#include <memory>
#include <type_traits>
 
struct wrapper {
    template<
        typename T
        , typename... Ts
        , typename = typename std::enable_if<
            !std::is_same<wrapper, typename std::decay<T>::type>::value
        >::type
    >
    wrapper(T&& t, Ts&&... ts)
        : p(std::forward<T>(t), std::forward<Ts>(ts)...)
    {}
 
    std::unique_ptr<int> p;
};
 
int
main()
{
    // fine
    wrapper w = nullptr;
 
    // not fine:
    // error: use of deleted function 'wrapper::wrapper(const wrapper&)'
    wrapper const cw = nullptr;
}

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