Hi,
Sometimes we need to view a value as a variant and we don't want to copy
the value into a variant.
It'd be great if there's a variant::view that works like a variant but
holds a reference to the value instead.
The constructor should allow any reference to the types as in the variant,
and a constructor that takes a reference to the variant, e.g.
template<class T1, class T2...>
class variant<T1, T2...>::view
{
view(T1&);
view(T2&);
...
view(variant&);
};
And we can use apply_visitor/get on a view as on a variant.
Thoughts?
Thanks.
