xjk112 Go has built-in support for multiple return values. This feature is used often in idiomatic Go, for example to return both result and error values from a function package main import ("fmt") func vals() (int,int) {return3,7} func main() { a, b :=vals() fmt.Println(a) ...
description: I did some research, but can't find a similar issue, so I opened a new one. Sometimes we really want to use the returned values as the input of another function directly without having to use tmp vars. For example: package m...
https://github.com/vlang/v/blob/master/doc/docs.md#returning-multiple-valuesgithub.com/vlang/...
A great feature of Go is that you can return multiple values from a single function. Here’s an alternative implementation that doesn’t suffer from the previous problem. func FindBestSolution(solutions []Solution) (Solution, bool) { var best Solution found := false for _, solution := rang...
·lock: lock count")}//g绑定的m的lock属性自增加一gp.m.locks++// 投机抢占锁 运气好抢到直接返回 不需要进行内核调用v:=atomic.Xchg(key32(&l.key),mutex_locked)ifv==mutex_unlocked{return}// wait为MUTEX_LOCKED还是MUTEX_SLEEPING取决于此互斥对象mutex是否存在线程在休眠// 如果我们曾经将l->key从...
在Go 1.9之前,go语言标准库中并没有实现并发map。在Go 1.9中,引入了sync.Map。新的sync.Map与此concurrent-map有几个关键区别。标准库中的sync.Map是专为append-only场景设计的。因此,如果您想将Map用于一个类似内存数据库,那么使用我们的版本可能会受益。你可以在golang repo上读到更多,这里and这里 ...
// 判断要装的数量是否超出负载因子 func overLoadFactor(count int, B uint8) bool { // 当数量大于8 并且 数量大于 装载因子 时,则扩容 // 这里可以简单理解为当元素数量大于通数量的6.5倍时(每个桶能放8个kv),则会扩容 return count > bucketCnt && uintptr(count) > loadFactorNum*(bucketShift(B...
是否可能具有类似的行为,并带有可选的return map? 例如: package main import "fmt" func Hello() (string, bool) { return "hello", true } func main() { if value, ok := Hello(); ok { fmt.Println(value) } value := Hello() fmt.Println(value) } 无法编译(由于错误multiple-value Hello(...
return m[uint(fnv32(key))%uint(SHARD_COUNT)] } ConcurrentMap 其实就是一个切片,切片的每个元素都是第一种方法中携带了读写锁的 map。 这里面 GetShard 方法就是用来计算每一个 key 应该分配到哪个分片上。 再来看一下 Set 和 Get 操作。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 fu...
=nil{returnerr }forid :=1; id <10; id++ { _, err := tx.Exec("INSERT INTO users(id,name,status,created_at,updated_at) VALUES(?,?,?,?,?)", id,"test"+strconv.Itoa(id),1, time.Now(), time.Now())iferr !=nil{returntx.Rollback() } }returntx.Commit()...