mirror of https://go.googlesource.com/go
66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
// build -goexperiment arenas
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// Copyright 2023 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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"arena"
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"log"
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"reflect"
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)
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func main() {
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a := arena.NewArena()
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defer a.Free()
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const iValue = 10
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i := arena.New[int](a)
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*i = iValue
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if *i != iValue {
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// This test doesn't reasonably expect this to fail. It's more likely
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// that *i crashes for some reason. Still, why not check it.
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log.Fatalf("bad i value: got %d, want %d", *i, iValue)
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}
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const wantLen = 125
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const wantCap = 1912
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sl := arena.MakeSlice[*int](a, wantLen, wantCap)
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if len(sl) != wantLen {
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log.Fatalf("bad arena slice length: got %d, want %d", len(sl), wantLen)
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}
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if cap(sl) != wantCap {
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log.Fatalf("bad arena slice capacity: got %d, want %d", cap(sl), wantCap)
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}
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sl = sl[:cap(sl)]
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for j := range sl {
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sl[j] = i
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}
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for j := range sl {
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if *sl[j] != iValue {
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// This test doesn't reasonably expect this to fail. It's more likely
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// that sl[j] crashes for some reason. Still, why not check it.
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log.Fatalf("bad sl[j] value: got %d, want %d", *sl[j], iValue)
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}
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}
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t := reflect.TypeOf(int(0))
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v := reflect.ArenaNew(a, t)
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if want := reflect.PointerTo(t); v.Type() != want {
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log.Fatalf("unexpected type for arena-allocated value: got %s, want %s", v.Type(), want)
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}
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i2 := v.Interface().(*int)
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*i2 = iValue
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if *i2 != iValue {
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// This test doesn't reasonably expect this to fail. It's more likely
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// that *i crashes for some reason. Still, why not check it.
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log.Fatalf("bad i2 value: got %d, want %d", *i2, iValue)
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}
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}
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