How to combine multiple interfaces in golang

Interfaces can be combined by creating an aggregate type that contains multiple interfaces. This type is defined as a structure containing all interfaces. Then, provide method implementations for each interface so that the aggregate type implements these interfaces. Aggregate types can now be used like normal interfaces, accessing the behavior of multiple interfaces.

How to combine multiple interfaces in Go

The Go language allows multiple interface implementations, allowing us to create more Flexible and extensible types. Composing multiple interfaces involves creating an aggregate type that contains all the interfaces to be composed.

Create an aggregate type

First, we need to create a structure to accommodate the interfaces to be combined. For example:

<code class="go">type Combo struct {
    Interface1 interface{ DoSomething() }
    Interface2 interface{ DoSomethingElse() }
}</code>

This structure defines an aggregate type with two interfaces: Interface1 and Interface2.

Implementing the interface

To make the aggregate type implement these interfaces, we need to provide a method implementation for each interface. For the Combo type we can add the following method:

<code class="go">func (c Combo) DoSomething() {
    c.Interface1.DoSomething()
}

func (c Combo) DoSomethingElse() {
    c.Interface2.DoSomethingElse()
}</code>

Using Combo Types

Now we can use the aggregate type just like a normal interface:

<code class="go">func main() {
    c := Combo{
        Interface1: new(Type1),
        Interface2: new(Type2),
    }
    
    c.DoSomething()
    c.DoSomethingElse()
}</code>

In the main function, we create an instance of the Combo type, which contains types that implement Interface1 and Interface2. We can then call the DoSomething and DoSomethingElse methods to access the behavior of both interfaces.

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