An iterator for map, map_convert. Should be created with one of those functions. If one of the operations is not avaliable, it's eve::algo::nothing_t.
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#include <eve/module/algo/algo/views/map.hpp>
Required header: #incude <eve/module/algo/algo/views/map.hpp>
Has a shorthand eve::views::map_iterator in <eve/views/map.hpp>