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65 lines
1.5 KiB
Go
65 lines
1.5 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 bounded
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import (
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O "github.com/IBM/fp-go/ord"
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)
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type Bounded[T any] interface {
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O.Ord[T]
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Top() T
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Bottom() T
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}
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type bounded[T any] struct {
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c func(x, y T) int
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e func(x, y T) bool
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t T
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b T
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}
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func (self bounded[T]) Equals(x, y T) bool {
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return self.e(x, y)
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}
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func (self bounded[T]) Compare(x, y T) int {
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return self.c(x, y)
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}
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func (self bounded[T]) Top() T {
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return self.t
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}
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func (self bounded[T]) Bottom() T {
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return self.b
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}
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// MakeBounded creates an instance of a bounded type
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func MakeBounded[T any](o O.Ord[T], t, b T) Bounded[T] {
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return bounded[T]{c: o.Compare, e: o.Equals, t: t, b: b}
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}
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// Clamp returns a function that clamps against the bounds defined in the bounded type
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func Clamp[T any](b Bounded[T]) func(T) T {
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return O.Clamp[T](b)(b.Bottom(), b.Top())
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}
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// Reverse reverses the ordering and swaps the bounds
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func Reverse[T any](b Bounded[T]) Bounded[T] {
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return MakeBounded(O.Reverse[T](b), b.Bottom(), b.Top())
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}
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