queue

type Queue interface {
	// push a data into queue
	Push(v interface{})
	// pop first data
	Pop() (interface{}, bool)
	// pop many of data
	PopMany(count int64) ([]interface{}, bool)
	// pop all data
	PopAll() ([]interface{}, bool)
	// peek first data
	Front() (interface{}, bool)
	// peek end data
	End() (interface{}, bool)
	// get length of queue
	Length() int64
	// judge queue's lenght if 0
	IsEmpty() bool
}