Golang中的未定义错误

Question

I have the following structure:

/*gotime.go*/
package gotime

type Now struct {
    dnow int
    ynow int
    mnow time.Month
}

And is there a function like:

/*gotime.go*/
func (n Now) DayNow() int {
    n.dnow = time.Now().Day()
    return n.dnow

}

I'm getting the following error when I want to call this package:

/*main.go*/
package main

import (
    "fmt"
    "./gotime"
)

blah := Now
fmt.Println(blah.DayNow())

I get errors:

# command-line-arguments
.\main.go:5: imported and not used: "_/C_/Users/ali/Desktop/test/gotime"
.\main.go:10: undefined: Now

You can look at all of the package on GitHub:

Link for this package

How can I solve this problem?

Answer 1

Since Now is a struct, you need a struct Composite literal to create a value of that type.

Also since it is from another package, you need the Qualified name:

blan := gotime.Now{}

Also since you are modifying it, you should / need to use a pointer receiver:

func (n *Now) DayNow() int {
    n.dnow = time.Now().Day()
    return n.dnow
}