https://github.com/martinmoene/martin-moene.blogspot.com/blob/master/Static%20polymorphic%20named%20parameters%20in%20C%2B%2B/curve.hpp

#if __cplusplus == 201103L

namespace std
{
    template< class T, class... Args >
    unique_ptr<T> make_unique( Args&&... args )
    {
        return unique_ptr<T>( new T( std::forward<Args>( args )... ) );
    }
}
#endif

// crtp_cast:

template<class D, class B> D & crtp_cast(B & p) { return static_cast<D &>( p ); }
template<class D, class B> D const & crtp_cast(B const & p) { return static_cast<D const &>( p ); }
template<class D, class B> D volatile & crtp_cast(B volatile & p) { return static_cast<D volatile &>( p ); }
template<class D, class B> D const volatile & crtp_cast(B const volatile & p) { return static_cast<D const volatile &>( p ); }