如何从函数访问结构的实例字段？

Question

Assuming, that I have a Graph struct, like so:

type Graph struct {
    nodes   []int
    adjList map[int][]int
}

// some methods on the struct


// constructor
func New() *Graph {
    g := new(Graph)
    g.adjList = make(map[int][]int)
    return g
}

Now, I create a new instance of that struct, with: aGraph := New().

How do I access the fields of this particular instance of the Graph struct (aGraph)? In other words, how do I access aGraph's version of the nodes array, (from within another top-level function for example)?

Any help is extremely appreciated!

Answer 1

Here is one example:

package main

import (
    "fmt"
)

// example struct
type Graph struct {
    nodes   []int
    adjList map[int][]int
}

func New() *Graph {
    g := new(Graph)
    g.adjList = make(map[int][]int)
    return g
}

func main() {

    aGraph := New()
    aGraph.nodes = []int {1,2,3}

    aGraph.adjList[0] = []int{1990,1991,1992}
    aGraph.adjList[1] = []int{1890,1891,1892}
    aGraph.adjList[2] = []int{1890,1891,1892}

    fmt.Println(aGraph)
}

Output:&{[1 2 3 4 5] map[0:[1990 1991 1992] 1:[1890 1891 1892] 2:[1790 1791 1792]]}