On Monday, 23 May 2016 at 14:05:43 UTC, deed wrote:
Some thoughts about extending the with-statement were brought
up here earlier:
http://forum.dlang.org/post/txpifmwpmmhsvcpbc...@forum.dlang.org
I don't care much whether it would be with, alias or possibly
something clever already existing, but a solution should be
easy to use, easy to read and shouldn't introduce any possible
overhead at runtime.
From the linked thread:
ref M() { return matrix.rawArr; }
ref Ex1() { return e1.someProperties.someModulusX; }
If we had local refs, we could use this instead:
ref m = matrix.rawArr;
The difference is m is already computed, it is not recomputed
each time m is read, unlike M(). I think the reason D doesn't
support local refs is because it would make it harder to design
@safe, particularly with the planned @rc ref-counting. Because
M() above is only a return reference, it can't live longer than
the data it references. My ref m could persist longer than
matrix.rawArr using (naive) reference counting.
BTW local refs are possible in @system code:
http://forum.dlang.org/post/lmuokynffgljzvrpv...@forum.dlang.org
