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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/iota_view/deduction_guides.html below:

deduction guides for std::ranges::iota_view - cppreference.com

template< class W, class Bound >

    requires (!/*is-integer-like*/<W> ||
              !/*is-integer-like*/<Bound> ||
              /*is-signed-integer-like*/<W> == /*is-signed-integer-like*/<Bound>)

iota_view( W, Bound ) -> iota_view<W, Bound>; (since C++20)

This deduction guide is provided for iota_view to allow deduction from an initial value and a bounding value.

For the definitions of /*is-integer-like*/ and /*is-signed-integer-like*/, see is-integer-like .

Note that the guide protects itself against bugs arising from sign mismatch, like views::iota(0, v.size()), where ​0​ is signed and v.size() is unsigned.

[edit] Example 
#include <cassert>
#include <ranges>
 
int main()
{
    auto io = std::ranges::iota_view(1L, 7L); // deduces W and Bound as “long”
    assert(io.front() == 1L and io.back() == 6L);
}

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