How to Implement Interfaces with Identical Method Signatures from Separate Packages in Go?

Implementing Interfaces with Identical Method Signatures from Separate Packages

In Go, it's not feasible to implement two different interfaces with the same method signature in different packages. Typically, each interface type expects a specific implementation, ensuring type safety.

However, if an object is required to satisfy multiple interfaces with identically named methods, it can be challenging to implement a consistent logic for all interfaces.

Case Example:

Consider two packages A and B containing interfaces Doer with identical method signatures:

package A
type Doer interface {
    Do() string
}

package B
type Doer interface {
    Do() string
}

Issue:

In package main, a single object C is designed to implement both A.Doer and B.Doer:

package main

func (c C) Do() string {
    return "C now implements both A and B"
}

This implementation, however, will cause a bug when calling B.FuncB(c) because the Do method implemented in C is intended only for A.Doer.

Solution:

Using Go's embedding feature, separate wrapper types can be created:

• DoerA: Embeds C and implements A.Do().
• DoerB: Embeds C and implements B.Do().

By passing the appropriate wrapper type as an argument to A.FuncA and B.FuncB, the desired logic for each interface can be maintained.

Additional Notes:

• In some cases, using a dedicated implementation type may be necessary to satisfy specific interface requirements without incurring potential type clashes.
• When dealing with complex inheritance scenarios involving multiple interfaces with overlapping method signatures, it's crucial to carefully consider the logic and ensure consistency across integrations.

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