polymorphic_pointer_downcast.h

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#pragma once

template <typename Derived, typename Base>
inline std::shared_ptr<Derived> polymorphic_pointer_downcast(
   const std::shared_ptr<Base>& b)
{
#ifdef _DEBUG
   std::shared_ptr<Derived> d(std::dynamic_pointer_cast<Derived>(b));
   assert(d);
   return d;
#else
   return std::static_pointer_cast<Derived>(b);
#endif
}