//第一部分,前置检查 //参数为slice类型,原silce,目的扩容大小 func growslice(et *_type, old slice, cap int) slice { //竞态检查 if raceenabled { callerpc := getcallerpc() racereadrangepc(old.array, uintptr(old.len*int(et.size)), callerpc, funcPC(growslice)) } if msanenabled { ms...
lenintcapint}//growslice handles slice growth during append.//It is passed the slice element type, the old slice, and the desired new minimum capacity,//and it returns a new slice with at least that capacity, with the old data//copied into it.//The new slice's length is set to the...
// growslice allocates new backing store for a slice./// arguments:/// oldPtr = pointer to the slice's backing array// newLen = new length (= oldLen + num)// oldCap = original slice's capacity.// num = number of elements being added// et = element type/// return ...
TypeOf(slice).Elem() != reflect.TypeOf(value) { return nil, errors.New("param is invalid") } dst := reflect.MakeSlice(reflect.TypeOf(slice), 0, 0) // add the element to the end of slice if index == v.Len() { dst = reflect.AppendSlice(dst, v.Slice(0, v.Len())) dst ...
它会根据value的类型返回不同的Field,如果value没有实现zapcore.ObjectMarshaler、zapcore.ArrayMarshaler,也不是基础类型,则走的是默认的Reflect(key, val);AddTo方法根据Field的类型做不同处理,如果是ReflectType类型,则执行的是enc.AddReflected(f.Key, f.Interface);jsonEncoder的AddReflected方法使用golang内置的...
// oldCap = original slice's capacity. // num = number of elements being added // et = element type // // return values: // // newPtr = pointer to the new backing store // newLen = same value as the argument // newCap = capacity of the new backing store ...
golang 的 map 存放数据的容器叫做桶(bucket),每个桶中有 8 个槽位(cell),每个槽位存放一个元素(element),当你初始化一个长度为 16 的 map时,golang 会初始化有 3 个桶 (3*6.5>16)的map,3个桶一共可以放 24 个元素. 这3 * 6.5 是怎么来的,下方源码有解释 map根据键的 hash 值,来选择key应...
// Slice contains Type fields specific to slice types.type Slice struct { Elem *Type // element type} 1. 编译时:字面量初始化 当我们使用字面量 []int{1, 2, 3} 创建新的切片时,会创建一个array数组([3]int{1,2,3})存储于静态区中。同时会创建一个变量。
golang 的引用类型包括 slice、map、channel、function、pointer 等. 它们在进行赋值时拷贝的是指针值,但拷贝后指针指向的地址是相同的. 本文将简析 slice、map、channel 这三个引用类型. 从它们的底层实现上,探究在进行参数传递时的变量拷贝情况. golang 的切片 slice ...
a[3]=42// set elementsi := a[3]// read elements// declare and initializevar a =[2]int{1,2}a :=[2]int{1,2}//shorthanda :=[...]int{1,2}// elipsis -> Compiler figures out array length 切片 var a []int// declare a slice - similar to an array, but length is ...