I want put the definition of a view in a separate compilation unit, but to export the view I need it's type.

```
// .h
auto GetView(int index, int size);
// .cpp
auto GetView(int index, int size)
{
    auto view = ranges::views::ints(-2, 3)
        | ranges::views::transform([=](auto i)
            {
                return i + index;
            }
        )
        | ranges::views::enumerate
        | ranges::views::filter([=](auto i)
            {
                return i.second >= 0 && i.second < size;
            }
        )
        ;
}

```

I'm going to answer this one myself but maybe someone can make some helpful comments.