英文:
Implementation of an interface which contains a struct
问题
我对Go语言中的类型集有些困惑。在Go 1.18之后，Go支持在接口中嵌入结构体。例如，下面的代码是合法的Go代码：
type ABCInterface interface {ABC}type ABC struct {A, B, C int}
我的问题是，如何实例化一个满足ABCInterface接口的对象？
我尝试创建ABC的实例，但它不是ABCInterface类型的。
我还定义了一个新的结构体：
type ABCImpl struct {ABC}
但这也不是ABCInterface的实现。
英文:
I am bit confused about how the typesets in go work. Post Go 1.18, go supports embedding structs inside an interface. For instance, this is perfectly valid go code :
type ABCInterface interface {ABC}type ABC struct {A, B, C int}
My question is how do I instantiate an object which satisfies the ABCInterface?
I tried creating instance of ABC but that is not of type ABCInterface.
I also defined a new struct
type ABCImpl struct {ABC}
but this is not an implementation of ABCInterface as well.
答案1
得分: 2
在Go语言中，接口是一组方法签名，用于定义结构体（或类型）必须遵循的行为。当一个结构体实现了接口指定的所有方法时，就称为满足或实现了该接口。
在你的情况下，假设你想要一个实现Sum方法的接口。要实现该接口，你可以按照以下方式添加监听器：
package mainimport "log"// ABCInterface 提供了一个包含 Sum 方法的类型的蓝图。type ABCInterface interface {Sum() int}// ABC 是表示 A、B 和 C 值的类型。type ABC struct {A, B, C int}// ABCImpl 是继承 ABC 字段并实现 ABCInterface 的类型。type ABCImpl struct {ABC}// Sum 计算 A、B 和 C 的和并返回结果。func (a ABCImpl) Sum() int {return a.C + a.A + a.B}func main() {// 创建 ABCImpl 的实例。trialValue := ABCImpl{ABC: ABC{A: 1,B: 2,C: 3,},}// 调用 trialValue 实例的 Sum 方法并打印结果。log.Println(trialValue.Sum())}
你也可以省略 ABC 结构体，直接使用以下方式定义 ABCImpl：
type ABCImpl struct {A, B, C int}
希望对你有帮助！
英文:
In Go, an interface is a set of method signatures that define the behavior that a struct (or type) must adhere to. When a struct implements all the methods specified by an interface, it is said to satisfy or implement that interface.
In your case, let's consider that you want an interface that implements a Sum method. To implement the interface, you'll add the listener as follows:
package mainimport "log"// ABCInterface provides a blueprint for types that include the Sum method.type ABCInterface interface {Sum() int}// ABC is a type that represents values of A, B, and C.type ABC struct {A, B, C int}// ABCImpl is a type that inherits fields from ABC and implements ABCInterface.type ABCImpl struct {ABC}//You could eliminate the `ABC` struct and simply usetype ABCImpl struct {A,B,C int}// Sum calculates the sum of A, B, and C and returns the result.func (a ABCImpl) Sum() int {return a.C + a.A + a.B}func main() {// Create an instance of ABCImpl.trialValue := ABCImpl{ABC: ABC{A: 1,B: 2,C: 3,},}// Call the Sum method on the trialValue instance and print the result.log.Println(trialValue.Sum())}
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