DO NOT REPLY [Bug 27220] New: - Forward declaration of classes-namespace problem

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=27220

Forward declaration of classes-namespace problem

           Summary: Forward declaration of classes-namespace problem
           Product: Xerces-C++
           Version: 2.4.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: DOM
        AssignedTo: xerces-c-dev@xml.apache.org
        ReportedBy: amit.flashner@comverse.com


I created classes that wrap Xerces functionality. 
The users of my classes don't need to know Xerces, only these classes.
The classes have private pointers to DOMDocument and DOMElement.
I order to prevent the need to include the xerces header files, I tried to
forward declare them in my header file like this:
namespace xercesc {
	class DOMDocument;
	class DOMElement;
};

but this didn't compile claiming that namespace aliases can't be used.
Changing to this:
XERCES_CPP_NAMESPACE_BEGIN
	class DOMDocument;
	class DOMElement;
XERCES_CPP_NAMESPACE_END

worked, but again, my users will have to know these macros (which declared only
in xerces header files).
Of course I can change the namespace directly to xercesc_2_5_0, but this will
force me to to change it each time I upgrade.

I'm using gcc 3.2.3

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