[XERCESC-1164] Forward declaration of classes-namespace problem

• Type: Bug
• Status: Resolved
• Resolution: Incomplete
• Affects Version/s: 2.4.0
• Component/s: DOM
• Environment: Operating System: Linux; Platform: PC
• Bugzilla Id: 27220
• Assignee: Unassigned
• Reporter: Amit Flashner
• Created: 25/Feb/04 21:04
• Updated: 16/Feb/11 23:38
• Resolved: 09/Apr/04 16:52

Description

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