How do I write an ADL-enabled trailing return type, or noexcept specification?

Question

Imagine I\'m writing some container template or something. And the time comes to specialize std::swap for it. As a good citizen, I\'ll enable ADL by doing somet

Answer 1

I think I would move it into a separate namespace

namespace tricks {
    using std::swap;

    template 
    void swap(T &t, U &u) noexcept(noexcept(swap(t, u)));
}

template 
void swap(my_template& x, my_template& y)
  noexcept(noexcept(tricks::swap(std::declval(), std::declval()))) 
{
    using std::swap;
    swap(x.something_that_is_a_T, y.something_that_is_a_T);
}

Alternatively you can move the whole code up into tricks and delegate to there.