Proposal: Operator overloading without temporaries

[Regan Heath]

On Mon, 27 Mar 2006 10:29:13 +0200, Don Clugston <dac at nospam.com.au> wrote:
> Comments?

I was wondering the exact same thing recently:
http://www.digitalmars.com/drn-bin/wwwnews?digitalmars.D/35382

Do you think we gain anything by using the lhs variable where possible.  
i.e.

Instead of:

T1 = B.opMul(C);
T1.opAddAssign(D);
T1.opMulAssign(E);
T1.opSubAssign_r(A);
X = T1;

We have:

X = B;
X.opMulAssign(C);
X.opAddAssign(D);
X.opMulAssign(E);
X.opSubAssign_r(A);

It seems to me that this results in 1 less temporary and therefore 1 less  
assignment.

Of course, it doesn't help/work in cases where there is no existing lhs,  
i.e.

   foo(A - ((B*C) + D)* E);

Regan