checked_cast.hh

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#ifndef CHECKED_CAST_HH
#define CHECKED_CAST_HH
 
#include <type_traits>
#include <cassert>
 
template<typename TO, typename FROM>
[[nodiscard]] constexpr TO checked_cast(FROM* from)
{
        assert(dynamic_cast<TO>(from) == static_cast<TO>(from));
        return static_cast<TO>(from);
}
template<typename TO, typename FROM>
[[nodiscard]] constexpr TO checked_cast(FROM& from)
{
        using TO_PTR = std::remove_reference_t<TO>*;
        TO_PTR* suppress_warning = nullptr; (void)suppress_warning;
        assert(dynamic_cast<TO_PTR>(&from) == static_cast<TO_PTR>(&from));
        return static_cast<TO>(from);
}
 
#endif