mirror of
https://github.com/golang/go
synced 2024-09-04 23:44:16 +00:00
![Matthew Dempsky](/assets/img/avatar_default.png)
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
261 lines
5.9 KiB
Go
261 lines
5.9 KiB
Go
// run
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// Copyright 2021 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 main
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import (
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"fmt"
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"math"
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"sort"
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)
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// _Equal reports whether two slices are equal: the same length and all
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// elements equal. All floating point NaNs are considered equal.
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func _SliceEqual[Elem comparable](s1, s2 []Elem) bool {
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if len(s1) != len(s2) {
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return false
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}
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for i, v1 := range s1 {
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v2 := s2[i]
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if v1 != v2 {
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isNaN := func(f Elem) bool { return f != f }
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if !isNaN(v1) || !isNaN(v2) {
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return false
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}
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}
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}
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return true
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}
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// _Keys returns the keys of the map m.
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// The keys will be an indeterminate order.
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func _Keys[K comparable, V any](m map[K]V) []K {
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r := make([]K, 0, len(m))
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for k := range m {
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r = append(r, k)
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}
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return r
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}
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// _Values returns the values of the map m.
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// The values will be in an indeterminate order.
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func _Values[K comparable, V any](m map[K]V) []V {
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r := make([]V, 0, len(m))
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for _, v := range m {
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r = append(r, v)
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}
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return r
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}
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// _Equal reports whether two maps contain the same key/value pairs.
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// _Values are compared using ==.
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func _Equal[K, V comparable](m1, m2 map[K]V) bool {
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if len(m1) != len(m2) {
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return false
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}
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for k, v1 := range m1 {
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if v2, ok := m2[k]; !ok || v1 != v2 {
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return false
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}
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}
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return true
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}
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// _Copy returns a copy of m.
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func _Copy[K comparable, V any](m map[K]V) map[K]V {
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r := make(map[K]V, len(m))
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for k, v := range m {
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r[k] = v
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}
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return r
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}
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// _Add adds all key/value pairs in m2 to m1. _Keys in m2 that are already
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// present in m1 will be overwritten with the value in m2.
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func _Add[K comparable, V any](m1, m2 map[K]V) {
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for k, v := range m2 {
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m1[k] = v
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}
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}
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// _Sub removes all keys in m2 from m1. _Keys in m2 that are not present
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// in m1 are ignored. The values in m2 are ignored.
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func _Sub[K comparable, V any](m1, m2 map[K]V) {
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for k := range m2 {
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delete(m1, k)
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}
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}
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// _Intersect removes all keys from m1 that are not present in m2.
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// _Keys in m2 that are not in m1 are ignored. The values in m2 are ignored.
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func _Intersect[K comparable, V any](m1, m2 map[K]V) {
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for k := range m1 {
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if _, ok := m2[k]; !ok {
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delete(m1, k)
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}
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}
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}
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// _Filter deletes any key/value pairs from m for which f returns false.
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func _Filter[K comparable, V any](m map[K]V, f func(K, V) bool) {
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for k, v := range m {
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if !f(k, v) {
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delete(m, k)
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}
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}
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}
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// _TransformValues applies f to each value in m. The keys remain unchanged.
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func _TransformValues[K comparable, V any](m map[K]V, f func(V) V) {
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for k, v := range m {
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m[k] = f(v)
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}
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}
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var m1 = map[int]int{1: 2, 2: 4, 4: 8, 8: 16}
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var m2 = map[int]string{1: "2", 2: "4", 4: "8", 8: "16"}
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func TestKeys() {
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want := []int{1, 2, 4, 8}
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got1 := _Keys(m1)
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sort.Ints(got1)
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if !_SliceEqual(got1, want) {
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panic(fmt.Sprintf("_Keys(%v) = %v, want %v", m1, got1, want))
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}
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got2 := _Keys(m2)
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sort.Ints(got2)
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if !_SliceEqual(got2, want) {
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panic(fmt.Sprintf("_Keys(%v) = %v, want %v", m2, got2, want))
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}
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}
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func TestValues() {
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got1 := _Values(m1)
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want1 := []int{2, 4, 8, 16}
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sort.Ints(got1)
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if !_SliceEqual(got1, want1) {
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panic(fmt.Sprintf("_Values(%v) = %v, want %v", m1, got1, want1))
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}
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got2 := _Values(m2)
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want2 := []string{"16", "2", "4", "8"}
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sort.Strings(got2)
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if !_SliceEqual(got2, want2) {
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panic(fmt.Sprintf("_Values(%v) = %v, want %v", m2, got2, want2))
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}
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}
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func TestEqual() {
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if !_Equal(m1, m1) {
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panic(fmt.Sprintf("_Equal(%v, %v) = false, want true", m1, m1))
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}
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if _Equal(m1, nil) {
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panic(fmt.Sprintf("_Equal(%v, nil) = true, want false", m1))
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}
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if _Equal(nil, m1) {
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panic(fmt.Sprintf("_Equal(nil, %v) = true, want false", m1))
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}
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if !_Equal[int, int](nil, nil) {
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panic("_Equal(nil, nil) = false, want true")
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}
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if ms := map[int]int{1: 2}; _Equal(m1, ms) {
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panic(fmt.Sprintf("_Equal(%v, %v) = true, want false", m1, ms))
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}
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// Comparing NaN for equality is expected to fail.
