// It thing for smooth node


// in_ is VArray of input field

Array<bool> access_mask(in_.size(), false);

Array<T> swap_buffer_a(is_.size());
Array<T> swap_buffer_b(is_.size());

bool swap_flag = true;

VArray field_access = blender::VArray<T>::ForFunc(in_.size(),
	[access_mask, swap_buffer_a, swap_buffer_b, swap_flag, in_](const int index){
		if (access_mask[index]){
			if (swap_flag) {
				return swap_buffer_a[index];
			}else{
				return swap_buffer_b[index];
			}
		}else{
			swap_buffer_a[index] = in[in_]; // Mean that the entire buffer will be filled on the first loop
			// I will be read/write A and B buffer after i write one of this
			access_mask[index] = true;
			return swap_buffer_a[index];
		}
	});
...
// And so... i can just return this like VArray as final field?
if (swap_flag) { // for no make finalaze of all elements by myself
	return blender::VArray<T>::ForFunc(in_.size(),
		[access_mask, swap_buffer_a, in_](const int index){
			if (access_mask[index]){
				return swap_buffer_a[index];
			}else{
				return in_[index];
			}
		});
}else{
	return blender::VArray<T>::ForFunc(in_.size(),
		[access_mask, swap_buffer_b, in_](const int index){
			if (access_mask[index]){
				return swap_buffer_b[index];
			}else{
				return in_[index];
			}
		});
}