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Implement PullBack()

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Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
This commit is contained in:
Guillaume J. Charmes 2014-01-22 17:12:28 -08:00
parent 43bcbf06a6
commit 18df387bf8
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GPG key ID: B33E4642CB6E3FF3
1 changed files with 16 additions and 1 deletions
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17
networkdriver/portallocator/ipset.go
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@ -28,9 +28,14 @@ func (s *iPSet) Push(elem string) {
s.Unlock() s.Unlock()
} }
// Pop is an alias to PopFront()
func (s *iPSet) Pop() string {
return s.PopFront()
}
// Pop returns the first elemen from the list and removes it. // Pop returns the first elemen from the list and removes it.
// If the list is empty, it returns an empty string // If the list is empty, it returns an empty string
func (s *iPSet) Pop() string { func (s *iPSet) PopFront() string {
s.RLock() s.RLock()
for i, e := range s.set { for i, e := range s.set {
@ -45,6 +50,16 @@ func (s *iPSet) Pop() string {
return "" return ""
} }
// PullBack retrieve the last element of the list.
// The element is not removed.
// If the list is empty, an empty element is returned.
func (s *iPSet) PullBack() string {
if len(s.set) == 0 {
return ""
}
return s.set[len(s.set)-1]
}
// Exists checks if the given element present in the list. // Exists checks if the given element present in the list.
func (s *iPSet) Exists(elem string) bool { func (s *iPSet) Exists(elem string) bool {
for _, e := range s.set { for _, e := range s.set {