#include <boost/parameter/name.hpp>
#include <boost/parameter/preprocessor.hpp>

BOOST_PARAMETER_NAME(tag_1)

struct A {
  A() = default;
  A(const A&) = delete;
  A(A&&) = delete;
};

struct constructor_impl {
  template<typename ArgumentPack>
  constructor_impl(ArgumentPack const&)
  {
  }
};

struct B :
  private constructor_impl
{
  BOOST_PARAMETER_CONSTRUCTOR(
      B,
      (constructor_impl),
      tag,
      (required
        (in_out(tag_1), (A))
      )
    )
};

int main()
{
  A a;
  B b(a);
}