在Golang中传递接口{}或[]接口{} [英] Passing interface{} or []interface{} in Golang

问题描述

使用此代码段，为什么它允许接口{}传递到函数而不是[]接口。有什么区别？我知道错误说的是什么（已将其评论到函数中），但我不确定错误的含义。

With this snippet, why does it allow interface{} to pass into the function but not []interface. And what's the difference? I know what the error says (have commented it into the function), but I'm not sure what the error means.

https://play.golang.org/p/689R_5dswFX

package main

type smsSendRequest struct {
    Recipients     string `json:"recipients"`
}

// func action(pass interface{}) {
//     //works
// }

func action(pass []interface{}) {
    //cannot use data (type *smsSendRequest) as type []interface {} in argument to action
}

func main() {
    to := "15551234567"
    var data = &smsSendRequest{
        Recipients:     to,
    }
    action(data)
}

推荐答案

类型 interface {} 可用作非常通用的类型将允许任何其他类型分配给它。

The type interface{} can be used as a very generic type that would allow any other type to be assigned to it.

所以如果函数接收ives interface {} ，你可以传递任何值。

So if a function receives interface{}, you can pass any value to it.

这是因为在Go中，对于一个类型为了满足接口，它必须实现接口声明的所有方法。

That is because in Go, for a type to satisfy an interface it must just implement all methods the interface declares.

由于 interface {} 是一个空接口，任何类型都会满足它。

Since interface{} is an empty interface, any type will satisfy it.

另一方面，对于满足 [] interface {} 的类型它必须是空接口的实际片段。

On the other hand, for a type to satisfy []interface{} it must be an actual slice of empty interfaces.

因此，如果您需要一个可以接收任何值的泛型函数，只需使用 interface {} 正如您在示例中所示。

So if you need a generic function that can receive any value, just use interface{} as you show in your example.

请注意 interface {} 将允许您传递值或指针引用，因此您可以将指针或值隐约传递给该函数。

Note that interface{} will allow you to pass in either value or pointer references, so you can pass in pointers or values indistinctly to that function.

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