On 9/24/12 4:17 AM, Don Clugston wrote:
Regarding the comma operator: I'd love to deprecate it, but even if we don't, could we at least ensure that this kind of rubbish doesn't compile:void main() { int x; x > 0, x += 5; } At present, because comma expressions are expressions, not statements, the "x > 0" doesn't generate a "statement has no effect" error, despite the fact that it is meaningless and gets completely discarded.
Interesting. The comma operator is probably the only one in which an expression is evaluated only for the sake of its side effects. So eliminating the comma operator would just get rid of that case by design.
Of course, there's always the option of adding more checks or rewriting the comma operator from "expr1, expr2, expr3" to "{ expr1; expr2; return expr3; }()".
Andrei
