On 2014-09-04 13:29, Alexander Holler wrote: > Am 04.09.2014 16:36, schrieb Austin S Hemmelgarn: >> On 2014-09-04 06:16, Alexander Holler wrote: >>> >>> It's a myth that C++ ends up in bigger code than C. At least in my >>> experience. Especially when the latest additions to C++ are in effect >>> (like the move-semantics in C++11 I like quiet a lot and which you get >>> almost for free (by changing nothing) when you use the STL). Thread >>> support is now also standardized (in C++11), quiet nice to use. > >> Assuming you are writing in a standalone environment (no standard >> libraries), then yes, your code will usually be about the same size >> (unless you go way overboard with the object-oriented stuff); but the >> runtime is larger in almost all non-standalone environments, and there >> are some cases that code does end up larger in C++. A lot of 'Clean C' >> (stuff written so that it compiles correctly as C, C++ and Objective C) >> that I have seen seems to end up larger (by about 4-6%) when built as >> C++ (although it usually does much worse as Objective C). > > There are always corner cases and I never would use some "Clean C" code > to compare sizes of C and C++. There is a whole lot of stuff you just > can't, shouldn't or wouldn't do when using C instead of C++. > > And just throwing in some numbers without any explanation about features > (like exceptions), optimizations and so on you've enabled for the tests > you used to get those numbers, doesn't work. ;) > > I can't really comment on what you mean with "standalone environment" or > "non-standalone environment", as I don't know what you mean with that. > But if several programms share e.g. the stuff which is in libstdc++. > you'll get a lot of size back when compared with C-only programms where > everyone invents the wheel again and again. By standalone environment, I mean no libraries, no libc[++], no external dependencies, and in the case of a lot of kernel programming, no built-ins. A OS kernel HAS to be written like that, and it's easier to do that in C than C++. I doubt that you have ever looked at any source code for Windows drivers, but Windows is written in C++, and they still are just as mind-numbingly insane as some of the poorly maintained, vendor originated Linux drivers. Not all C is like the Linux kernel, and in fact, if you use Linux, probably more than half of your user-space programs were written in C. They use dynamic linking just like C++ programs (but often with less complex symbol mangling).
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