namespace boost {

// Throws: std::bad_cast if ( dynamic_cast<Derived>(x) == 0 )
// Returns: dynamic_cast<Derived>(x)
template <class Derived, class Base>
inline Derived polymorphic_cast(Base* x);

// Effects: assert( dynamic_cast<Derived>(x) == x );
// Returns: static_cast<Derived>(x)
template <class Derived, class Base>
inline Derived polymorphic_downcast(Base* x);

// Effects: assert( dynamic_cast<Derived>(&x) == &x );
// Returns: static_cast<Derived>(x)
template <class Derived, class Base>
inline Derived polymorphic_downcast(Base& x);

// Throws: std::bad_cast if ( dynamic_pointer_cast<Derived>(x) == 0 )
// Returns: dynamic_pointer_cast<Derived>(x)
template <class Derived, class Base>
inline auto polymorphic_pointer_cast(Base x);

// Effects: assert( dynamic_pointer_cast<Derived>(x) == x );
// Returns: static_pointer_cast<Derived>(x)
template <class Derived, class Base>
inline auto polymorphic_pointer_downcast(Base x);

}