Can Go Overload Methods with Different Argument Types?

Overloading Methods with Different Types in Go

In Go, it is possible to define methods with the same name but different receiver types. For example, the following code works fine:

type A struct {
    Name string
}

type B struct {
    Name string
}

func (a *A) Print() {
    fmt.Println(a.Name)
}

func (b *B) Print() {
    fmt.Println(b.Name)
}

func main() {
    a := &A{"A"}
    b := &B{"B"}

    a.Print()
    b.Print()
}

This code prints the desired output:

A
B

However, if we change the method signature to move the receiver to the arguments of the method, we get a compile error:

func Print(a *A) {
    fmt.Println(a.Name)
}

func Print(b *B) {
    fmt.Println(b.Name)
}

func main() {
    a := &A{"A"}
    b := &B{"B"}

    Print(a)
    Print(b)
}

The compile error is:

./test.go:22: Print redeclared in this block
    previous declaration at ./test.go:18
./test.go:40: cannot use a (type *A) as type *B in function argument

The reason for this error is that Go does not support overloading of user-defined functions on their argument types. This means that we cannot have two functions with the same name but different argument types.

Instead, we can use different function names or use methods to "overload" on only one parameter (the receiver).

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