004 The Apache Software Foundation. All Rights Reserved.