Golang中奇怪的类型定义语法（名称，然后键入，然后是字符串文字）

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=noreferrer> 中的Struct types 部分：

  //与TimeStamp协议缓冲区相对应的结构体。 
 //标记字符串定义协议缓冲区字段号。 
 struct {
 microsec uint64field 1
 serverIP6 uint64field 2
 process stringfield 3
} 
  

I've been trying to find out how to use mgo (MongoDB driver for Go) and I came across this struct declaration:

type Something struct {
    Id bson.ObjectId "_id,omitempty"
    Name string
}

I don't quite understand the syntax of the first element (Id). I understand that it's being declared as type bson.ObjectId, but what is the string literal doing there?

My question is not about the mgo driver functionality,
but about this strange <name> <type> <string_literal> syntax.

I couldn't find anything on the Go specs, and I don't know how to google this either.

解决方案

It's explained in the Struct types section of the language specification:

// A struct corresponding to the TimeStamp protocol buffer.
// The tag strings define the protocol buffer field numbers.
struct {
    microsec  uint64 "field 1"
    serverIP6 uint64 "field 2"
    process   string "field 3"
}

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