英文:
How does resp.Body implements the Read function?
问题
我目前正在学习Go语言,并试图理解接口的概念。
我理解的是,任何实现了接口中指定函数的类型都是该接口的一部分。
我的问题是关于Response结构体中的io.ReadCloser类型的Body字段。它是如何实现Read函数的?我已经在文档中搜索过,但没有找到相关信息。
英文:
I'm currently studying Go and trying to understand the concept of Interfaces.
What I understand about it is that whatever type implements the functions specified in the interface is part of it.
My question is about the Body of type io.ReadCloser inside of the Response struct. How does it implement the Read function? I've searched through the documentation and couldn't find it.
答案1
得分: 0
io.ReadCloser
没有实现Read
函数。io.ReadCloser
是一个接口类型,因此它本身不能实现任何方法。然而,如果T
的类型集是I
的子集,则接口T
可以实现另一个接口I
。
io.ReadCloser
接口嵌入了io.Reader
和io.Closer
接口。因此,io.ReadCloser
的方法集是io.Reader
和io.Closer
的方法集的组合。
通过嵌入,io.ReadCloser
的类型集是io.Reader
的类型集和io.Closer
的类型集的交集。换句话说,io.ReadCloser
的类型集是所有实现io.Reader
和io.Closer
接口的类型的集合。
上述也意味着io.ReadCloser
的类型集是io.Reader
的类型集和io.Closer
的类型集的子集。
io.ReadCloser
接口实现io.Reader
,因为:
> 如果类型T满足以下条件,则类型T实现接口I:
>
> - T不是接口,并且是I的类型集的元素;或者
> - T是接口,并且T的类型集是I的类型集的子集。
英文:
io.ReadCloser
does not implement the Read
function. io.ReadCloser
is an interface type, so it by itself cannot implement any methods. However, an interface T
can implement another interface I
if T
's type set is a subset of I
.
The io.ReadCloser
interface embeds the io.Reader
and io.Closer
interfaces. Therefore the method set of io.ReadeCloser
is the combined method set of io.Reader
and io.Closer
.
Thanks to embedding the type set of io.ReadCloser
is the intersection of io.Reader
's and io.Closer
's type sets. In other words the type set of io.ReadCloser
is the set of all types that implement the io.Reader
and io.Closer
interfaces.
The above also means that the type set of io.ReadCloser
is a subset of io.Reader
's type set and io.Closer
's type set.
The io.ReadCloser
interface implements io.Reader
because:
> A type T implements an interface I if
>
> - T is not an interface and is an element of the type set of I; or
> - T is an interface and the type set of T is a subset of the type set of I.
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