Set.h

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#ifndef INCLUDE_SET_H_
#define INCLUDE_SET_H_
 
#include <utility>
 
namespace Set
{
    template <class Key_T, class Other_T = Key_T>
    struct Set
    {
        // Member variables
        Key_T key_;     
        Other_T other_; 
 
        // Member functions
        explicit Set(const Key_T &key, const Other_T &other = Other_T{}) : key_{key}, other_{other} {}
 
        // Non-member function overloads
        friend bool operator<(const Set &lhs, const Set &rhs) { return lhs.key_ < rhs.key_; }
 
        friend bool operator>(const Set &lhs, const Set &rhs) { return lhs.key_ > rhs.key_; }
 
        friend bool operator<=(const Set &lhs, const Set &rhs) { return lhs.key_ <= rhs.key_; }
 
        friend bool operator>=(const Set &lhs, const Set &rhs) { return lhs.key_ >= rhs.key_; }
 
        friend bool operator==(const Set &lhs, const Set &rhs) { return lhs.key_ == rhs.key_; }
 
        friend bool operator!=(const Set &lhs, const Set &rhs) { return lhs.key_ != rhs.key_; }
    };
} // namespace Set
 
#endif /* INCLUDE_SET_H_ */