Go 中类型转换和转换的综合指南

var i int = 42

var f float64 = float64(i)  // int to float64

var u uint = uint(i)        // int to uint

var s string = "hello"

var b []byte = []byte(s)   // string to []byte

var s2 string = string(b)  // []byte to string

var r []rune = []rune(s)   // string to []rune

var s3 string = string(r)  // []rune to string

type myint int

var i int = 10

var mi myint = myint(i)   // int to myint

var i2 int = int(mi)      // myint to int

var x int = 42

var p *int = &x     // int to *int (pointer to int)

var y int = *p      // *int to int (dereferencing)

var a interface{} = 42    // int to interface{}

var b int = a.(int)       // interface{} to int (type assertion)

if v, ok := a.(int); ok {

    fmt.println("a is an int:", v)

}

switch v := a.(type) {

case int:

    fmt.println("a is an int:", v)

case string:

    fmt.println("a is a string:", v)

default:

    fmt.println("a is of unknown type")

}

import "unsafe"

var i int = 42

var p *int = &i

var fp *float64 = (*float64)(unsafe.pointer(p))  // *int to *float64

ch := make(chan int)

var sendonlychan chan

<h2>

  7. 结构体和数组转换

</h2>

<p>具有相同布局的结构体或数组之间的转换需要显式转换：<br></p>

<pre class="brush:php;toolbar:false">type point struct {

    x, y int

}

type coord struct {

    x, y int

}

var p point = point{1, 2}

var c coord = coord(p)  // convert point to coord (same field types)

var a []int = []int{1, 2, 3}

var b []int = a[1:]  // convert a slice to another slice of the same type

var x interface{} = nil

var y error = nil

type functype func(int) int

func square(x int) int {

    return x * x

}

var f functype = functype(square)  // convert function to functype

var arr [5]int = [5]int{1, 2, 3, 4, 5}

var sl []int = arr[:]  // Convert array to slice