在Go语言的bytes包中找不到NewBuffer([]bytes,int,int64)方法。

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英文:

NewBuffer([]bytes,int,int64) method not found in go lang bytes package

问题

我是你的中文翻译助手,以下是翻译好的内容:

我是Go语言的新手。我正在尝试理解ioutil中的ReadAll(r Reader, capacity int64)方法内部发生了什么。在这个方法内部,有一行代码:

buf := bytes.NewBuffer(make([]byte, 0, capacity))

但是问题是,在bytes包中只有一个参数的NewBuffer方法,如下所示:

func NewBuffer(buf []byte) *Buffer

我一遍又一遍地搜索bytes包的文档,但找不到带有3个参数的NewBuffer方法。

那么实际上,NewBuffer(make([]byte, int, int64))方法是从哪里调用的呢?

英文:

I'm new in go language. I'm trying to understand what's happening inside ioutil.ReadAll(r Reader, capacity int64) method. Inside this method there is a line like:

buf := bytes.NewBuffer(make([]byte, 0, capacity))

But the problem is inside bytes package there is a NewBuffer method with only parameter like:

func NewBuffer(buf []byte) *Buffer

I searched bytes package documentation again and again but can't find NewBuffer method with 3 parameter.

So actually from where NewBuffer(make([]byte, int, int64)) method calling?

答案1

得分: 4

make([]byte, 0, capacity) 返回一个新的字节切片([]byte),其长度为0,容量为capacity

换句话说,将其分成多行可能有助于你理解:

capacity := 100 // 或其他值
var myBytes []byte = make([]byte, 0, capacity)
buf := bytes.NewBuffer(myBytes)
英文:

make([]byte, 0, capacity) returns a new byte slice ([]byte) initialized to length 0 and capacity capacity.

In other words, it might help you to see it on multiple lines:

capacity := 100 // or whatever
var myBytes []byte = make([]byte, 0, capacity)
buf := bytes.NewBuffer(myBytes)

答案2

得分: 2

你忽略了一个事实,那就是你正在使用一个参数调用bytes.NewBuffer()函数,而这个参数恰好是一个方法调用——make([]byte, 0, capacity),它返回一个字节切片。

英文:

Youre missing the fact that you're calling the bytes.NewBuffer() function with a single parameter, which happens to be a method call - make([]byte, 0, capacity) - which returns an byte slice.

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  • 本文由 发表于 2016年3月13日 04:29:51
  • 转载请务必保留本文链接:https://go.coder-hub.com/35962922.html
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