rob1.go

     1  // run
     2  
     3  // Copyright 2009 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Test general operation using a list implementation.
     8  
     9  package main
    10  
    11  type Item interface {
    12  	Print() string
    13  }
    14  
    15  type ListItem struct {
    16  	item Item
    17  	next *ListItem
    18  }
    19  
    20  type List struct {
    21  	head *ListItem
    22  }
    23  
    24  func (list *List) Init() {
    25  	list.head = nil
    26  }
    27  
    28  func (list *List) Insert(i Item) {
    29  	item := new(ListItem)
    30  	item.item = i
    31  	item.next = list.head
    32  	list.head = item
    33  }
    34  
    35  func (list *List) Print() string {
    36  	r := ""
    37  	i := list.head
    38  	for i != nil {
    39  		r += i.item.Print()
    40  		i = i.next
    41  	}
    42  	return r
    43  }
    44  
    45  // Something to put in a list
    46  type Integer struct {
    47  	val int
    48  }
    49  
    50  func (this *Integer) Init(i int) *Integer {
    51  	this.val = i
    52  	return this
    53  }
    54  
    55  func (this *Integer) Print() string {
    56  	return string(this.val + '0')
    57  }
    58  
    59  func main() {
    60  	list := new(List)
    61  	list.Init()
    62  	for i := 0; i < 10; i = i + 1 {
    63  		integer := new(Integer)
    64  		integer.Init(i)
    65  		list.Insert(integer)
    66  	}
    67  
    68  	r := list.Print()
    69  	if r != "9876543210" {
    70  		panic(r)
    71  	}
    72  }
    73
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