// used, by convention, to distinguish byte values from 8-bit unsigned // integer values. type byte = uint8 在go 的源码中src/runtime/slice.go,slice 的定义如下: type slice struct { array unsafe.Pointer len int cap int } array 是底层数组的指针,len 表示长度,cap 表示容量。对于[]byte来...
package main import ( "bytes" "errors" "fmt" "math" ) // ByteSliceToInt converts a byte slice to an integer. // It assumes the byte slice is in big-endian order and represents a signed integer. func ByteSliceToInt(b []byte) (int, error) { if len(b) == 0 { return 0, err...
// Golang program to create a slice// from an integer arraypackagemainimport"fmt"funcmain() {//Create an integer arrayarr:=[10]int{10,20,30,40,50,60,70,80,90,100}//create slice of from index 2 till index 4(5-1).intSlice:=arr[2:5] fmt.Println("Integer slice: ", intSlice...
func slicestringcopy(to []byte, fm string) int { if len(fm) == 0 || len(to) == 0 { return 0 } // copy的长度取决与string和[]byte的长度最小值 n := len(fm) if len(to) < n { n = len(to) } // 如果开启了竞态检测 -race if raceenabled { callerpc := getcallerpc() p...
// Golang program to sort slice of integer// in ascending orderpackagemainimport"fmt"import"sort"funcmain() { slice:=[]int{70,20,30,60,50,60,10,80,90,100} sort.Ints(slice) fmt.Println("Sorted slice: ")for_, ele:=rangeslice { ...
SliceHeader)(unsafe.Pointer(&b)) // 先引用,防止原有string gc pbytes.Data = stringHeader.Data pbytes.Len = stringHeader.Len pbytes.Cap = stringHeader.Len return b } 1.20中,官方提供如下三个函数包装下底层实现 func String(ptr *byte, len IntegerType) string:根据数据指针和字符长度构造一个...
源码解释如下//rune is an alias for int32 and is equivalent to int32 in all ways. It isused, by convention, to distinguish character valuesfrominteger values. type rune= int32 fmt.Println("a ->", rune('a')) fmt.Println("A ->", rune('A')) ...
Golang中与时间有关的操作,主要涉及到 time 包,核心数据结构是time.Time,如下: typeTimestruct { walluint64 extint64 loc*Location } 1、获取时间相关函数 1.1 获取当前时间 // 返回当前时间,注意此时返回的是 time.Time 类型 now :=time.Now()
Go语言中的字符串类型是不可变的,即一旦创建就不能被修改。字符串在内存中使用字节数组(byte slice)来存储UTF-8编码字符序列。 字符串类型提供了一些常用的方法,例如: len(s):获取字符串s的长度; s[i]:获取字符串s中索引为i的字符; s + t:将字符串s和t拼接成一个新的字符串; ...
// Integer is a constraint that permits any integer type.// If future releases of Go add new predeclared integer types,// this constraint will be modified to include them.type Integer interface {Signed | Unsigned} 1.3类型推导 引入类型推导，可以简化我们代码工作，目前支持2种类型推导功能。通过...