Method ResetAndGetResidualRefCount

library/cpp/yt/memory/weak_ptr.h:269–280

//! but it requires much nastier integration with the intrusive pointer destruction routines.
template <typename T>
int ResetAndGetResidualRefCount(TIntrusivePtr<T>& pointer)
{
    auto weakPointer = MakeWeak(pointer);
    pointer.Reset();
    pointer = weakPointer.Lock();
    if (pointer) {
        // This _may_ return 0 if we are again the only holder of the pointee.
        return pointer->GetRefCount() - 1;
    } else {
        return 0;
    }
}

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