iequatable.h

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

namespace xtd {
  template<typename type_t>
  class iequatable interface_ {
  public:
    
    virtual bool equals(const type_t&) const noexcept = 0;
    
    virtual bool equals(const object&) const noexcept = 0;
    
    // Not correct for an interface but necessary for C++ language.
    friend bool operator==(const type_t& a, const type_t& b) {return a.equals(b);}
    friend bool operator!=(const type_t& a, const type_t& b) {return !a.equals(b);}
    friend bool operator==(const type_t& a, const object& b) {return a.equals(b);}
    friend bool operator!=(const type_t& a, const object& b) {return !a.equals(b);}
  };
}