__polymorphic_lesser.hpp

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#pragma once
#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif
 
#include "../icomparable.hpp"
#include <functional>
#include <type_traits>
 
template<class type_t, class bool_t>
struct __polymorphic_lesser__ {};
 
template<class type_t>
struct __polymorphic_lesser__<type_t, std::true_type> {
  bool operator()(const type_t& lhs, const type_t& rhs) const {
    if (dynamic_cast<const xtd::icomparable<type_t>*>(&lhs)) return dynamic_cast<const xtd::icomparable<type_t>&>(lhs).compare_to(rhs) < 0;
    return std::less<type_t> {}(lhs, rhs);
  }
};
 
template<class type_t>
struct __polymorphic_lesser__<type_t, std::false_type> {
  bool operator()(const type_t& lhs, const type_t& rhs) const {return std::less<type_t> {}(lhs, rhs);}
};