iequatable.h

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#pragma once
#include "interface.h"
 
namespace xtd {
  template<typename type_t>
  class iequatable interface_ {
  public:
    
    virtual bool equals(const type_t&) const noexcept = 0;
    
    friend bool operator ==(const type_t& a, const type_t& b) noexcept {return a.equals(b);}
    friend bool operator !=(const type_t& a, const type_t& b) noexcept {return !a.equals(b);}
    template<typename object_t>
    friend bool operator ==(const type_t& a, const iequatable<object_t>& b) noexcept {return dynamic_cast<const type_t*>(&b) && a.equals(dynamic_cast<const type_t&>(b));}
    template<typename object_t>
    friend bool operator !=(const type_t& a, const iequatable<object_t>& b) noexcept {return !dynamic_cast<const type_t*>(&b) || !a.equals(dynamic_cast<const type_t&>(b));}
  };
}