Graph datastructure - visit method as a parameter?

[JOhn_Stuart (Les Way)]

I am implementing a tree. It is defined by the struct “Graph” and the struct “Node”.

Now I want to implement the visit method. Namely I want to write an algorithm that visits every node (very simple) and for each node calls a visitNode() method. This visitNode method will be called for each node.

Now I this visitMethod to be given as a parameter to my visit function. Visit function iterates through each node n, and calls visitMethod(n).

func (g * Graph) visit( Visit func(*Node)) <- is this the way my visit method is supposed to get another method as a parameter ?

[johandalabacka (Johan Dahl)]

@JOhn_Stuart

func (g * Graph) visit( Visit func(*Node))

Yes it is Go Playground - The Go Programming Language

package main

import (
	"fmt"
)

type Node struct {
	value interface{}
}

// A very flat graph :)
type Graph struct {
	children []*Node
}

func (g * Graph) Visit(visit func(*Node)) {
	for _, n := range g.children {
		visit(n)
	}
}

func printNode(n *Node) {
	fmt.Println(n.value)
}	

func main() {
	g := Graph{}
	g.children = []*Node{&Node{value: "I'm a node"}, &Node{value: "I'm a another node"}}
	
	// Anonymous function
	g.Visit(func(n *Node) { fmt.Println(n.value) })
	
	// Named function
	g.Visit(printNode)
}