how to derive a class from 2 WTL classes

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Hi all

I have a button class :

class CTransparentBtn : virtual public CWindowImpl<ctransparentbtn, WTL::CButton, CControlWinTraits>
{
// ...
};

and I've found this class for menu button from codeproject.com

namespace WTLEX
{

template <bool class="" tbase="WTL::CButton," twintraits="CControlWinTraits">
class ATL_NO_VTABLE CMenuButtonImpl : public CWindowImpl< T, TBase, TWinTraits>
{
// ...
};

class CMenuButton : public CMenuButtonImpl<false, CMenuButton>
{
// ...
};

} //namespace WTLEX</bool>

so How can I derive "CMenuButton" from "CTransparentBtn" to use CTransparentBtn's functions??

thank u in advance

Posted 20-May-11 23:16pm

bartello

Updated 21-May-11 1:16am

v3

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2 solutions

Solution 1

wouldn't you go the other way?

class CTransparentBtn : public CMenuButtonImpl<ctransparentbtn,wtl::cbutton,ccontrolwintraits>
{
// ...
};

Posted 21-May-11 0:58am

barneyman

Comments

bartello 21-May-11 7:20am

thanks! but it's harder than u think. In this case I had to add some template arguments to class CTransparentBtn. I'd like to know the answer to MY question.

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barneyman · Accepted Answer · 2011-05-21T14:15:00

Solution 2

you're still going to have to template your CTransparentBtn if you go the other way

template <class theClass, class theBase>
class CTransparentBtn : public CWindowImpl<theClass, theBase, CControlWinTraits>

then

template <class theClass,class theBase>
class ATL_NO_VTABLE CMenuButtonImpl : public CTransparentBtn <theClass, theBase>

Posted 21-May-11 14:15pm

barneyman

Comments

bartello 22-May-11 15:42pm

Ok!! thanks a lot!! :)