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isc30/polymorphic_get.hpp

Created September 16, 2018 10:16
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polymorphic_get.hpp
template<typename TBase, typename... Types>
constexpr auto polymorphic_get(std::variant<Types...>& v)
-> std::enable_if_t<(std::is_base_of_v<TBase, Types> && ...), TBase&>
{
return *std::visit([](auto& x){ return dynamic_cast<TBase*>(&x); }, v);
}
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