Re: [boost] [multiprecision] Creation from a range

Is there any way to create an Integer (or a number) from a range (bounded or counted)?; or from a string_view (string_ref)?

Roughly speaking, something like:

XintXXX_t make_from_bounded_range(I f, I l); XintXXX_t make_from_counted_range(I f, size_t n);

What are the semantics? Is this a measure? Like an integer distance between borders?