prev.h

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#pragma once
 
#include "di/container/concepts/bidirectional_iterator.h"
#include "di/container/iterator/advance.h"
#include "di/container/meta/iterator_ssize_type.h"
 
namespace di::container {
struct PrevFunction {
    template<concepts::BidirectionalIterator Iter>
    constexpr auto operator()(Iter iterator) const -> Iter {
        --iterator;
        return iterator;
    }
 
    template<concepts::BidirectionalIterator Iter>
    constexpr auto operator()(Iter iterator, meta::IteratorSSizeType<Iter> n) const -> Iter {
        container::advance(iterator, -n);
        return iterator;
    }
 
    template<concepts::BidirectionalIterator Iter>
    constexpr auto operator()(Iter iterator, meta::IteratorSSizeType<Iter> n, Iter bound) const -> Iter {
        container::advance(iterator, -n, bound);
        return iterator;
    }
};
 
constexpr inline auto prev = PrevFunction {};
}
 
namespace di {
using container::prev;
}