字典错误:对成员“+"的不明确引用 [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'+'的不明确引用错误，代码无法编译.但是，如果我尝试只添加两个元素，它会编译并按预期工作.

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"]!

工作正常.

我是否遗漏了语言应该如何工作的内容?

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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