dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Wed, Aug 31, 2011 at 09:10:21PM +0200, Martin Sandve Alnæs wrote:
> On 31 August 2011 16:12, Anders Logg <logg@xxxxxxxxx> wrote:
> > I want to declare the following function:
> >
> >  template<class S, class T>
> >  void apply_markers(S<T>& sub_domains, T sub_domain) const;
> >
> > S is a template class (either MeshFunction or MeshMarkers) and T is a
> > primitive type.
> >
> > The above declaration does not work. How should it be declared? I've
> > tried various other combinations without success.
>
>
> If you can make T a typedef in S, this works:
>
>
> template<typename V>
> class Foo
> {
> public:
>     typedef V value_type;
> };
>
> template<typename S>
> void apply_markers(S & sub_domains, typename S::value_type sub_domain)
> {
>   S s;
> }
>
> int main(int argc, char *argv[])
> {
>     Foo<int> a;
>     apply_markers< Foo<int> >(a, 3);
>     return 0;
> }

Thanks. I think I just found another solution (remains to be seen,
currently compiling...). I simply do

template<class S, class T>
void apply_markers(S& sub_domains, T sub_domain) const;

S happens to be a template type over T, but it's not necessary to
write that out explicitly in the above function definition.

--
Anders