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c++ Programming Glossary: l2http://stackoverflow.com/questions/1095298/gcc-c-linker-errors-undefined-reference-to-vtable-for-xxx-undefined-refere uses lib1 write If linked like this gcc o plop plop.o l1 l2 Then the linker will fail to resolve the read and write symbols... But if I linki the application like this gcc o plop plop.o l2 l1 Then it will link correctly. As l2 resolves the BatchRead.. gcc o plop plop.o l2 l1 Then it will link correctly. As l2 resolves the BatchRead and BatchWrite dependencies but also..
http://stackoverflow.com/questions/12136923/empty-check-with-string-split ' ' f0 fname0 l0 lname0 f1 fname1 l1 lname1 f2 fname2 l2 lname2 f3 l3 . I got result in the vector as below. f0 fname0.. below. f0 fname0 l0 lname0 f1 fname1 l1 lname1 f2 fname2 l2 lname2 f3 l3 Now I again the sent the resulted strings with.. resulted strings with separator ' '. Its working fine with l2 lname2 . But for f3 and l3 My separator at last position of..
Massive CPU load using std::lock (c++11) http://stackoverflow.com/questions/13667810/massive-cpu-load-using-stdlock-c11 std mutex l1 m1 std defer_lock std unique_lock std mutex l2 m2 std defer_lock std lock l1 l2 std cout f1 has the two locks.. std unique_lock std mutex l2 m2 std defer_lock std lock l1 l2 std cout f1 has the two locks n std this_thread sleep_for std.. 100 void f2 while true std unique_lock std mutex l2 m2 std defer_lock std unique_lock std mutex l1 m1 std defer_lock..
Find out if 2 lines intersect [duplicate] http://stackoverflow.com/questions/14176776/find-out-if-2-lines-intersect segments intersect Given are two lines l1 A0 B0 A1 B1 and l2 A2 B2 A3 B3 Ax Bx are integers and Ax Bx specify the starts.. using only integer arithmetic that determines if l1 and l2 intersect Only a Boolean answer is needed. My own approach was.. ggt ABS temp 0 ABS temp 1 bool intersect line l1 line l2 const long int epsilon 1 4 vec long int 2 sl1 l1.slope sl2 l2.slope..
Why use variadic arguments now when initializer lists are avaiable? http://stackoverflow.com/questions/15465543/why-use-variadic-arguments-now-when-initializer-lists-are-avaiable
Why should `new` be used as little as possible? http://stackoverflow.com/questions/6500313/why-should-new-be-used-as-little-as-possible Consider the following program int main Line l1 Line l2 l1 Using the original version this program will likely crash..
C++ Tips for code optimization on ARM devices http://stackoverflow.com/questions/10800372/c-tips-for-code-optimization-on-arm-devices together and write them as DWORDS. 4 Be aware of your L1 L2 cache size. As a general rule ARM chips have much smaller caches..
C++ string comparison in one clock cycle http://stackoverflow.com/questions/1128096/c-string-comparison-in-one-clock-cycle if a cycle takes 1 unit a L1 hit takes 10 units an L2 hit takes 100 units and an actual RAM hit takes really long..
Structure of arrays and array of structures - performance difference http://stackoverflow.com/questions/11616941/structure-of-arrays-and-array-of-structures-performance-difference Size of a Unit object is 48 bytes. L1 cache is 256K L2 is 1MB and L3 is 8MB. What am i missing here Is this really..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code typically several levels of cache within the CPU chip L1 L2 L3 instruction caches ... RAM HDDs armed with their own caches..
Converting an FFT to a spectogram http://stackoverflow.com/questions/1679974/converting-an-fft-to-a-spectogram tells you what frequency was detected. The magnitude L2 norm of the complex number tells you how strong the detected..
http://stackoverflow.com/questions/1783822/format-of-for-loops the results are for for int i 0 i 5 i movl 0 12 ebp jmp L2 L3 leal 12 ebp eax incl eax L2 cmpl 4 12 ebp jle L3 for int.. i 0 i 5 i movl 0 12 ebp jmp L2 L3 leal 12 ebp eax incl eax L2 cmpl 4 12 ebp jle L3 for int i 0 i 5 i movl 0 12 ebp jmp L7..
http://stackoverflow.com/questions/1905417/array-vs-vector-vs-list processors we use are very fast and if your vector fits in L2 cache then it's going to go really really fast. Lists on the..
C++ performance of accessing member variables versus local variables http://stackoverflow.com/questions/238535/c-performance-of-accessing-member-variables-versus-local-variables one cycle. The object is more likely to be pushed back to L2 cache rule of thumb 10 cycles or main memory 100 cycles . However..
Can I force cache coherency on a multicore x86 CPU? http://stackoverflow.com/questions/558848/can-i-force-cache-coherency-on-a-multicore-x86-cpu processor to bring the value to L1 cache without polluting L2. I suspect that X86 cores automatically invalidate the cache..
Calculate offset/skew/rotation of similar images in C++ http://stackoverflow.com/questions/6542339/calculate-offset-skew-rotation-of-similar-images-in-c find pairs of corresponding points BruteForceMatcher L2 float matcher Use FlannBasedMatcher matcher. It is better vector..
OpenCV - Object matching using SURF descriptors and BruteForceMatcher http://stackoverflow.com/questions/7296915/opencv-object-matching-using-surf-descriptors-and-bruteforcematcher image2 keypoints2 descriptors2 BruteForceMatcher L2 float matcher vector DMatch matches matcher.match descriptors1..
Cross-platform way to get line number of an INI file where given option was found http://stackoverflow.com/questions/8358975/cross-platform-way-to-get-line-number-of-an-ini-file-where-given-option-was-foun 1 Parse success L 1 C2 .. L1 C6 Cat1 L 2 C2 .. L2 C7 name1 L 2 C8 .. L2 C12 100 L 6 C2 .. L6 C7 name2 L 6 C8 .... L 1 C2 .. L1 C6 Cat1 L 2 C2 .. L2 C7 name1 L 2 C8 .. L2 C12 100 L 6 C2 .. L6 C7 name2 L 6 C8 .. L6 C27 200 #not skipped.. C2 .. L14 C11 UsagePage L 14 C12 .. L14 C13 9 L 25 C3 .. L25 C8 Cat_3 L 29 C2 .. L29 C8 Offset L 29 C9 .. L29 C16 0x12304..
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 fits in L1 cache. So performance is capped by the L1 L2 cache bandwidth. Region 4 The performance drop in the single..
Optimal buffer size for write(2) http://stackoverflow.com/questions/8803515/optimal-buffer-size-for-write2 big e.g. fitting in some cache inside your processor e.g. L2 cache aligned in memory e.g. to a page size using posix_memalign..
C++: optimizing member variable order? http://stackoverflow.com/questions/892767/c-optimizing-member-variable-order of your object in cache and the rest in main memory or L2 cache perhaps . It's a good thing if your most common operations..
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