func MapBucketType(t *types.Type) *types.Type { // 检查 t.MapType().Bucket 是否已经存在,如果存在则直接返回 if t.MapType().Bucket != nil { return t.MapType().Bucket } // 获取键值对的类型 keytype := t.Key() elemtype := t.Elem() // 计算键值对的大小 types.CalcSize(keytype) ...
funcmakemap(t*maptype,hint int,h*hmap)*hmap{mem,overflow:=math.MulUintptr(uintptr(hint),t.bucket.size)ifoverflow||mem>maxAlloc{hint=0}// initialize Hmapifh==nil{h=new(hmap)}h.hash0=fastrand()// Find the size parameter B which will hold the requested # of elements.// For hint...
makemap_small:当map编译期确定初始长度不大于8,只创建hmap,不初始化buckets。 makemap64:当make函数传递的长度参数类型是int64时候,调用该函数,底层仍然是复用makemap。 makemap:初始化hash0加入随机性,计算对数B,并初始化buckets。 makemap_small源码 // makemap_small implements Go map creation for make(map[...
在上述实际场景中遇到的 “concurrent map writes” 异常就是通过 runtime.fatal 抛出来的,具体源码(runtime/map.go): // Like mapaccess, but allocates a slot for the key if it is not present in the map. funcmapassign(t *maptype, h *hmap, key unsafe.Pointer)unsafe.Pointer{ ifh ==nil{...
onQuitfunc(err error)connections sync.Map// key=fd, value=connection}// Run this server.func(s*server)Run()(err error){s.operator=FDOperator{FD:s.ln.Fd(),OnRead:s.OnRead,OnHup:s.OnHup,}// 从pollmanager中选择出来一个epoll,来管理server fd,也就是设置mainReactors.operator.poll=pollman...
data :=map[string]string{"n1":"武沛齐","n2":"alex"} delete(data,"n2") 修改 data :=map[string]string{"n1":"武沛齐","n2":"alex"} data["n1"] ="eric" 查看 data :=map[string]string{"n1":"武沛齐","n2":"alex"} forkey,value :=rangedata{ ...
(h) Map 类型 2.4、数字类型 整形: 其他数字类型: 浮点型和复数: #1、字符bytevara1byte='0'vara2rune='中'fmt.Printf("%d,%T\n", a1, a1)//48,uint8 字符'0'对应的ASCII为48fmt.Printf("%d,%T\n", a2, a2)//20013,int32vara3string="a"//string "a"包含a和'\0',只是print的时候只会...
// A bucket for a Go map. type bmap struct { // tophash generally contains the top byte of the hash value // for each key in this bucket. If tophash[0] < minTopHash, // tophash[0] is a bucket evacuation state instead.
In the above code, we have a map with the name m which contains some strings as keys and some integer values are the value of those keys. Later, we make use of the delete() function to get rid of the key named "deepak" from the map and then we again print the contents of the ...
Object), Uses: make(map[*ast.Ident]types.Object), } _, err := conf.Check("hello", fset, files, info) if err != nil { return err // type error } for id, obj := range info.Defs { fmt.Printf("%s: %q defines %v\n", fset.Position(id.Pos()), id.Name, obj) } for id...