On 12/22/2010 06:06 AM, les wrote: > On Wed, 2010-12-22 at 13:49 -0500, Jerry Feldman wrote: >> On 12/22/2010 01:40 PM, Parshwa Murdia wrote: >>> On Wed, Dec 22, 2010 at 4:09 PM, les <hlhowell@xxxxxxxxxxx >>> <mailto:hlhowell@xxxxxxxxxxx>> wrote: >>> >>> Since C++ is a preprocessor to C, how does it run circles around C? >>> Just asking. >>> >>> >> C++ is NOT a preprocessor to C. Some of the original C++ systems >> certainly were, but nearly all C++ compilers are true compilers. A >> properly optimized simple C++ program should be able to perform as well >> as C. But, when you start taking into account template classes, and a >> bunch of other things, then performance takes a back seat. Our code has >> over 1,000,000 lines of code, and I would hate to have to maintain it as >> a C system. (I'm glad I don't have to maintain it in the first place). >> > <off thread> > I guess I should have stated that as "could be a preprocessor". > > I also must be showing my age ;-:) (showing the toothless, dentureless > smile) > > Seriously, though the points you make about template classes, along with > over use of inheritance, and bulky code in some classes makes C++ really > a drag on high speed computing I think. > > I use C a lot, probably too much, but I don't do much in the way of > huge programs. Most are 12,000 lines or less and I only get about 3 > months to deliver them at most. Also the systems and people I deliver > to, don't have extensive OOP experience and since they often maintain, > or extend/maintain/modify the code, C++ would be a hardship on some of > that, where as C's basic structure is a bit more challenging, but gives > more direct control for their work. The largest code I ever personally > developed was just over 40,000 lines. > </offthread> > > > > Basically, C++ is not going to work well in a high performance computing environment. Templates and inheritance have their place. In essence C++ and other OOP models should be designed. While that goes for all code, a poorly designed C++ system could certainly have issues. But, I don't want to get into the benefits of any one language. I've had to work with classes that were not properly designed to where I had to write a base class and take the existing class and inherit from the new base so that the existing code would work. -- Jerry Feldman <gaf@xxxxxxx> Boston Linux and Unix PGP key id: 537C5846 PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB CA3B 4607 4319 537C 5846
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