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c++ Programming Glossary: upWhy 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 some strange reason sorting the data miraculously speeds up the code by almost 6x #include algorithm #include ctime #include.. array faster than an unsorted array The code is summing up some independent terms the order should not matter. java c.. Now for the sake of argument suppose this is back in the 1800s before long distance or radio..
What can I use to profile C++ code in Linux? http://stackoverflow.com/questions/375913/what-can-i-use-to-profile-c-code-in-linux However if you're in a hurry and you can manually interrupt your program under the debugger while it's being subjectively.. of performance problems and the opportunity to get speedup . Added It might not be obvious but the stack sampling technique.. ADDED Let me make a Bayesian explanation of how it works. Suppose there is some instruction I call or otherwise which is on..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points using them If you've read this be sure to visit the follow up question Undefined Behavior and Sequence Points Reloaded . Note.. your answer is very likely to get read by those who came up with the idea. c c undefined behavior c faq sequence points.. in Section §1.3.12 as behaviour such as might arise upon use of an erroneous program construct or erroneous data for..
http://stackoverflow.com/questions/4421706/operator-overloading your answer is very likely to get read by those who came up with the idea. c operators operator overloading c faq share..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c your answer is very likely to get read by those who came up with the idea. c arrays pointers multidimensional array c faq.. to the bounds of the array. Pointers are extremely stupid . Arrays are not pointers The compiler will silently generate.. individual elements of an array. Neither of them is superior to the other and you should familiarize yourself with both...
What are the differences between pointer variable and reference variable in C++? http://stackoverflow.com/questions/57483/what-are-the-differences-between-pointer-variable-and-reference-variable-in-c of i into that storage. So pointer and reference occupies same amount of memory As a general rule Use references in.. memory address with the original variable but also takes up some space on the stack. Since a reference has the same address..
Where and why do I have to put the “template” and “typename” keywords? http://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords it. The process that determines this is called name lookup. This however presents a problem in templates How will you find.. may have different types or function calls might end up calling different functions. Such constructs are generally said.. or not. It separates them into logically different groups One catches types another catches expressions. Expressions..
Can a local variable's memory be accessed outside its scope? http://stackoverflow.com/questions/6441218/can-a-local-variables-memory-be-accessed-outside-its-scope the hotel and stole a key to illegally use later you gave up the right to live in a predictable safe world because you chose.. analogy but whatever. I thought it might be germane to update this a bit with a few more technical thoughts. Compilers.. you do you just checked out of the highest numbered occupied room. If no one else checks in after you and you go back..
Algorithm improvement for Coca-Cola can shape recognition http://stackoverflow.com/questions/10168686/algorithm-improvement-for-coca-cola-can-shape-recognition the scale invariant feature transform SIFT or Speeded Up Robust Features SURF . It is implemented in OpenCV 2.3.1. You.. rotation invariance. The original papers SURF Speeded Up Robust Features Distinctive Image Features from Scale Invariant..
union for uint32_t and uint8_t[4] undefined behavior? http://stackoverflow.com/questions/10271929/union-for-uint32-t-and-uint8-t4-undefined-behavior of the code. union addr uint8_t addr8 4 uint32_t addr32 Up to now I thought this would be a fine approach to do things..
http://stackoverflow.com/questions/1115876/autocompletion-in-vim the information found therein why not a Vim script as well Up to dateness . As soon as I change something in my file I want..
Switching from std::string to std::wstring for embedded applications? http://stackoverflow.com/questions/163962/switching-from-stdstring-to-stdwstring-for-embedded-applications from std string to std wstring for embedded applications Up until now I have been using std string in my C applications..
How to interrupt a waiting C++0x thread? http://stackoverflow.com/questions/2845704/how-to-interrupt-a-waiting-c0x-thread if you want to explicitly interrupt one thread at a time. Up to you to define the duration on the timed wait so your threads..
Aero Snap not working for my application http://stackoverflow.com/questions/2920451/aero-snap-not-working-for-my-application nVirtKey VK_LWIN cRepeat 1 ScanCode 5B fRepeat 0 fUp 0 00071 00030D1C P WM_KEYDOWN nVirtKey VK_LWIN cRepeat 1 ScanCode.. nVirtKey VK_LWIN cRepeat 1 ScanCode 5B fRepeat 1 fUp 0 00072 00030D1C P WM_KEYDOWN nVirtKey VK_LWIN cRepeat 1 ScanCode.. nVirtKey VK_LWIN cRepeat 1 ScanCode 5B fRepeat 1 fUp 0 00088 00030D1C S WM_GETMINMAXINFO lpmmi 0043FCBC 00089 00030D1C..
Brute-force, single-threaded prime factorization http://stackoverflow.com/questions/3918968/brute-force-single-threaded-prime-factorization force single threaded prime factorization Up for consideration is the following function which can be used.. it can find proven factors faster is the difficult part. Update Potatoswatter has some excellent solutions so far be sure..
Switching from Java to C++ - what's the easy way? [closed] http://stackoverflow.com/questions/403431/switching-from-java-to-c-whats-the-easy-way I need start switching to C for some assignments I have. Up until now I have been very comfortable with Java and it's concepts..
Visual Studio C++ 2008 / 2010 - break on float NaN http://stackoverflow.com/questions/4454582/visual-studio-c-2008-2010-break-on-float-nan any floating point number becomes NaN QNAN INF etc Up until now I have just been using the assert x x trick but I..
Game Objects Talking To Each Other http://stackoverflow.com/questions/4574016/game-objects-talking-to-each-other of dealing with objects and having them talk to each other Up until now all my games hobby student have been small so this..
Creating a counter that stays synchronized across MPI processes http://stackoverflow.com/questions/4948788/creating-a-counter-that-stays-synchronized-across-mpi-processes bit of embarrassingly parallel simulation work using MPI. Up until now I have structured my code to have a dispatch node.. counter works well enough you may not need to go there. Update Ok so here's a hacky attempt at doing the shared counter..
http://stackoverflow.com/questions/601558/multithreading-reference Tracing Logging and Threading Made Easy with .NET Juice Up Your App with the Power of Hyper Threading Concurrency Hazards..
Why can't I create a vector of lambda in C++11? http://stackoverflow.com/questions/7477310/why-cant-i-create-a-vector-of-lambda-in-c11 1 std vector decltype ignore v 2 v.push_back return 100 3 Up to line #2 it compiles fine . But the line#3 gives compilation..
Why does the C++ standard algorithm “count” return a ptrdiff_t instead of size_t? http://stackoverflow.com/questions/7505083/why-does-the-c-standard-algorithm-count-return-a-ptrdiff-t-instead-of-size-t difference_type which is generic and can be anything. Up until that point it makes sense. There are cases where the count..
Singleton: How should it be used http://stackoverflow.com/questions/86582/singleton-how-should-it-be-used sure it is created only once Lazy or system initialization Up to your requirements Sometimes the OS or the JVM creates singletons..
Using Quaternions for OpenGL Rotations http://stackoverflow.com/questions/9715776/using-quaternions-for-opengl-rotations 0 Rotation.z 0 PITCH if m_pApp GetInput .IsKeyDown sf Key Up true Rotation.x TurnSpeed if m_pApp GetInput .IsKeyDown sf.. matrices representing the object's rotation. STEP 2 Update quaternion I'm not 100 sure this is the way it's supposed..
How is std::iostream buffered? http://stackoverflow.com/questions/9957721/how-is-stdiostream-buffered implementing auto completion feature . What I have so far Up to now my code looks like this bool done false char c while..
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