On 04/21/2012 06:54 PM, bearophile wrote:
Jonathan M Davis:
There have been discussions about the comma operator before. I don't
expect that it's going anywhere,
Maybe there are intermediate solutions between keeping wild commas in D
and disallowing them fully. I think most of my bugs caused by commas are
similar to the one shown by the OP. This means this is not a common
source of bugs:
foo(), bar();
While this is sometimes a trap:
auto x = foo(), bar();
This is not valid code.
So maybe it's enough to disallow using the last expression of a comma
sequence as result of the whole expression? I don't know. I almost never
use commas for such purposes. What are the use case for those commas?
Bye,
bearophile
if(r.front == 'a' && (r.popFront(), r.front) == 'b') { ... }
There are a few similar usages in Phobos. If comma was to be used as a
tuple constructor instead, those could be replaced by ( , )[$-1].
