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59 lines
1.3 KiB
Go
59 lines
1.3 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 monoid
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import (
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S "github.com/IBM/fp-go/semigroup"
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)
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func AlternativeMonoid[A, HKTA, HKTFA any, LAZYHKTA ~func() HKTA](
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fof func(A) HKTA,
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fmap func(HKTA, func(A) func(A) A) HKTFA,
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fap func(HKTFA, HKTA) HKTA,
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falt func(HKTA, LAZYHKTA) HKTA,
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m Monoid[A],
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) Monoid[HKTA] {
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sg := ApplicativeMonoid(fof, fmap, fap, m)
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return MakeMonoid(
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func(first, second HKTA) HKTA {
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snd := func() HKTA { return second }
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return falt(sg.Concat(first, second), func() HKTA {
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return falt(first, snd)
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})
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},
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sg.Empty(),
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)
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}
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func AltMonoid[HKTA any, LAZYHKTA ~func() HKTA](
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fzero LAZYHKTA,
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falt func(HKTA, LAZYHKTA) HKTA,
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) Monoid[HKTA] {
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return MakeMonoid(
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S.AltSemigroup(falt).Concat,
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fzero(),
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)
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}
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