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37 lines
1.2 KiB
Go
37 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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T "github.com/IBM/fp-go/tuple"
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)
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// Constructs an equal predicate for a [Writer]
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func Eq[GA ~func() T.Tuple2[A, W], W, A any](w EQ.Eq[W], a EQ.Eq[A]) EQ.Eq[GA] {
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return EQ.FromEquals(func(l, r GA) bool {
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ll := l()
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rr := r()
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return a.Equals(ll.F1, rr.F1) && w.Equals(ll.F2, rr.F2)
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})
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}
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// FromStrictEquals constructs an `Eq` from the canonical comparison function
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func FromStrictEquals[GA ~func() T.Tuple2[A, W], W, A comparable]() EQ.Eq[GA] {
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return Eq[GA](EQ.FromStrictEquals[W](), EQ.FromStrictEquals[A]())
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}
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