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75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
// This file has been ported over from go 1.21.0 so that we can avoid
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// having to upgrade for basic comparison functions. Copyright notice
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// is preserved:
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package cmp provides types and functions related to comparing
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// ordered values.
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package cmp
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// Ordered is a constraint that permits any ordered type: any type
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// that supports the operators < <= >= >.
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// If future releases of Go add new ordered types,
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// this constraint will be modified to include them.
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//
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// Note that floating-point types may contain NaN ("not-a-number") values.
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// An operator such as == or < will always report false when
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// comparing a NaN value with any other value, NaN or not.
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// See the [Compare] function for a consistent way to compare NaN values.
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type Ordered interface {
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~int | ~int8 | ~int16 | ~int32 | ~int64 |
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~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr |
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~float32 | ~float64 |
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~string
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}
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// Less reports whether x is less than y.
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// For floating-point types, a NaN is considered less than any non-NaN,
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// and -0.0 is not less than (is equal to) 0.0.
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func Less[T Ordered](x, y T) bool {
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return (isNaN(x) && !isNaN(y)) || x < y
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}
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// Compare returns
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//
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// -1 if x is less than y,
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// 0 if x equals y,
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// +1 if x is greater than y.
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//
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// For floating-point types, a NaN is considered less than any non-NaN,
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// a NaN is considered equal to a NaN, and -0.0 is equal to 0.0.
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func Compare[T Ordered](x, y T) int {
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xNaN := isNaN(x)
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yNaN := isNaN(y)
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if xNaN && yNaN {
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return 0
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}
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if xNaN || x < y {
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return -1
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}
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if yNaN || x > y {
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return +1
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}
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return 0
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}
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// isNaN reports whether x is a NaN without requiring the math package.
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// This will always return false if T is not floating-point.
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func isNaN[T Ordered](x T) bool {
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return x != x
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}
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// Or returns the first of its arguments that is not equal to the zero value.
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// If no argument is non-zero, it returns the zero value.
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func Or[T comparable](vals ...T) T {
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var zero T
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for _, val := range vals {
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if val != zero {
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return val
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}
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}
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return zero
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}
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