What is the easiest method to create an empty buffer of size n
in Go using bytes.NewBuffer()
?
如何在Go中初始化一个空的字节大小为N的缓冲区?
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1条回答 默认 最新
- dpklt4291 2018-01-19 09:18关注
Adding some additional info here. The quick way to create a new buffer is briefly mentioned at the end of the doc string:
b := new(bytes.Buffer)
or
b := &bytes.Buffer{}
The
Buffer
struct define includes a 64 byte internalbootstrap
field that is initially used for small allocations. Once the default size is exceeded, a byte sliceBuffer.buf
is created and internally maintained.As @leafbebop suggested we can pre-initalize the
buf
field of theBuffer
struct using a new slice.b := bytes.NewBuffer(make([]byte,0,N))
I also found another option to use the
Grow()
method:b := new(bytes.Buffer) b.Grow(n)
Also it's interesting to point out that the internal
buf
slice will grow at a rate ofcap(buf)*2 + n
. This means that if you've written 1MB into a buffer and then add 1 byte, yourcap()
will increase to 2097153 bytes.解决 无用评论 打赏 举报
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