On 09/28/2012 10:10 AM, Sergey Senozhatsky wrote:
On (09/28/12 09:54), Chris Ferron wrote:
[..]
Well to be fair, not that I agree any-more, but years ago it was
common practice to disable exceptions (via the compiler) for C++ in
very specialized "REAL" "Embedded Systems". This practice was
problematic in that you needed to have a will defined Error handling
design, but saved space. Honestly, its been a long time since I
worked on anything that has a "REAL" size requirement, so I don't see
the point. On the other hand in some Embedded system The whole
reason to using your own error handling design was that in a real
embedded system, design considerations like, uptime, failure control
and ability to eliminate undefined behaviour were KEY. So taking the
time to design was already a given, and size was not a single point
factor. (not arguing the C vs C++ point here BTW) So for what ever
reason the decision to use C++ happens for an embedded project.
Problem was C++ exception were good for insure the program didn't
fail, but detailed failure handling became problematic. Sure you
could avoid general failures but often especially in an embedded
system you found yourself with undefined behaviour that was nearly
imposable to handle. OK in general history over :)
Unfortunately this practice has been inherited still today in
segments of other then embedded. Most commonly you may see this
practice in specialized segments like gaming consoles. Such practices
are still in valid use in such device as switches,
telecommunications, avionic systems, weapon systems, medical devices,
ect.
So I have an understanding of the issues, "some" of its history, and
valid uses. But in my opinion this is still a bad implementation for
anyone distributing a general operating system.
Sure, I totally agree. Nowadays, with 4 CPU cores in a pocket, I simply don't
buy
"exceptions are slow" argument. If in some particular project exceptions are so
common that they're able to sensibly slow down application, then the project
most
probably is doing something terribly wrong and mis-concept exceptions.
Agree
The tragedy is that at this point in time I believe Google will never consider
using
exceptions due to legacy reasons.
-ss
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