dongye9820 2013-07-06 17:39
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来自自定义结构的Golang参考列表

I have the following block of code:

package main

import (
    "fmt"
    "container/list"
)

type Foo struct {
    foo list  //want a reference to the list implementation   
             //supplied by the language
}


func main() {
   //empty  

}

When compiling I receive the following message:

use of package list not in selector

My question is, how do I reference list within a struct? Or is this not the proper idiom in Go for wrapping structures. (Composition)

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  • doushi7761 2013-07-06 18:01
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    I can see two problems:

    1. importing the fmt package without using it. In Go unused imports result in compile-time errors;
    2. foo is not declared correctly: list is a package name not a type; you want to use a type from the container/list package.

    Corrected code:

    package main
    
    import (
        "container/list"
    )
    
    type Foo struct {
        // list.List represents a doubly linked list.
        // The zero value for list.List is an empty list ready to use.
        foo list.List
    }
    
    func main() {}
    

    You can execute the above code in the Go Playground.
    You should also consider reading the official documentation of the container/list package.

    Depending on what you're trying to do, you might also want to know that Go allows you to embed types within a struct or interface. Read more in the Effective Go guide and decide wether or not this makes sense for your particular case.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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