equator.hpp

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

namespace xtd {
  namespace collections {
    namespace generic {
      namespace helpers {
        template<class key_t>
        struct equator {
          
          using first_argument_type = key_t;
          using second_argument_type = key_t;
          using result_type = bool;
          
          
          equator() = default;
          explicit equator(const xtd::collections::generic::iequality_comparer<key_t>& comparer) : comparer {&comparer} {}
          
          
          auto operator()(const first_argument_type& a, const second_argument_type& b) const -> result_type {
            if (&a == &b) return true;
            if (comparer) return comparer->equals(a, b);
            return __polymorphic_equator__<first_argument_type, typename std::is_polymorphic<first_argument_type>::type> {}(a, b);
          }

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