mirror of
https://github.com/golang/go
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e24977d231
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>
104 lines
2.4 KiB
Go
104 lines
2.4 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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)
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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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// _List is a linked list of ordered values of type T.
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type _List[T Ordered] struct {
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next *_List[T]
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val T
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}
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func (l *_List[T]) Largest() T {
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var max T
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for p := l; p != nil; p = p.next {
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if p.val > max {
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max = p.val
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}
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}
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return max
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}
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type OrderedNum 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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}
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// _ListNum is a linked _List of ordered numeric values of type T.
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type _ListNum[T OrderedNum] struct {
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next *_ListNum[T]
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val T
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}
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const Clip = 5
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// clippedLargest returns the largest in the list of OrderNums, but a max of 5.
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// Test use of untyped constant in an expression with a generically-typed parameter
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func (l *_ListNum[T]) ClippedLargest() T {
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var max T
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for p := l; p != nil; p = p.next {
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if p.val > max && p.val < Clip {
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max = p.val
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}
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}
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return max
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}
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func main() {
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i3 := &_List[int]{nil, 1}
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i2 := &_List[int]{i3, 3}
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i1 := &_List[int]{i2, 2}
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if got, want := i1.Largest(), 3; got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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b3 := &_List[byte]{nil, byte(1)}
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b2 := &_List[byte]{b3, byte(3)}
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b1 := &_List[byte]{b2, byte(2)}
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if got, want := b1.Largest(), byte(3); got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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f3 := &_List[float64]{nil, 13.5}
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f2 := &_List[float64]{f3, 1.2}
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f1 := &_List[float64]{f2, 4.5}
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if got, want := f1.Largest(), 13.5; got != want {
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panic(fmt.Sprintf("got %f, want %f", got, want))
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}
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s3 := &_List[string]{nil, "dd"}
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s2 := &_List[string]{s3, "aa"}
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s1 := &_List[string]{s2, "bb"}
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if got, want := s1.Largest(), "dd"; got != want {
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panic(fmt.Sprintf("got %s, want %s", got, want))
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}
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j3 := &_ListNum[int]{nil, 1}
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j2 := &_ListNum[int]{j3, 32}
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j1 := &_ListNum[int]{j2, 2}
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if got, want := j1.ClippedLargest(), 2; got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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g3 := &_ListNum[float64]{nil, 13.5}
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g2 := &_ListNum[float64]{g3, 1.2}
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g1 := &_ListNum[float64]{g2, 4.5}
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if got, want := g1.ClippedLargest(), 4.5; got != want {
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panic(fmt.Sprintf("got %f, want %f", got, want))
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}
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}
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