A Tour of Go Making slices

转载于 2014-10-27 01:13:00 发布 · 75 阅读

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原文链接：http://www.cnblogs.com/ghgyj/p/4053320.html

本文深入解析Go语言中make函数的用法及其如何创建和操作切片，详细介绍了切片的创建、长度、容量的概念，并通过实例展示了如何使用make函数灵活地管理切片。

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Slices are created with the make function. It works by allocating a zeroed array and returning a slice that refers to that array:

a := make([]int, 5)  // len(a)=5

To specify a capacity, pass a third argument to make:

b := make([]int, 0, 5) // len(b)=0, cap(b)=5

b = b[:cap(b)] // len(b)=5, cap(b)=5
b = b[1:]      // len(b)=4, cap(b)=4

package main 

import "fmt"

func main() {
    a := make([]int, 5)
    printSlice("a", a)
    b := make([]int, 0, 5)
    printSlice("b", b)
    c := b[:2]
    printSlice("c", c)
    d := c[2:5]
    printSlice("d", d)
}

func printSlice(s string, x []int) {
    fmt.Printf("%s len=%d cap=%d %v\n",
        s, len(x), cap(x), x)
}