Type field added to the Wrapper class.

include/detail/wrapper.h

        }
 
 
+       using type = T;
+
+
    private:
 
        Wrapper(const T& value) noexcept(noexcept(T{value})) : m_value(value)
        }
 
 
+       using type = std::reference_wrapper<T>;
+
+
    private:
 
        std::reference_wrapper<T> m_value;