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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 option
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import (
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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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)
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// Constructs an equal predicate for an `Option`
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func Eq[A any](a EQ.Eq[A]) EQ.Eq[Option[A]] {
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// some convenient shortcuts
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fld := Fold(
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F.Constant(Fold(F.ConstTrue, F.Constant1[A](false))),
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F.Flow2(F.Curry2(a.Equals), F.Bind1st(Fold[A, bool], F.ConstFalse)),
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)
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// convert to an equals predicate
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return EQ.FromEquals(F.Uncurry2(fld))
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}
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// FromStrictEquals constructs an `Eq` from the canonical comparison function
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func FromStrictEquals[A comparable]() EQ.Eq[Option[A]] {
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return Eq(EQ.FromStrictEquals[A]())
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}
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