namespace a {
  namespace b {
    namespace c {
    // declaration
    template <typename Val, typename Cl>
    class foo
    {
       void mark_updated(t1 b, t2 e);
    };

...
    // definition
    template <typename Val, typename C1>
    void a::b::c::foo<Val, C1>::mark_updated(t1 b, t2 e)
    {
    // find next/prev does not work inside this method
    }

  }
 }
}

namespace a{ namespace b{ namespace c{...
   template <typename Val, typename C1>
   void foo::mark_updated(...)
   {
   // now it works
   }

quote:

---

Originally posted by feline
... Thank you for the clear description.

---

template <typename Value>
void foo<Value>::function()

template <typename Value>
class foo
{
   template <typename Value> void foo<Value>::function();
};