template question again

[booker]

The following codes can't pass compilation in vc7.1,
error occured at the possition where Foo is called.

*************** *************** *************** *************** 8
template<typena me type>
class base1
{
template<typena me type> class base2;
private:
typedef base2<type> base2type;
public:
virtual void Foo(base2type*) =0;
};

template<typena me type2>
class base2
{
};

template<typena me type>
class derive
:public base1<type>
,public base2<type>
{
typedef base2<type> base2type;
virtual void Foo(base2type*) {}
};

int main(int argc, char* argv[])
{
derive<unsigned > * devptr=new derive<unsigned >;
base1<unsigned> * baseptr=devobj;
baseptr->Foo(devptr);
return 0;
}

[booker]

Re: template question again

the problem is solved thanks

"booker" <huangshuhuai@k ingsoft.net> дÈëÓʼþ
news:uZ6oVAryDH A.3116@tk2msftn gp13.phx.gbl...[color=blue]
> The following codes can't pass compilation in vc7.1,
> error occured at the possition where Foo is called.
>
> *************** *************** *************** *************** 8
> template<typena me type>
> class base1
> {
> template<typena me type> class base2;
> private:
> typedef base2<type> base2type;
> public:
> virtual void Foo(base2type*) =0;
> };
>
> template<typena me type2>
> class base2
> {
> };
>
> template<typena me type>
> class derive
> :public base1<type>
> ,public base2<type>
> {
> typedef base2<type> base2type;
> virtual void Foo(base2type*) {}
> };
>
> int main(int argc, char* argv[])
> {
> derive<unsigned > * devptr=new derive<unsigned >;
> base1<unsigned> * baseptr=devobj;
> baseptr->Foo(devptr);
> return 0;
> }
>
>[/color]