On 2/23/15 3:27 AM, Walter Bright wrote:
On 2/23/2015 1:50 AM, Manu via Digitalmars-d wrote:
1. Increment and decrement, ESPECIALLY DECREMENT, is EXPENSIVE in
time and
bloat because of exceptions. Swift does it by NOT HAVING EXCEPTIONS.
This is
not an option for D.
This is going to sound really stupid... but do people actually use
exceptions regularly?
It doesn't matter if they do or not. It's a feature of D, and has to be
supported. The only time it won't matter is if the intervening code is
all 'nothrow'.
You say that's a terminal case? Generating code to properly implement
a decrement chain during unwind impacts on the non-exceptional code
path?
Since you don't believe me :-), write some shared_ptr code in C++ using
your favorite compiler, compile it, and take a look at the generated
assembler. I've asked you to do this before.
It's necessary to understand how exception unwinding works in order to
pontificate about ARC.
BTW: http://asm.dlang.org
Andrei
