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