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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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EQ "github.com/IBM/fp-go/eq"
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G "github.com/IBM/fp-go/internal/eq"
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)
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// Eq implements the equals predicate for values contained in the IO monad
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func Eq[GEA ~func(R) GIOA, GIOA ~func() A, R, A any](e EQ.Eq[A]) func(r R) EQ.Eq[GEA] {
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// comparator for the monad
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eq := G.Eq(
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MonadMap[GEA, func(R) func() func(A) bool, GIOA, func() func(A) bool, R, A, func(A) bool],
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MonadAp[GEA, func(R) func() bool, func(R) func() func(A) bool],
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e,
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)
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// eagerly execute
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return func(ctx R) EQ.Eq[GEA] {
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return EQ.FromEquals(func(l, r GEA) bool {
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return eq(l, r)(ctx)()
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})
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}
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}
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