Golang byte buffers tricks

shengjuntu · · 884 次点击 · · 开始浏览    
这是一个创建于 的文章,其中的信息可能已经有所发展或是发生改变。

Tricks with []byte buffers

The following tricks are used by fasthttp. Use them in your code too.

  • Standard Go functions accept nil buffers
var (
    // both buffers are uninitialized
    dst []byte
    src []byte
)
dst = append(dst, src...)  // is legal if dst is nil and/or src is nil
copy(dst, src)  // is legal if dst is nil and/or src is nil
(string(src) == "")  // is true if src is nil
(len(src) == 0)  // is true if src is nil
src = src[:0]  // works like a charm with nil src

// this for loop doesn't panic if src is nil
for i, ch := range src {
    doSomething(i, ch)
}

So throw away nil checks for []byte buffers from you code. For example,

srcLen := 0
if src != nil {
    srcLen = len(src)
}

becomes

srcLen := len(src)
  • String may be appended to []byte buffer with append
dst = append(dst, "foobar"...)
  • []byte buffer may be extended to its' capacity.
buf := make([]byte, 100)
a := buf[:10]  // len(a) == 10, cap(a) == 100.
b := a[:100]  // is valid, since cap(a) == 100.
  • All fasthttp functions accept nil []byte buffer
statusCode, body, err := fasthttp.Get(nil, "http://google.com/")
uintBuf := fasthttp.AppendUint(nil, 1234)

有疑问加站长微信联系(非本文作者)

本文来自:开源中国博客

感谢作者:shengjuntu

查看原文:Golang byte buffers tricks

入群交流(和以上内容无关):加入Go大咖交流群,或添加微信:liuxiaoyan-s 备注:入群;或加QQ群:692541889

884 次点击  
加入收藏 微博
0 回复
暂无回复
添加一条新回复 (您需要 登录 后才能回复 没有账号 ?)
  • 请尽量让自己的回复能够对别人有帮助
  • 支持 Markdown 格式, **粗体**、~~删除线~~、`单行代码`
  • 支持 @ 本站用户;支持表情(输入 : 提示),见 Emoji cheat sheet
  • 图片支持拖拽、截图粘贴等方式上传