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package semver
// Collection is a collection of Version instances and implements the sort
// interface. See the sort package for more details.
type Collection []*Version
// Len returns the length of a collection. The number of Version instances
// on the slice.
func (c Collection) Len() int {
return len(c)
// Less is needed for the sort interface to compare two Version objects on the
// slice. If checks if one is less than the other.
func (c Collection) Less(i, j int) bool {
return c[i].LessThan(c[j])
// Swap is needed for the sort interface to replace the Version objects
// at two different positions in the slice.
func (c Collection) Swap(i, j int) {
c[i], c[j] = c[j], c[i]
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