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() {
h, _ := time.ParseDuration("4h30m")
// why would you want to create a new type?
// 1- adding new methods to the type
fmt.Println(h.Hours(), "hours")
// 2- make it a distinct type for type-safety
// you can't use the defined type
// with its underlying type directly.
//
// you need to convert one of them.
var m int64 = 2
h *= time.Duration(m)
fmt.Println(h)
// type of `h` and its underlying type are different
fmt.Printf("Type of h: %T\n", h)
fmt.Printf("Type of h's underlying type: %T\n", int64(h))
}
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