Interval.hpp

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/*
 * Interval.hpp
 *
 * A small class for returning non-owning view of some storages.
 * It stores a pointer and an interval.
 *
 *  Created on: 05 Apr 2022
 *   Author(s): Jorn Reniers, Volkan Kumtepeli
 */
 
#pragma once
 
#include <vector>
 
namespace slide {
 
template <typename Tcontainer>
class Interval
{
  Tcontainer *root{ nullptr };
  int beg{ 0 }, en{ 0 };
 
public:
  Interval() = default;
 
  Interval(Tcontainer &data) : root(&data), en(data.size() - 1) {}
 
  Interval(Tcontainer &data, int begin_, int end_) : root(&data), beg(begin_), en(end_) {}
 
  [[nodiscard]] constexpr auto begin() noexcept { return std::begin(*root) + beg; }
  [[nodiscard]] constexpr auto end() noexcept { return std::begin(*root) + en; }
 
  [[nodiscard]] constexpr auto cbegin() const noexcept { return std::advance(std::cbegin(*root), beg); }
  [[nodiscard]] constexpr auto cend() const noexcept { return std::advance(std::cbegin(*root), en); }
};
} // namespace slide