main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"time"
)
func main() {
// single()
// stacked()
findTheMeaning()
}
func findTheMeaningNoDefer() {
start := time.Now()
fmt.Printf("%s starts...\n", "findTheMeaning")
// do some heavy calculation...
time.Sleep(time.Second * 2)
fmt.Printf("%s took %v\n", "findTheMeaning", time.Since(start))
}
func findTheMeaning() {
defer measure("findTheMeaning")()
// do some heavy calculation
time.Sleep(time.Second * 2)
}
func measure(name string) func() {
start := time.Now()
fmt.Printf("%s starts...\n", name)
return func() {
fmt.Printf("%s took %v\n", name, time.Since(start))
}
}
func stacked() {
for count := 1; count <= 5; count++ {
defer fmt.Println(count)
}
fmt.Println("the stacked func returns")
}
func single() {
var count int
// defer func() {
// fmt.Println(count)
// }()
defer fmt.Println(count)
count++
// fmt.Println(count)
// the defer runs here
// fmt.Println(count)
}
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