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c++ Programming Glossary: coreIs gcc4.7 buggy about regular expressions? [duplicate] http://stackoverflow.com/questions/12530406/is-gcc4-7-buggy-about-regular-expressions trying to write toy programs to test std regex are not our core userbase and whining about a product you got for free doesn't..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code The basic mantra is fast memory is expensive . This is the core reason for the advanced caching we see today. Caching is one..
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior only memory so the first assignment attempt results in a core dump . This is exactly the problem with undefined behavior...
C++ Timer function to provide time in nano seconds http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds sure you do not have those chipset. Additionally some dual core AMDs may also cause a problem . See the second post by sebbbi.. issues. For example in Windows XP all AMD Athlon X2 dual core CPUs return the PC of either of the cores randomly the PC sometimes.. Athlon X2 dual core CPUs return the PC of either of the cores randomly the PC sometimes jumps a bit backwards unless you..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom elsewhere and that's a terrible thing. In our case the core of it is only two lines the allocation and the copy but with..
Why does C++ not have reflection? http://stackoverflow.com/questions/359237/why-does-c-not-have-reflection Is there really a huge benefit in adding features the core language which can already mostly be done through libraries..
What are the barriers to understanding pointers and what can be done to overcome them? http://stackoverflow.com/questions/5727/what-are-the-barriers-to-understanding-pointers-and-what-can-be-done-to-overcome changed by anything other than the memory allocator or the core system routines or you risk crashing the program. Allocate memory..
WChars, Encodings, Standards and Portability http://stackoverflow.com/questions/6300804/wchars-encodings-standards-and-portability an idiomatic portable universal encoding agnostic program core using only pure standard C C together with a well defined I.. text you should make the iconv conversion part of the core and use uint32_t char32_t strings internally with UCS 4. Windows.. an idiomatic portable universal encoding agnostic program core using only pure standard C C No and there is no way at all to..
Why artificially limit your code to C? [closed] http://stackoverflow.com/questions/649789/why-artificially-limit-your-code-to-c g g O1 pedantic mfpmath sse DUSE_SSE2 DUSE_XMM3 I src core L usr lib DARCH elf64 D_BSD_SOURCE DPOSIX D_ISOC99_SOURCE D_POSIX_C_SOURCE.. Wextra Wwrite strings Wredundant decls Werror Isrc src core kin_object.c c o obj kin_object.o wc l In file included from.. c o obj kin_object.o wc l In file included from src core kin_object.c 22 src core kin_object.h 791 28 error anonymous..
OpenCV 2.3 C++ Visual Studio 2010 http://stackoverflow.com/questions/7011238/opencv-2-3-c-visual-studio-2010 of the C interface that refer to C headers as opencv2 core . Then add the path of the libraries on Configuration Properties.. this simple test we are going to add the libraries opencv_core230.lib and opencv_highgui230.lib . So go to Configuration Properties..
Why is one loop so much slower than two loops? http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops to heap memory and my numerical code has the following core loop. const int n 100000 for int j 0 j n j a1 j b1 j c1 j d1..
Why is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array it's valid for all the input values of data . Benchmarks Core i7 920 @ 3.5 GHz C Visual Studio 2010 x64 Release Branch Random..
Why is my program slow when looping over exactly 8192 elements? http://stackoverflow.com/questions/12264970/why-is-my-program-slow-when-looping-over-exactly-8192-elements no longer get random slow downs on large powers of two. Core i7 920 @ 3.5 GHz Original code 8191 1.499 seconds 8192 2.122..
Very poor boost::lexical_cast performance http://stackoverflow.com/questions/1250795/very-poor-boostlexical-cast-performance poor boost lexical_cast performance Windows XP SP3. Core 2 Duo 2.0 GHz. I'm finding the boost lexical_cast performance..
http://stackoverflow.com/questions/3065154/undefined-reference-to-vtable std vector CDasherModule size_type ModuleID_t ingroup Core @ class CDasherModule public Dasher CDasherComponent public.. CEvent class CEventHandler class CDasherComponent ingroup Core @ class Dasher CDasherComponent public CDasherComponent Dasher..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali C 2010 x86 cl Ox EHsc Windows 7 Ultimate 64 bit Intel Core i7 8 GB RAM ostringstream 73.4 milliseconds 71.6 ms stringbuf..
Use C++ with Cocoa Instead of Objective-C? http://stackoverflow.com/questions/525609/use-c-with-cocoa-instead-of-objective-c out on some of the OS X specific technologies such as Core Animation and some QuickTime functionality though there are..
http://stackoverflow.com/questions/601558/multithreading-reference Isolation Asynchronous Messages Parallel and Multi Core Computing with C C Thinking in Concurrently in .NET Programming..
What breaking changes are introduced in C++11? http://stackoverflow.com/questions/6399615/what-breaking-changes-are-introduced-in-c11 of so I leave those for others to elaborate on. Core language #define u8 abc const char s u8 def Previously abcdef..
How can I create directory tree in C++/Linux? http://stackoverflow.com/questions/675039/how-can-i-create-directory-tree-in-c-linux and reproduced the problem on a MacBook Pro 2.3GHz Intel Core i7 running Mac OS X 10.7.4 and suggests that the problem is..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle . a.out 1000 produces the following output on an Intel Core i5 750 2.66 GHz addmul 0.270 s 3.707 Gflops res 1.326463 i.e... at least on my system and for my simple programme . My Core i5 750 Nahelem architecture doesn't like alternating add's and.. code which is fairly long achieves close to optimal on my Core i7 2600K. The key thing to note here is the massive amount of..
Why is one loop so much slower than two loops? http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops full optimization and SSE2 enabled for 32 bit on a Intel Core 2 Duo x64 the first example takes 5.5 seconds and the double.. pause return 0 Benchmark Results EDIT Results on an actual Core 2 architecture machine 2 x Intel Xeon X5482 Harpertown @ 3.2.. Sandy Bridge but the idea should still be applicable to Core 2. Region 3 At this point the data no longer fits in L1 cache...
Why does changing 0.1f to 0 slow down performance by 10x? http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x almost zero values we just round to zero instead. Timings Core i7 920 @ 3.5 GHz Don't flush denormals to zero. 0.1f 0.564067..
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