英文:
Combining or extending interfaces?
问题
我有两个接口：
type Request interface {
Version() string
Method() string
Params() interface{}
Id() interface{}
}
type Responder interface {
NewSuccessResponse() Response
NewErrorResponse() Response
}
我想创建一个RequestResponder接口，将这两个接口合并在一起。这可行吗，还是我必须创建一个包含所有6个函数的第三个接口？
英文:
I have two interfaces:
type Request interface {
Version() string
Method() string
Params() interface{}
Id() interface{}
}
type Responder interface {
NewSuccessResponse() Response
NewErrorResponse() Response
}
I would like to make a RequestResponder interface which combines both of these. Is this possible, or do I have to create a third interface with all 6 functions?
答案1
得分: 5
接口嵌入是允许的，如规范所述：
接口
T可以在方法规范的位置使用一个（可能是限定的）接口类型名E。这被称为在T中嵌入接口E；它将E的所有（导出和非导出）方法添加到接口T中。
这在Go标准库中被广泛应用（一个例子是io.ReadCloser）。
在你的问题中，RequestResponder可以这样构建：
type RequestResponder interface {
Request
Responder
}
英文:
Interface embedding is allowed, as documented in the spec:
> An interface T may use a (possibly qualified) interface type name E in place of a method specification. This is called embedding interface E in T; it adds all (exported and non-exported) methods of E to the interface T.
This is done throughout Go's standard library (one example is io.ReadCloser).
In your question, RequestResponder would be constructed as:
type RequestResponder interface {
Request
Responder
}
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