-------------- types.hxx -------------
#include <cstdint>
#include <functional>
struct Point;
-------------- decls.hxx -------------
std::function<void()> action;
struct Point
{
   int get();
   int get() const;
};
-------------- src.cxx ------------
#include "types.hxx"
#include "decls.hxx"
int main()
{
   action();
   std::function<uint32_t(int arg1)> callA([](int arg1)->uint32_t
      {
         return 0;
      });
   (callA=[](int arg1)->uint32_t
      {
         return 100500;
      });
   return 0;
}
int Point::get()
{
   return 0;
}
int Point::get() const
{
   return 0;
}
----------------------------------