On Tuesday, 6 August 2013 at 05:07:51 UTC, Ali Çehreli wrote:
On 08/05/2013 09:51 PM, kdmult wrote:
On Monday, 5 August 2013 at 18:45:49 UTC, kdmult wrote:
class A(P...) {}
class B(R = A!P, P...) {}
P... should be rightmost, so how can I use it in the
preceding parameter?
The default parameter value doesn't make sense as it's shown
above.
Actually I want to port C++ code which looks like below.
template <typename P1>
class A1 {};
template <typename P1, typename R=A1<P1> >
class B1 {}
template <typename P1, typename P2>
class A2 {};
template <typename P1, typename P2, typename R=A2<P1,P2> >
class B2 {}
and so on.
I would use the variadic template parameters. However, I have
no idea
how it can be done. Please advise.
Thanks.
Direct translation seems to work:
class A1(P1) {}
class B1(P1, R = A1!P1) {}
class A2(P1, P2) {}
class B2(P1, P2, R = A2!(P1, P2)) {}
void main()
{
auto a1 = new A1!int;
auto b1d = new B1!int;
auto b1 = new B1!(int, A1!double);
auto a2 = new A2!(int, double);
auto b2d = new B2!(int, double);
auto b2 = new B2!(int, double, A2!(char, short));
}
Ali
Is there a way to use variadic template/class parameter instead
of P1, P2, ..., PN ? If it is I could create 2 templated classes
instead of all that copy/pasted classes with P1, P2, etc
parameters.
Thanks.
