hasher.hpp

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#pragma once
#define __XTD_CORE_INTERNAL__
#include "../../../internal/__polymorphic_hasher.hpp"
#undef __XTD_CORE_INTERNAL__
#include "../iequality_comparer.hpp"

namespace xtd {
  namespace collections {
    namespace generic {
      namespace helpers {
        template<class key_t>
        struct hasher {
          
          using argument_type = key_t;
          using result_type = xtd::size;
          
          
          hasher() = default;
          explicit hasher(const xtd::collections::generic::iequality_comparer<key_t>& comparer) : comparer {&comparer} {}
          
          
          auto operator()(const argument_type& key) const -> result_type {
            if (comparer) return comparer->get_hash_code(key);
            return __polymorphic_hasher__<argument_type, typename std::is_polymorphic<argument_type>::type> {}(key);
          }

          
        private:
          const xtd::collections::generic::iequality_comparer<key_t>* comparer = nullptr;
        };
      }
    }
  }
}