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mf := map[int]float64{1: 0, 2: math.NaN()}
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if _Equal(mf, mf) {
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panic(fmt.Sprintf("_Equal(%v, %v) = true, want false", mf, mf))
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}
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}
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func TestCopy() {
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m2 := _Copy(m1)
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if !_Equal(m1, m2) {
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panic(fmt.Sprintf("_Copy(%v) = %v, want %v", m1, m2, m1))
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}
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m2[16] = 32
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if _Equal(m1, m2) {
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panic(fmt.Sprintf("_Equal(%v, %v) = true, want false", m1, m2))
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}
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}
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func TestAdd() {
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mc := _Copy(m1)
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_Add(mc, mc)
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if !_Equal(mc, m1) {
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panic(fmt.Sprintf("_Add(%v, %v) = %v, want %v", m1, m1, mc, m1))
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}
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_Add(mc, map[int]int{16: 32})
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want := map[int]int{1: 2, 2: 4, 4: 8, 8: 16, 16: 32}
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if !_Equal(mc, want) {
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panic(fmt.Sprintf("_Add result = %v, want %v", mc, want))
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}
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}
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func TestSub() {
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mc := _Copy(m1)
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_Sub(mc, mc)
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if len(mc) > 0 {
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panic(fmt.Sprintf("_Sub(%v, %v) = %v, want empty map", m1, m1, mc))
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}
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mc = _Copy(m1)
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_Sub(mc, map[int]int{1: 0})
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want := map[int]int{2: 4, 4: 8, 8: 16}
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if !_Equal(mc, want) {
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panic(fmt.Sprintf("_Sub result = %v, want %v", mc, want))
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}
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}
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func TestIntersect() {
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mc := _Copy(m1)
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_Intersect(mc, mc)
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if !_Equal(mc, m1) {
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panic(fmt.Sprintf("_Intersect(%v, %v) = %v, want %v", m1, m1, mc, m1))
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}
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_Intersect(mc, map[int]int{1: 0, 2: 0})
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want := map[int]int{1: 2, 2: 4}
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if !_Equal(mc, want) {
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panic(fmt.Sprintf("_Intersect result = %v, want %v", mc, want))
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}
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}
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func TestFilter() {
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mc := _Copy(m1)
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_Filter(mc, func(int, int) bool { return true })
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if !_Equal(mc, m1) {
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panic(fmt.Sprintf("_Filter(%v, true) = %v, want %v", m1, mc, m1))
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}
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_Filter(mc, func(k, v int) bool { return k < 3 })
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want := map[int]int{1: 2, 2: 4}
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if !_Equal(mc, want) {
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panic(fmt.Sprintf("_Filter result = %v, want %v", mc, want))
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}
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}
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func TestTransformValues() {
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mc := _Copy(m1)
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_TransformValues(mc, func(i int) int { return i / 2 })
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want := map[int]int{1: 1, 2: 2, 4: 4, 8: 8}
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if !_Equal(mc, want) {
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panic(fmt.Sprintf("_TransformValues result = %v, want %v", mc, want))
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}
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}
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func main() {
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TestKeys()
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TestValues()
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TestEqual()
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TestCopy()
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TestAdd()
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TestSub()
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TestIntersect()
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TestFilter()
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TestTransformValues()
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}
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