https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120682
--- Comment #6 from Benjamin Schulz <schulz.benjamin at googlemail dot com> --- Jakub Jelinek wrote: > The reason why it is invalid is that T lookup fails in the declare mapper > > definition. Yes, And that exactly is the problem. > #pragma omp declare mapper(myvec<double> v) map(v, v.data[0:v.len]) > instead of your line would be valid Yes, but usually, one defines the template type only when one is using the template. Say, I want to use myvec with doubles, floats, ints, In the current implementation, I would then have to define 3 separate mappers. One for the float, one for the int and another for the double template parameter... In c++ templates are there that you do not have to write specific code for all these types separately. Once you have to write long code for each datatype, then a template is useless..
