anonam

template< typename T >
struct with_pimpl {
protected:
    template< typename ... Args >
    explicit with_pimpl (Args &&... args) : pimpl (new (this->pimpl_mem) T (std::forward< Args > (args)...)) {}
    ~with_pimpl () { this->pimpl->~T (); }
protected:
    T *pimpl = nullptr;
private:
    char pimpl_mem [sizeof (T)] = { 0 };
};