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/usr/include/bobcat/refcount is in libbobcat-dev 3.19.01-1ubuntu1.

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#ifndef INCLUDED_BOBCAT_REFCOUNT_
#define INCLUDED_BOBCAT_REFCOUNT_

#include <iostream>
#include <typeinfo>

namespace FBB
{

class RefCount
{
    mutable size_t d_refcount;

    protected:
        RefCount();
        RefCount(RefCount const &other);           // used by clone()

        virtual ~RefCount();

    public:
        size_t refcount() const;
        void release();

        template <typename X>
        static X *share(X const *x);

        template <typename X>
        static X &modifying(X **x);

    private:
        virtual RefCount *clone() const = 0;
};

inline RefCount::RefCount() 
:
    d_refcount(1)
{}

inline RefCount::RefCount(RefCount const &other)           // used by clone()
:
    d_refcount(1)
{}

inline size_t RefCount::refcount() const
{
    return d_refcount;
}

template <typename X>
X *RefCount::share(X const *x)
{
    x->d_refcount++;
    return const_cast<X *>(x);
}

template <typename X>
X &RefCount::modifying(X **x)
{
    if ((*x)->d_refcount != 1)
    {
        (*x)->d_refcount--;
        *x = dynamic_cast<X *>
             (
                reinterpret_cast<RefCount *>(*x)->clone()
             );

        if (!*x)
            throw std::bad_cast();
    }
    return **x;
}

} // FBB
        
#endif