Cleaned up C++

[Walter Bright via Digitalmars-d]

On 4/22/2015 12:51 PM, ponce wrote:
> I didn't appreciate how important default initialization was before having to
> fix a non-deterministic, release-only, time-dependent bug in a video encoder
> some months ago. Just because of 2 uninitialized variables (C++ doesn't require
> member initialization in constructor). If one of them was _exactly equal to 1_
> by virtue of randomness, then it would perform from 0 to 2 billions of motion
> estimation steps, which is very slow but not a total halt. A watchdog mechanism
> would detect this and reboot, hence labelling the bug "a deadlock". It would
> disappear in debug mode since variables would be initialized then.

The default initialization comes from bitter personal experience, much like yours!


> That gives a totally other meaning to "zero cost abstractions" since in three
> weeks of investigation I could have speed-up the program by ~5%, much more than
> the supposed slowdown of variable initialization.

Most of the implicit initializations become "dead stores" and are removed anyway 
by the optimizer.