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50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
// Copyright (c) 2024 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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ET "github.com/IBM/fp-go/either"
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EQ "github.com/IBM/fp-go/eq"
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F "github.com/IBM/fp-go/function"
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P "github.com/IBM/fp-go/pair"
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G "github.com/IBM/fp-go/readerioeither/generic"
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)
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// Eq implements the equals predicate for values contained in the [StateReaderIOEither] monad
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func Eq[
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SRIOEA ~func(S) RIOEA,
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RIOEA ~func(R) IOEA,
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IOEA ~func() ET.Either[E, P.Pair[A, S]],
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S, R, E, A any](eqr EQ.Eq[RIOEA]) func(S) EQ.Eq[SRIOEA] {
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return func(s S) EQ.Eq[SRIOEA] {
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return EQ.FromEquals(func(l, r SRIOEA) bool {
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return eqr.Equals(l(s), r(s))
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})
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}
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}
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// FromStrictEquals constructs an [EQ.Eq] from the canonical comparison function
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func FromStrictEquals[
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SRIOEA ~func(S) RIOEA,
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RIOEA ~func(R) IOEA,
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IOEA ~func() ET.Either[E, P.Pair[A, S]],
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S, R any, E, A comparable]() func(R) func(S) EQ.Eq[SRIOEA] {
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return F.Flow2(
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G.FromStrictEquals[RIOEA](),
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Eq[SRIOEA, RIOEA, IOEA, S, R, E, A],
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)
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}
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