Removed At/Set, added Reset

deque.go

@@ -141,37 +141,6 @@ func (q *Deque) Back() int {
 	return q.buf[q.prev(q.tail)]
 }
 
-// At returns the element at index i in the queue without removing the element
-// from the queue.  This method accepts only non-negative index values.  At(0)
-// refers to the first element and is the same as Front().  At(Len()-1) refers
-// to the last element and is the same as Back().  If the index is invalid, the
-// call panics.
-//
-// The purpose of At is to allow Deque to serve as a more general purpose
-// circular buffer, where items are only added to and removed from the ends of
-// the deque, but may be read from any place within the deque.  Consider the
-// case of a fixed-size circular log buffer: A new entry is pushed onto one end
-// and when full the oldest is popped from the other end.  All the log entries
-// in the buffer must be readable without altering the buffer contents.
-func (q *Deque) At(i int) int {
-	if i < 0 || i >= q.count {
-		panic("deque: At() called with index out of range")
-	}
-	// bitwise modulus
-	return q.buf[(q.head+i)&(len(q.buf)-1)]
-}
-
-// Set puts the element at index i in the queue. Set shares the same purpose
-// than At() but perform the opposite operation. The index i is the same
-// index defined by At(). If the index is invalid, the call panics.
-func (q *Deque) Set(i int, elem int) {
-	if i < 0 || i >= q.count {
-		panic("deque: Set() called with index out of range")
-	}
-	// bitwise modulus
-	q.buf[(q.head+i)&(len(q.buf)-1)] = elem
-}
-
 // Clear removes all elements from the queue, but retains the current capacity.
 // This is useful when repeatedly reusing the queue at high frequency to avoid
 // GC during reuse.  The queue will not be resized smaller as long as items are
@@ -188,6 +157,13 @@ func (q *Deque) Clear() {
 	q.count = 0
 }
 
+// Reset sets properties to empty, but does not rewrite the buffer
+func (q *Deque) Reset() {
+	q.head = 0
+	q.tail = 0
+	q.count = 0
+}
+
 // Rotate rotates the deque n steps front-to-back.  If n is negative, rotates
 // back-to-front.  Having Deque provide Rotate() avoids resizing that could
 // happen if implementing rotation using only Pop and Push methods.