检查接口的平等{} [英] Checking equality of interface{}

问题描述

我正在为给定的界面{} 值搜索 [] interface {} 片段：

  var v interface {} 
 for i：= 0;我< LEN（A）; i ++ {
 if（A [i] == v）{
 fmt.Println（Gotcha！）
 break 
} 
} 
  

在普通情况下，类型是 int 。然而，我应该怎么做，例如，类型是一些自定义 struct ？

解决方案

感谢@CodingPickle评论，我从 Go编程语言规范

等号运算符==和！=适用于可比的操作数。

关于界面{} s和 structs ：

• 接口值具有可比性。如果两个接口值具有相同的动态类型和相同的动态值，或者两者的值均为零，那么两个接口值相等。


• 非接口类型X的值x和接口类型T的值t如果类型X的值是可比的，并且X实现了T，那么它们是可比的。如果t的动态类型与X完全相同，并且t的动态值等于x，则它们是相等的。
  
• 所有的领域都是可比的。如果相应的非空白字段相等，则两个结构值相等。

换句话说，在Go中处理平等似乎很容易！

I am searching a []interface{} slice for a given interface{} value:

var v interface{}
for i := 0; i < len(A); i++ {
  if (A[i] == v) {
    fmt.Println("Gotcha!")
    break
  }
}

In the trivial case the types are int. However what should I do if, for example, the types are some custom struct?

解决方案

Thanks to @CodingPickle comment, I provide the following from the Go Programming Language Specification

The equality operators == and != apply to operands that are comparable.

Regarding interface{}s and structs:

• Interface values are comparable. Two interface values are equal if they have identical dynamic types and equal dynamic values or if both have value nil.
• A value x of non-interface type X and a value t of interface type T are comparable when values of type X are comparable and X implements T. They are equal if t's dynamic type is identical to X and t's dynamic value is equal to x.
• Struct values are comparable if all their fields are comparable. Two struct values are equal if their corresponding non-blank fields are equal.

In other words, handling equality seems easy in Go!

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