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58 lines
1.7 KiB
Go
58 lines
1.7 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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F "github.com/IBM/fp-go/function"
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M "github.com/IBM/fp-go/monoid"
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S "github.com/IBM/fp-go/semigroup"
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)
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// Of converts any function to an [Endomorphism]
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func Of[ENDO ~func(A) A, F ~func(A) A, A any](f F) ENDO {
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return func(a A) A {
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return f(a)
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}
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}
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// Wrap converts any function to an [Endomorphism]
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func Wrap[ENDO ~func(A) A, F ~func(A) A, A any](f F) ENDO {
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return Of[ENDO](f)
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}
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// Unwrap converts any [Endomorphism] to a normal function
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func Unwrap[F ~func(A) A, ENDO ~func(A) A, A any](f ENDO) F {
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return Of[F](f)
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}
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func Identity[ENDO ~func(A) A, A any]() ENDO {
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return Of[ENDO](F.Identity[A])
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}
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func Compose[ENDO ~func(A) A, A any](f1, f2 ENDO) ENDO {
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return Of[ENDO](F.Flow2(f1, f2))
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}
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// Semigroup for the Endomorphism where the `concat` operation is the usual function composition.
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func Semigroup[ENDO ~func(A) A, A any]() S.Semigroup[ENDO] {
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return S.MakeSemigroup(Compose[ENDO])
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}
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// Monoid for the Endomorphism where the `concat` operation is the usual function composition.
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func Monoid[ENDO ~func(A) A, A any]() M.Monoid[ENDO] {
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return M.MakeMonoid(Compose[ENDO], Identity[ENDO]())
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}
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