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Construct a copy of a different allocator wrapper type.
template< typename U, typename OtherAllocator> allocator_binder( const allocator_binder< U, OtherAllocator > & other, constraint_t< is_constructible< Allocator, OtherAllocator >::value > = 0, constraint_t< is_constructible< T, U >::value > = 0);
            This constructor is only valid if the Allocator
            type is constructible from type OtherAllocator,
            and the type T is constructible
            from type U.