rtticast.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
#pragma once
 
template<typename T, typename Arg>
T* rtti_cast(Arg object) 
{
    return object && object->get_type().template is_derived_from<T>() ?
        reinterpret_cast<T*>(object) : nullptr;
};
 
 
template<typename Derived, typename Base>
std::unique_ptr<Derived> rtti_cast(std::unique_ptr<Base>& pointer)
{
    if (Derived *result = rtti_cast<Derived>(pointer.get()))
    {
        pointer.release();
        return std::unique_ptr<Derived>(result);
    }
    return std::unique_ptr<Derived>(nullptr);
}