how to declare a class inside a namespace without include total .h file?

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like mention above!
For many reasons , we just to simple declare some classes rather include total interface header file in the main .h file(if that's not acquired,e.g that class instance as the class member etc).

we all know,To just declare a class is simple. just

C++

"class xml_document"

but while the class xml_document is reside namespace pugi.

How can I accomplish it?
I have trie :

C++

namespace pugi;
class pugi::xml_document;
pugi::xml_document &amp; getXmlDoc()const;

but compiler compain about the first line. thanks

Posted 27-Oct-14 22:34pm

jiazhiqiang

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3 solutions

Solution 1

Remove the semicolon:

C++

namespace SomeLib
   {
   class String { ... };
   }

See here: http://msdn.microsoft.com/en-us/library/5cb46ksf.aspx[^]

Posted 27-Oct-14 22:45pm

OriginalGriff

Solution 3

I have find the answer! thanks any way!

http://www.devx.com/tips/Tip/32118

Posted 27-Oct-14 22:56pm

jiazhiqiang

Comments

Legor 28-Oct-14 6:46am

Thats what the above solutions told you.

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Richard MacCutchan · Accepted Answer · 2014-10-27T22:48:00

Your syntax is not correct, you need to use block identifiers at the beginning and end of the class and the namespace, like:

C++

namespace pugi // start namespace definition
{
    class xml_document // start class definition
    {
        xml_document& getXmlDoc()const;

    } // end of class definition

} // end of namespace definition