lesser.hpp

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#pragma once
#define __XTD_CORE_INTERNAL__
#include "../../../internal/__polymorphic_lesser.hpp"
#undef __XTD_CORE_INTERNAL__
#include "../icomparer.hpp"

namespace xtd {
  namespace collections {
    namespace generic {
      namespace helpers {
        template<class type_t = void>
        struct lesser {
          
          using first_argument_type = type_t;
          using second_argument_type = type_t;
          using result_type = bool;
          
          
          lesser() = default;
          explicit lesser(const xtd::collections::generic::icomparer<type_t>& comparer) : comparer_ {&comparer} {}
          
          
          constexpr auto operator()(const first_argument_type& lhs, const second_argument_type& rhs) const -> result_type {
            if (comparer_) return comparer_->compare(lhs, rhs) < 0;
            return __polymorphic_lesser__<first_argument_type, typename std::is_polymorphic<first_argument_type>::type> {}(lhs, rhs);
          }

          
        private:
          const xtd::collections::generic::icomparer<type_t>* comparer_ = nullptr;
        };
      }
    }
  }
}