<xstd/bits/bit_iterator/bit_next.hpp>, <xstd/bits/bit_iterator/bit_prev.hpp>

bit_next, bit_prev

As ranges::next and ranges::prev in [range.iter.ops], with:

• Constraints: I is an iterator of ours, and for bit_prev it models bidirectional_iterator, as ranges::prev asks.
• Effects: bit_next calls bit_advance(it, n), or bit_advance(it, n, bound), on its copy it; bit_prev calls them with -n.
• Returns: it.
• Complexity: As for bit_advance.