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// Package stack implements a simple LIFO Stack for generic values
package stack

// Stack contains a generic value
type Stack []interface{}

// NewStack returns a new Stack
func NewStack() Stack {
	return Stack{}
}

// Push generic value into Stack
func (s *Stack) Push(v interface{}) {
	*s = append(*s, v)
}

// Pop generic value from Stack
func (s *Stack) Pop() (v interface{}, ok bool) {
	size := len(*s) - 1
	if ok = size >= 0; ok {
		v, *s = (*s)[size], (*s)[:size]
	}
	return v, ok
}

// Peek returns top value from Stack
func (s *Stack) Peek() interface{} {
	return (*s)[len(*s) - 1]
}

// Depth returns actual size of Stack
func (s *Stack) Depth() int {
	return len(*s)
}

// Swap swapes to top values
func (s *Stack) Swap() {
	size := len(*s)
	if size >= 2 {
		(*s)[size-1], (*s)[size-2] = (*s)[size-2], (*s)[size-1]
	}
}