tr1::array initialization

["Tom Browder" <tom dot browder at gmail dot com>]

I've searched this list as well as google and the c++ committee
information I've found on gcc.gnu.org and haven't seen any discussion
about this nice-to-have initialization of tr1::array:

tr1::array<int> a = { 1, 4, 6 }; // instead of tr1::array<int,N> a = {...}

I was disappointed when I first learned of the tr1::array because I
was sure that an initializer would be allowed similar to

int a[] = {1, 4, 6};

Why can't we let the compiler figure out the N?

Such an initializer would help in auto-generated code when N is not
known in advance.

Thanks.

-Tom