SetTest.swift

//: Playground - noun: a place where people can play

import UIKit

class Hoge: NSObject, Comparable {
    let text:String
    
    init(text:String) {
        self.text = text
    }
    
    static func ==(x: Hoge, y: Hoge) -> Bool {
        return x.text == y.text
    }
    
    static func <(x: Hoge, y: Hoge) -> Bool {
        return x.text > y.text
    }
    
    override var hashValue: Int {
        return text.hashValue
    }
}

let a = Hoge(text:"ほげ")
let b = Hoge(text:"ほげ")

a == b　//なんとtrue

var set:Set<Hoge> = []

set.insert(a)
set.insert(b)

set.count //2!!