package main

import "fmt"

// Pass by reference
func print_array(ary []int) {
  for _, v := range ary {
    fmt.Printf("%d\n", v);
  }
}

func main() {
  // Declaring own type.
  type T struct { id int; name string }
  var b T;
  b.id = 1;
  b.name = "foo";

  // Use new to create pointer.
  t := new(T);  // var t *T = new(T);
  t.id = 2;
  t.name = "bar";
  fmt.Printf("%d: %s\n", t.id, t.name);

  // An array is values.
  var ary [10]int;
  for i := 0; i < len(ary); i++ {
    ary[i] = i;
  }
  print_array(&ary);  // pass pointer to get slice.

  // Can use new to create a pointer to an array.
  ary2 := new([10]int);
  for i := 0; i < len(*ary2); i++ {
    (*ary2)[i] = i;
  }
  for _, v := range *ary2 {
    fmt.Printf("%d\n", v);
  }

  // The map is a reference type (so are slice and channel),
  // and built by make.
  m := make(map[string]int);
  m["a"] = 1;
  m["b"] = 2;
  fmt.Printf("%d\n", m["b"]);
}