scoped_lifetime.h

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#pragma once
 
#include <liboscar/utilities/lifetime_watcher.h>
#include <liboscar/utilities/shared_lifetime_block.h>
 
namespace osc
{
    // a managed, reference-counted, watchable lifetime that's strongly tied
    // to its position in memory (scope) - to the point that copying, moving,
    // or assigning it resets the lifetime
    class ScopedLifetime final {
    public:
        // constructs a new lifetime
        ScopedLifetime() = default;
 
        // constructs a new lifetime
        ScopedLifetime(const ScopedLifetime&) : ScopedLifetime{} {}
 
        // constructs a new lifetime
        ScopedLifetime(ScopedLifetime&&) noexcept : ScopedLifetime{} {}
 
        // replaces the lifetime with a new lifetime
        ScopedLifetime& operator=(const ScopedLifetime& rhs)
        {
            if (&rhs == this) {
                return *this;
            }
 
            lifetime_block_ = SharedLifetimeBlock{};
            return *this;
        }
 
        // replaces the lifetime with a new lifetime
        ScopedLifetime& operator=(ScopedLifetime&& rhs) noexcept
        {
            return *this = static_cast<const ScopedLifetime&>(rhs);
        }
 
        ~ScopedLifetime() noexcept = default;
 
        LifetimeWatcher watch() const { return lifetime_block_.watch(); }
    private:
        SharedLifetimeBlock lifetime_block_;
    };
}