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Go by Example - Methods

翻译自 https://gobyexample.com/

Go by Example

Go is an open source programming language designed for building simple, fast, and reliable software.

Go by Example is a hands-on introduction to Go using annotated example programs. Check out the first example or browse the full list below.

Go by Example: Methods

golang支持在结构体上定义方法。

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package main
import "fmt"
type rect struct {
width, height int
}
// 在rect的引用类型上定义一个area方法
func (r *rect) area() int {
return 2*r.width * 2*r.height
}
// 也可以将方法定义在结构体上
funv (r rect) perim() int {
return 2*r.width + 2*r.height
}
func main() {
r := rect{width: 10, height: 5}
// 直接使用结构体来调用两个方法
fmt.Println("area: ", r.area())
fmt.Println("perim: ", r.perim())
rp := &r
// golang会在方法调用时在结构体和引用之间自动转换,你可能希望使用指针来避免方法调用时的值传递,并且可以在方法内修改传入的结构体的值
fmt.Println("area: ", rp.area())
fmt.Println("perim: ", rp.perim())
}
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$ go run methods.go
area: 50
perim: 30
area: 50
perim: 30

原文链接:Go by Example: Methods