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Assists the variant objects.
Syntax
template <class T>
struct variant_size; // not defined
template <class T>
struct variant_size<const T>;
template <class T>
struct variant_size<volatile T>;
template <class T>
struct variant_size<const volatile T>;
template <class T>
inline constexpr size_t variant_size_v = variant_size<T>::value;
template <class... Types>
struct variant_size<variant<Types...>>;