Using __restrict__ on a class member variable

[SzH]

I posted this to the gcc-help mailing list, but got no reply there. So 
here are the questions:

First question:

Is it possible to use the __restrict__ qualifier on a member
variable, like in the example below?

class array {
    double * __restrict__ data;
...
...
};

The compiler gives no error message, but does declaring 'data' as
a __restrict__ed pointer have any effect on functions that accept
references to 'array's as arguments?

The gcc documentation only mentions using __restrict__ on function
arguments or member functions, [1] and in that case only that single 
function is affected which has the declaration.

Second question:

If this does not work, how can I achieve the same effect as with

void fun(double * __restrict__ arr1, double * __restrict__ arr2)
{ ... }

if I use array & instead of double *? (The problem is that the class 
'array' does not contain the actual data, just a pointer to it.)

[1] 
http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Restricted-Pointers.html#index-restricted-pointers-2455