這些天看aws的golang sdk中結(jié)構(gòu)體中有
_ struct{} `type:"structure"`
不知道 下劃線 _ 是什么意思，注意不是tag
// Please also see https://docs.aws.amazon.com/goto/WebAPI/s3-2006-03-01/MultipartUpload
type MultipartUpload struct {
_ struct{} `type:"structure"`
// Date and time at which the multipart upload was initiated.
Initiated *time.Time `type:"timestamp" timestampFormat:"iso8601"`
// Identifies who initiated the multipart upload.
Initiator *Initiator `type:"structure"`
// Key of the object for which the multipart upload was initiated.
Key *string `min:"1" type:"string"`
Owner *Owner `type:"structure"`
// The class of storage used to store the object.
StorageClass *string `type:"string" enum:"StorageClass"`
// Upload ID that identifies the multipart upload.
UploadId *string `type:"string"`
}
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SMILET
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這個(gè)叫struct tag
Go offers struct tags which are discoverable via reflection. These enjoy a wide range of use in the standard library in the JSON/XML and other encoding packages.
The community welcomed them and has built ORMs, further encodings, flag parsers and much more around them since, especially for these tasks, single-sourcing is beneficial for data structures.
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