You can use incomplete struct types in C++ as easily as in C. If you are hiding implementation, the struct will likely have a single data member struct priva

You can use incomplete struct types in C++ as easily as in C. If you are hiding implementation, the struct will likely have a single data member struct private_impl_type; std::unique_ptr<private_impl_type> impl; If you choose this, you trade off optimization opportunities. Your choice.