Re: Multiple inheritance/interface delegate through template function not working

From:
Kai-Uwe Bux <jkherciueh@gmx.net>
Newsgroups:
comp.lang.c++
Date:
Sun, 01 Jul 2007 20:57:01 +0200
Message-ID:
<f68tfh$pm7$1@murdoch.acc.Virginia.EDU>
 roman.blackhammer@gmail.com wrote:

#include <iostream>

class PureVirtual
{
public:

virtual void VirtFun() = 0;
};

template <long I, class T>
class TPureVirtual : public PureVirtual
{
public:

virtual void VirtFun()
{
// 1.
static_cast<T&>(*this).Done(I);

// 2.
static_cast<T&>(*this).TDone<I>();


Try:

    static_cast<T&>(*this).T::template TDone<I>();

The compiler does not think that TDone is a template. Thus, it tries hard to
compare a member function to an int, which does not work.

}
};

class ImplVirtual : public TPureVirtual<1, ImplVirtual>,
public TPureVirtual<2, ImplVirtual>
{
public:

void
Done(long I)
{
std::cout << "ImplVirtual<" << I << ">::Done" << std::endl;
}

template <long I> void
TDone()
{
std::cout << "ImplVirtual<" << I << ">::TDone" << std::endl;
}
};

extern "C" int
main( int ? ? ? ? ? argc,
const char ? ?**argv )
{
ImplVirtual impl;

TPureVirtual<1, ImplVirtual> *pv1 = static_cast< TPureVirtual<1,
ImplVirtual>* >(&impl);
pv1->VirtFun();

TPureVirtual<2, ImplVirtual> *pv2 = static_cast< TPureVirtual<2,
ImplVirtual>* >(&impl);
pv2->VirtFun();

return 0;
}


Best

Kai-Uwe Bux

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