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The joys of ++ and --

This sort of thing is one of the reasons why we have avoided increment and decrement operators in VB.

posted on Wednesday, September 01, 2004 11:56 AM

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# re: The joys of ++ and -- 9/2/2004 12:37 AM Simon Geering

What madness that is, I don't think vb developers are mission out on much from not having increment and decrement operators, other than the migraines every now an then :)

# Les op 9/2/2004 12:57 AM Richard Clark

# re: The joys of ++ and -- 9/2/2004 8:05 AM Michael Russell

My biggest problem with these oh-so-wonderful operators is the undefined order of side-effects.

About four years ago, I was working as a test lead on a game, and we were trying to upgrade from Visual C++ 4.2 to Visual C++ 6.0 so we could use the newest DirectX libraries to help us out with a bug. The project was over 320KLOC, and large portions had been written by developers that were no longer around.

Once the project had been upgraded, we did a build and began testing, and found that the entire graphics engine was no longer working correctly. After tracing into the code, we found wonderful gems similar to this:

m_i++ = o->f(++m_i, ++m_i);

In VC4.2, that would compile out one way. In VC6, it would compile another way. We ended up staying in VC4.2 so that we could actually ship.

# Blog link of the week 36 9/5/2004 11:54 AM Daniel Moth

http://www.zen13120.zen.co.uk/Blog/2004/09/blog-link-of-week-36.html

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