I want variables! In context of my physical quantities library types resulting from calcs are computed in non-trivial ways. If the programmer has a complicated calculation then declaring a variable may force a scaling
q_area::mm2 a; q_length:: mm b; q_length::m c = a / b;
In the above, the temporary result of a / b will be divided by 1000 in
"Andy Little" <andy@servocomm.freeserve.co.uk> wrote the
assign to cc, because the programmer has forced this by the l_value assignment,but:
auto c = a / b;
I don't think you really want lvalues. You would only want to preserve lvalue if you want to do something like: a /b = 5; and I don't think that is what you want. The "auto" is implemented via typeof, not via decltype. So your type is always a value. If you want a reference, you explicitly specify this: int& foo(); auto p = foo(); // int auto& p = foo(); //int& The same can be emulated with BOOST_AUTO: BOOST_AUTO(p, foo());// int BOOST_AUTO(&p, foo());//int& Arkadiy