pitrou commented on PR #40007:
URL: https://github.com/apache/arrow/pull/40007#issuecomment-1959691532
You could either create a static constructor:
```c++
template <typename T>
class TempVectorHolder {
friend class TempVectorStack;
public:
static Result<TempVectorHolder> Make(TempVectorStack* stack, uint32_t
num_elements) {
TempVectorHolder holder{stack, nullptr, 0, num_elements};
ARROW_RETURN_NOT_OK(stack->alloc(num_elements * sizeof(T),
&holder.data_, &holder.id_));
return holder;
}
```
or, conversely, move the typed allocation API into TempVectorStack:
```c++
class ARROW_EXPORT TempVectorStack {
template <typename>
friend class TempVectorHolder;
public:
template <typename T>
Result<TempVectorHolder<T>> AllocateVector(uint32_t num_elements) {
TempVectorHolder holder{this, nullptr, 0, num_elements};
ARROW_RETURN_NOT_OK(alloc(num_elements * sizeof(T), &holder.data_,
&holder.id_));
return holder;
}
```
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