iterator.hpp

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#pragma once
#include <iterator>
#include <tuple>
#include <type_traits>

namespace xtd {
  namespace collections {
    namespace generic {
      namespace helpers {
        
        template <class input_iterator_t>
        using iterator_value_t = typename std::iterator_traits<input_iterator_t>::value_type;
        
        template <class input_iterator_t>
        using iterator_key_t = std::remove_const_t<std::tuple_element_t<0, iterator_value_t<input_iterator_t>>>;
        
        template <class input_iterator_t>
        using iterator_mapped_t = std::tuple_element_t<1, iterator_value_t<input_iterator_t>>;
        
        template< class input_iterator_t >
        using iterator_to_allocator_t = std::pair<std::add_const_t<iterator_key_t<input_iterator_t>>, iterator_mapped_t<input_iterator_t>>;
      }
    }
  }
}