issue57184.go

     1  // run
     2  
     3  // Copyright 2022 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import (
    10  	"log"
    11  	"reflect"
    12  	"sort"
    13  )
    14  
    15  func main() {
    16  	const length = 257
    17  	x := make([]int64, length)
    18  	for i := 0; i < length; i++ {
    19  		x[i] = int64(i) * 27644437 % int64(length)
    20  	}
    21  
    22  	isLessStatic := func(i, j int) bool {
    23  		return x[i] < x[j]
    24  	}
    25  
    26  	isLessReflect := reflect.MakeFunc(reflect.TypeOf(isLessStatic), func(args []reflect.Value) []reflect.Value {
    27  		i := args[0].Int()
    28  		j := args[1].Int()
    29  		b := x[i] < x[j]
    30  		return []reflect.Value{reflect.ValueOf(b)}
    31  	}).Interface().(func(i, j int) bool)
    32  
    33  	sort.SliceStable(x, isLessReflect)
    34  
    35  	for i := 0; i < length-1; i++ {
    36  		if x[i] >= x[i+1] {
    37  			log.Fatalf("not sorted! (length=%v, idx=%v)\n%v\n", length, i, x)
    38  		}
    39  	}
    40  }
    41
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