fix: switch internal implementation of iterator from Tuple2 to Pair

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

option/pair.go

@@ -0,0 +1,30 @@
+// Copyright (c) 2024 IBM Corp.
+// All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package option
+
+import (
+	P "github.com/IBM/fp-go/pair"
+	PG "github.com/IBM/fp-go/pair/generic"
+)
+
+// SequencePair converts a [Pair] of [Option[T]] into an [Option[Pair]].
+func SequencePair[T1, T2 any](t P.Pair[Option[T1], Option[T2]]) Option[P.Pair[T1, T2]] {
+	return PG.SequencePair(
+		Map[T1, func(T2) P.Pair[T1, T2]],
+		Ap[P.Pair[T1, T2], T2],
+		t,
+	)
+}