Downcast.hpp

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//
// Aurora C++ Library
// Copyright (c) 2012-2016 Jan Haller
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//


#ifndef AURORA_DOWNCAST_HPP
#define AURORA_DOWNCAST_HPP

#include <cassert>
#include <type_traits>


namespace aurora
{


template <typename To, typename From>
To downcast(From& base)
{
    assert(dynamic_cast<typename std::remove_reference<To>::type*>(&base));
    return static_cast<To>(base);
}

template <typename To, typename From>
To downcast(From* base)
{
    assert(dynamic_cast<To>(base));
    return static_cast<To>(base);
}


} // namespace aurora

#endif // AURORA_DOWNCAST_HPP