icomparable.h

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#pragma once
#include "interface.h"
#include "object.h"
#include "is.h"

namespace xtd {
  template <typename type_t>
  class icomparable interface_ {
  public:
    
    virtual int32_t compare_to(const object& obj) const noexcept {
      if (!is<type_t>(&obj)) return 1;
      return compare_to(static_cast<const type_t&>(obj));
    }
    
    virtual int32_t compare_to(const type_t& obj) const noexcept = 0;
    
    // Not correct for an interface but necessary for C++ language.
    bool operator<(const object& obj) const noexcept { return compare_to(obj) < 0; }
    bool operator<=(const object& obj) const noexcept { return compare_to(obj) <= 0; }
    bool operator>(const object& obj) const noexcept { return compare_to(obj) > 0; }
    bool operator>=(const object& obj) const noexcept { return compare_to(obj) >= 0; }
    bool operator<(const type_t& obj) const noexcept { return compare_to(obj) < 0; }
    bool operator<=(const type_t& obj) const noexcept { return compare_to(obj) <= 0; }
    bool operator>(const type_t& obj) const noexcept { return compare_to(obj) > 0; }
    bool operator>=(const type_t& obj) const noexcept { return compare_to(obj) >= 0; }
  };
}