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38 lines
1.2 KiB
Go
38 lines
1.2 KiB
Go
// Copyright (c) 2023 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package generic
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import (
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OP "github.com/IBM/fp-go/optics/optional"
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O "github.com/IBM/fp-go/option"
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RR "github.com/IBM/fp-go/record/generic"
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)
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func setter[M ~map[K]V, K comparable, V any](key K) func(M, V) M {
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return func(dst M, value V) M {
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return RR.UpsertAt[M](key, value)(dst)
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}
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}
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func getter[M ~map[K]V, K comparable, V any](key K) func(M) O.Option[V] {
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return RR.Lookup[M](key)
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}
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// AtKey returns a Optional that gets and sets properties of a map
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func AtKey[M ~map[K]V, K comparable, V any](key K) OP.Optional[M, V] {
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return OP.MakeOptional(getter[M](key), setter[M](key))
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}
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