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47// ssz: Go Simple Serialize (SSZ) codec library
// Copyright 2024 ssz Authors
// SPDX-License-Identifier: BSD-3-Clause
package ssz
import (
"reflect"
"sync"
)
// zeroCache contains zero-values for dynamic objects that got hit during codec
// operations. This is a global sync map, meaning it will be slow to access, but
// encoding/hashing zero values should not happen in production code, it's more
// of a sanity thing to handle weird corner-cases without blowing up.
var zeroCache = new(sync.Map)
// zeroValueStatic retrieves a previously created (or creates one on the fly)
// zero value for a static object to support operating on half-initialized
// objects (useful for tests mainly, but can also avoid crashes in case of bad
// calling parameters).
func zeroValueStatic[T newableStaticObject[U], U any]() T {
kind := reflect.TypeFor[U]()
if val, ok := zeroCache.Load(kind); ok {
return val.(T)
}
val := T(new(U))
zeroCache.Store(kind, val)
return val
}
// zeroValueDynamic retrieves a previously created (or creates one on the fly)
// zero value for a dynamic object to support operating on half-initialized
// objects (useful for tests mainly, but can also avoid crashes in case of bad
// calling parameters).
func zeroValueDynamic[T newableDynamicObject[U], U any]() T {
kind := reflect.TypeFor[U]()
if val, ok := zeroCache.Load(kind); ok {
return val.(T)
}
val := T(new(U))
zeroCache.Store(kind, val)
return val
}