lifetime_watcher.h

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#pragma once
 
#include <memory>
 
namespace osc
{
    class SharedLifetimeBlock;
 
    // a non-owning reference to a lifetime block that can be queried at
    // runtime (via `expired`) to check if the lifetime is still alive
    class LifetimeWatcher final {
    public:
        constexpr LifetimeWatcher() = default;
 
        bool expired() const noexcept { return ptr_.expired(); }
    private:
        friend class SharedLifetimeBlock;
        explicit LifetimeWatcher(const std::shared_ptr<int>& ptr) :
            ptr_{ptr}
        {}
 
        std::weak_ptr<int> ptr_;
    };
}