Swift Combine：无法推断复杂的闭包返回类型错误

Question

I have the following function:我有以下功能：

func generateIn() -> Future<Int,Never> {
    return Future{ promise in
        promise(.success(Int.random(in: 1...10)))
    }
}

and I'm calling that function from this variable:我从这个变量调用该函数：

let sub2 = generateIn()
    .map { value in
        print(value)
        return Int(value)
    }

But I'm getting this error:但我收到此错误：

Unable to infer complex closure return type; add explicit type to disambiguate

Any of you knows why I'm getting this error or how can fix it?你们中的任何人都知道为什么我会收到此错误或如何解决它？

I'll really appreciate your help我会非常感谢你的帮助

Answer 1

Do what it asks you to do;做它要求你做的事情； tell it what type the closure is.告诉它闭包是什么类型。

    let sub2 = generateIn()
        .map { (value:Int) -> Int in
            print(value)
            return Int(value)
        }