master > master: code - stacks + queues data structures überarbeitet

code/golang/pkg/data_structures/queues/queues.go

@@ -0,0 +1,81 @@
+package queues
+
+/* ---------------------------------------------------------------- *
+ * IMPORTS
+ * ---------------------------------------------------------------- */
+
+import (
+	"fmt"
+	"strings"
+)
+
+/* ---------------------------------------------------------------- *
+ * GLOBAL VARIABLES/CONSTANTS
+ * ---------------------------------------------------------------- */
+
+//
+
+/* ---------------------------------------------------------------- *
+ * TYPE
+ * ---------------------------------------------------------------- */
+
+type QueueInt struct {
+	values *[]int
+}
+
+/* ---------------------------------------------------------------- *
+ * METHODS stacks
+ * ---------------------------------------------------------------- */
+
+func CREATE() QueueInt {
+	return QueueInt{}
+}
+
+func (S *QueueInt) INIT() {
+	S.values = &[]int{}
+}
+
+func (S QueueInt) Length() int {
+	if S.values == nil {
+		return 0
+	}
+	return len(*S.values)
+}
+
+func (S QueueInt) String() string {
+	if S.EMPTY() {
+		return "-"
+	}
+	values := []string{}
+	n := S.Length()
+	for i := n - 1; i >= 0; i-- {
+		value := (*S.values)[i]
+		values = append(values, fmt.Sprintf("%v", value))
+	}
+	return fmt.Sprintf(strings.Join(values, " -> "))
+}
+
+func (S QueueInt) EMPTY() bool {
+	return S.Length() == 0
+}
+
+func (S *QueueInt) ENQUEUE(x int) {
+	if S.values == nil {
+		panic("Queue not initialised!")
+	}
+	*S.values = append(*S.values, x)
+}
+
+func (S *QueueInt) FRONT() int {
+	if S.EMPTY() {
+		panic("Cannot read from empty queue!")
+	}
+	return (*S.values)[0]
+}
+
+func (S *QueueInt) DEQUEUE() {
+	if S.EMPTY() {
+		panic("Cannot remove from empty queue!")
+	}
+	*S.values = (*S.values)[1:]
+}