英文:
golang custom struct undefined, can't import correctly
问题
我有2个兄弟文件：main和test_two。每个文件中分别有main.go和test_two.go文件。其中一个文件中有一个自定义结构体，而另一个文件中我想要运行一个以该结构体作为参数的函数。我得到了错误信息"undefined: Struct"。
main.go文件内容如下：
package main
import "github.com/user/test_two"
type Struct struct {
Fn string
Ln string
Email string
}
func main() {
foo := new(Struct)
foo.Fn = "foo"
foo.Ln = "bar"
foo.Email = "foo@bar.com"
test_two.Fn(foo)
}
test_two.go文件内容如下：
package test_two
import (
"fmt"
)
func Fn(arg *Struct) {
fmt.Println(arg.Fn)
}
英文:
I've got 2 sibling files: main and test_two. In each is the file main.go and test_two.go respectively. In one I've got a custom struct and in the other I want to run a function with that struct as a param. I'm getting the error "undefined: Struct".
package main
import "github.com/user/test_two"
type Struct struct {
Fn string
Ln string
Email string
}
func main() {
foo := new(Struct)
foo.Fn = "foo"
foo.Ln = "bar"
foo.Email = "foo@bar.com"
test_two.Fn(foo)
test_two.go:
package test_two
import (
"fmt"
)
func Fn(arg *Struct) {
fmt.Println(arg.Fn)
}
答案1
得分: 21
一些生活准则：
- 不要在主函数中定义类型（通常情况下）
- 不要尝试在其他包中导入主函数
- 不要尝试双向导入（导入循环）
- 总是从低级别导入到高级别（例如从 mypkg 导入到 main）
- 所有文件夹都是包，将相关的数据/函数放在其中，并给它们起一个好名字
你可能想要像这样组织代码：
app/main.go
app/mypkg/mypkg.go
main.go 的内容如下：
// Package main 是你的应用程序的入口点（main.go）
package main
import (
"stackoverflow/packages/mypkg"
)
func main() {
foo := mypkg.Struct{
Fn: "foo",
Ln: "foo",
Email: "foo@bar.com",
}
mypkg.Fn(foo)
}
mypkg.go 的内容如下：
package mypkg
import (
"fmt"
)
type Struct struct {
Fn string
Ln string
Email string
}
func Fn(s Struct) {
fmt.Printf("函数调用参数：%v\n", s)
}
英文:
Some rules to live by:
- Don't define types in main (usually)
- Don't try to import main in other packages
- Don't try to import both ways (import cycle)
- Always import from a lower level into a higher one (so mypkg into main)
- All folders are packages, put related data/functions in them and name them well
You probably want something like this:
app/main.go
app/mypkg/mypkg.go
with contents for main.go:
// Package main is your app entry point in main.go
package main
import (
"stackoverflow/packages/mypkg"
)
func main() {
foo := mypkg.Struct{
Fn: "foo",
Ln: "foo",
Email: "foo@bar.com",
}
mypkg.Fn(foo)
}
Contents for mypkg.go:
package mypkg
import (
"fmt"
)
type Struct struct {
Fn string
Ln string
Email string
}
func Fn(s Struct) {
fmt.Printf("func called with %v\n", s)
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
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