How to Use Type Parameters in Go Interface Methods?

Type Parameter in Interface Method: A Comprehensive Guide

In Go generics, a common scenario involves utilizing type parameters in interface methods. However, this approach initially encounters an error indicating that function types cannot include type parameters.

One common solution is to include the type parameter in the interface type itself. By specifying the type parameter within the interface, as seen below, it becomes available for use within the method definitions:

type Iterator[T any] interface {
    ForEachRemaining(action func(T) error) error
    // other methods
}

This allows you to define the method signature as follows:

ForEachRemaining(action func(T) error) error

In this way, the type parameter T can be used within the method body, allowing generic functionality to be implemented effectively.

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