2021_12

参加者

syumai

magicpro

bnn

Nobishii

読むもの

weekly proposal review meeting

見るやつ

reflect.Value.Grow

reflect.Value.Bytes()

adressableな配列のValueからもBytes()を取りたい！

http.MaxBytesError

(*URL).PathJoin / url.JoinPath

メモ

code:golang

package main

import (

"reflect"

"testing"

)

func BenchmarkByAppend(b *testing.B) {

for i := 0; i < b.N; i++ {

s := make([]int, 0, 5)

v1 := reflect.ValueOf(&s).Elem()

v1 = reflect.Append(v1, reflect.ValueOf(1))

v1 = reflect.Append(v1, reflect.ValueOf(2))

}

}

func BenchmarkByAppend2(b *testing.B) {

for i := 0; i < b.N; i++ {

s := make([]int, 0, 5)

v1 := reflect.ValueOf(&s).Elem()

v1.Set(reflect.Append(v1, reflect.ValueOf(1)))

v1.Set(reflect.Append(v1, reflect.ValueOf(2)))

}

}

func BenchmarkBySet(b *testing.B) {

for i := 0; i < b.N; i++ {

s := make([]int, 0, 5)

v1 := reflect.ValueOf(&s).Elem()

v1.SetLen(2)

v1.Index(0).Set(reflect.ValueOf(1))

v1.Index(1).Set(reflect.ValueOf(2))

}

}

cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz

BenchmarkByAppend-16 6878270 172.4 ns/op 120 B/op 4 allocs/op

BenchmarkByAppend2-16 5854520 207.3 ns/op 120 B/op 4 allocs/op

BenchmarkBySet-16 12376485 97.96 ns/op 72 B/op 2 allocs/op

PASS