comparer.hpp

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#pragma once
#include "helpers/comparer.hpp"
#include "icomparer.hpp"
#include "../../helpers/throw_helper.hpp"
#include "../../object.hpp"
#include "../../ptr.hpp"

namespace xtd {
  namespace collections {
    namespace generic {
      template<class type_t>
      class comparer : public xtd::object, public xtd::collections::generic::icomparer<type_t> {
      public:
        
        using first_argument_type = type_t;
        using second_argument_type = type_t;
        using result_type = xtd::int32;
        
        
        static const comparer<type_t> default_comparer;
        
        
        [[nodiscard]] auto compare(const first_argument_type& x, const second_argument_type& y) const -> result_type override {
          if constexpr(xtd::helpers::strictly_ordered<first_argument_type> || std::derived_from<first_argument_type, xtd::icomparable<first_argument_type>>) return helpers::comparer<type_t> {}(x, y);
          else xtd::helpers::throw_helper::throws(xtd::helpers::exception_case::invalid_operation, "Failed to compare two elements in the array.");
        }
        
        //static ptr<comparer<type_t>> create (xtd::comparison<type_t> comparison) {
        //  return {};
        //}
        
      protected:
        
        comparer() = default;
      };
      
      template<class type_t>
      inline const comparer<type_t> comparer<type_t>::default_comparer;
    }
  }
}