Re: Atomic caching of smart pointers

On 9/16/2024 10:59 PM, Chris M. Thomasson wrote:

On 9/16/2024 10:54 PM, Paavo Helde wrote:

[...]

template<typename T>
class CachedAtomicPtr {
public:
     CachedAtomicPtr(): ptr_(nullptr) {}
>
     /// Store p in *this if *this is not yet assigned.
     /// Return pointer stored in *this, which can be \a p or not.
     Ptr<T> AssignIfNull(Ptr<T> p) {
         const T* other = nullptr;
         if (ptr_.compare_exchange_weak(other, p.get(), std::memory_order_release, std::memory_order_acquire)) {
             p->IncrementRefcount();
             return p;
         } else {
             // wrap in an extra smartptr (increments refcount)
             return Ptr<T>(other);
         }

^^^^^^^^^^^^^^^^^^
Is Ptr<T> an intrusive reference count? I assume it is.
[...]