| // run -gcflags=-G=3 |
| |
| // Copyright 2021 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| import ( |
| "fmt" |
| ) |
| |
| type Ordered interface { |
| type int, int8, int16, int32, int64, |
| uint, uint8, uint16, uint32, uint64, uintptr, |
| float32, float64, |
| string |
| } |
| |
| // List is a linked list of ordered values of type T. |
| type list[T Ordered] struct { |
| next *list[T] |
| val T |
| } |
| |
| func (l *list[T]) largest() T { |
| var max T |
| for p := l; p != nil; p = p.next { |
| if p.val > max { |
| max = p.val |
| } |
| } |
| return max |
| } |
| |
| |
| func main() { |
| i3 := &list[int]{nil, 1} |
| i2 := &list[int]{i3, 3} |
| i1 := &list[int]{i2, 2} |
| if got, want := i1.largest(), 3; got != want { |
| panic(fmt.Sprintf("got %d, want %d", got, want)) |
| } |
| |
| b3 := &list[byte]{nil, byte(1)} |
| b2 := &list[byte]{b3, byte(3)} |
| b1 := &list[byte]{b2, byte(2)} |
| if got, want := b1.largest(), byte(3); got != want { |
| panic(fmt.Sprintf("got %d, want %d", got, want)) |
| } |
| |
| f3 := &list[float64]{nil, 13.5} |
| f2 := &list[float64]{f3, 1.2} |
| f1 := &list[float64]{f2, 4.5} |
| if got, want := f1.largest(), 13.5; got != want { |
| panic(fmt.Sprintf("got %f, want %f", got, want)) |
| } |
| |
| s3 := &list[string]{nil, "dd"} |
| s2 := &list[string]{s3, "aa"} |
| s1 := &list[string]{s2, "bb"} |
| if got, want := s1.largest(), "dd"; got != want { |
| panic(fmt.Sprintf("got %s, want %s", got, want)) |
| } |
| } |