Utils.hpp

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#pragma once
#include <tuple>
 
namespace Jug::Utils {
 
  /** Enumerate helper.
   *
   * ref: https://www.reedbeta.com/blog/python-like-enumerate-in-cpp17/
   */
  template <typename T, typename TIter = decltype(std::begin(std::declval<T>())),
            typename = decltype(std::end(std::declval<T>()))>
  constexpr auto Enumerate(T&& iterable)
  {
    struct iterator
    {
        size_t i;
        TIter iter;
        bool operator != (const iterator & other) const { return iter != other.iter; }
        void operator ++ () { ++i; ++iter; }
        auto operator * () const { return std::tie(i, *iter); }
    };
    struct iterable_wrapper
    {
        T iterable;
        auto begin() { return iterator{ 0, std::begin(iterable) }; }
        auto end() { return iterator{ 0, std::end(iterable) }; }
    };
    return iterable_wrapper{ std::forward<T>(iterable) };
}
 
} // namespace Jug::Utils