blob: ed8917d3601739a291952e9c96dfb8781127a847 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// Package stack implements a simple LIFO Stack for generic values
package stack
// Stack contains generic values
type Stack []interface{}
// NewStack returns a new Stack
func NewStack() Stack {
return Stack{}
}
// Push adds value at tail
func (s *Stack) Push(v interface{}) {
*s = append(*s, v)
}
// Insert inserts value at head
func (s *Stack) Insert(v interface{}) {
*s = append(Stack{v}, *s...)
}
// Pop retrieves value from tail
func (s *Stack) Pop() (v interface{}) {
if size := len(*s); size > 0 {
v, *s = (*s)[size-1], (*s)[:size-1]
}
return v
}
// Peek returns top value from Stack
func (s Stack) Peek() interface{} {
return s[len(s)-1]
}
// Swap swapes two top values
func (s Stack) Swap() {
if size := len(s); size >= 2 {
s[size-1], s[size-2] = s[size-2], s[size-1]
}
}
// Depth returns actual size of Stack
func (s Stack) Depth() int {
return len(s)
}
|