Hi,

Can anyone tell the reason why the following code can be compiled
using g++-4.1 while g++-4.2 throws a compilation error?

template<class A, class B = int>
class foo{
public:
A i;
B j;
};

template<class A = int, template<class>class B = foo>
class bar : public B<A>{
public:
A k;
};

int main(){
bar<> test;

test.k = test.j = test.i = 0;

return 0;
}

On Oct 15, 11:03 am, Alpha <xinhaoy...@gmail.com> wrote:
> Hi,
>
> Can anyone tell the reason why the following code can be compiled
> using g++-4.1 while g++-4.2 throws a compilation error?
>
> template<class A, class B = int>
> class foo{
> public:
> A i;
> B j;
>
> };
>
> template<class A = int, template<class>class B = foo>

template <class A=int, template <class, class=int>class B = foo>

Thats the right way.

> class bar : public B<A>{
> public:
> A k;
>
> };
>
> int main(){
> bar<> test;
>
> test.k = test.j = test.i = 0;
>
> return 0;
>
> }

-N