# Compile Time Polymorphism in Go

##### Compile Time Polymorphism in Go

In this tutorial, we will discuss compile time polymorphism in Go language. In compile time polymorphism, the call is resolved during compile time by the compiler. Some of the forms for compile-time polymorphism are

• Method/Function Overloading: More than one method/function exists with the same name but with different signatures or possibly different return types
• Operator Overloading: The Same operator is used for operating on different data types

``````package main

type maths struct{}

func (m *maths) add(a, b int) int {
return a + b
}

func (m *maths) add(a, b, c int) int {
return a + b + c
}

func main() {
m := &maths{}
}``````

Output

``````./prog.go:9:6: method redeclared: maths.add
method(*maths) func(int, int) int
method(*maths) func(int, int, int) int
./prog.go:9:17: (*maths).add redeclared in this block
prog.go:5:6: previous declaration``````

Run in playground

Now the question is there any alternative to do method overloading in GO. This is where the Variadic function in go comes into the picture. See below program

``````package main

import "fmt"

type maths struct{}

func (m *maths) add(numbers ...int) int {
result := 0
for _, num := range numbers {
result += num
}
return result
}

func main() {
m := &maths{}

fmt.Println("Result is : ", m.add(5, 10))
fmt.Println("Result is : ", m.add(10, 20, 30))
}``````

Output

``````Result is :  15
Result is :  60``````

Run in playground

###### Conclusion

Go doesn’t directly support method/function/operator overloading, but variadic function provides a way of achieving the same with increased code complexity.

Compile Time Polymorphism in Go

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