字典错误：成员'+'的模糊引用 [英] Dictionary error: Ambiguous reference to member '+'

问题描述

我在swift 3方法中有以下代码：

I have the following code in a swift 3 method:

let dict = ["A": 1, "B": 2, "C": 3]
let sum = dict["A"]! + dict["B"]! + dict["C"]!

由于对成员'+'的模糊引用，代码无法编译错误。但是如果我尝试只添加两个元素，它就会按预期编译并运行。

The code does not compile because of the Ambiguous reference to member '+' error. But if I try to add only two elements it compile and works as expected.

let dict = ["A": 1, "B": 2, "C": 3]
let sum = dict["A"]! + dict["B"]!

正常工作。

我错过了什么语言应该起作用？

Am I missing something from how the language should work?

推荐答案

另一种解决方法：

let dict = ["A": 1, "B": 2, "C": 3]
let sum = 0 + dict["A"]! + dict["B"]! + dict["C"]!

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