如何在Swift中优雅地比较元组？ [英] How to elegantly compare tuples in Swift?

问题描述

我有两个不同的类型的元组（Double，Double）：

I do have 2 different tuples of type (Double, Double):

let tuple1 : (Double, Double) = (1,2)
let tuple2 : (Double, Double) = (3,4)

我想使用一个简单的if语句来比较它们的值。像：

I want to compare their values using a simple if statement. Something like:

if (tuple1 == tuple2){
    // Do stuff
}

这会抛出以下错误：

无法为接受所提供的
参数的'=='找到重载

Could not find an overload for '==' that accepts the supplied arguments

是这样的函数：

func compareTuples <T:Equatable> (tuple1:(T,T),tuple2:(T,T)) -> Bool{
    return (tuple1.0 == tuple2.0) && (tuple1.1 == tuple2.1)
}

我真的不喜欢这个解决方案寻找更优雅的东西。我已经试图写一个扩展，但不能使它工作的元组。

I really dislike this solution and search for something more elegant. I already tried to write an extension but can't make it work for tuples. Do you have a good solution for this problem?

推荐答案

请尝试以下操作：

func == <T:Equatable> (tuple1:(T,T),tuple2:(T,T)) -> Bool
{
   return (tuple1.0 == tuple2.0) && (tuple1.1 == tuple2.1)
}

，但我叫它 == 。然后像：

It's exactly the same as yours, but I called it ==. Then things like:

(1, 1) == (1, 1)

是真的，

(1, 1) == (1, 2)

为假

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