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c++ Programming Glossary: pointWhat is this weird colon-member syntax in the constructor? http://stackoverflow.com/questions/1711990/what-is-this-weird-colon-member-syntax-in-the-constructor listed at the end of the FAQ entry . The takeaway point from the FAQ entry is that All other things being equal your..
What should main() return in C and C++? http://stackoverflow.com/questions/204476/what-should-main-return-in-c-and-c in C int main can be left without a return value at which point it defaults to returning 0. This is also true with a C99 program...
http://stackoverflow.com/questions/3106110/what-is-move-semantics start with a very simple string class which only holds a pointer to a heap allocated block of memory #include cstring #include.. so the client has no way to inspect them again at a later point in time. rvalues denote temporary objects which are destroyed.. of deeply copying the heap data we have just copied the pointer and then set the original pointer to null. In effect we have..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom Any class that manages a resource a wrapper like a smart pointer needs to implement The Big Three . While the goals and implementation.. but swaps in general can be more efficient it merely swaps pointers and sizes rather than allocating and copying entire arrays... the compiler is doing for us now how kind. At this point we are home free because swap is non throwing. We swap our current..
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 in the process of optimizing. What tool can I use to pinpoint my slow code c unix profiling share improve this question.. way to collect call stack samples of the thread pool at a point in time as there is in Java. P.P.S As a rough generality the..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three such thing as std string and programmers were in love with pointers. The person class might have looked like this class person.. its members but copying the name member merely copies a pointer not the character array it points to This has several unpleasant.. member merely copies a pointer not the character array it points to This has several unpleasant effects Changes via a can be..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points up with the idea. c c undefined behavior c faq sequence points share improve this question Disclaimer Okay. This answer.. are Sequence Points The Standard says At certain specified points in the execution sequence called sequence points all side effects.. specified points in the execution sequence called sequence points all side effects of previous evaluations shall be complete..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c parameter passing multidimensional arrays and arrays of pointers common pitfalls when using arrays If you feel something important.. to get read by those who came up with the idea. c arrays pointers multidimensional array c faq share improve this question.. other. sizeof T n is equivalent to n sizeof T . Array to pointer decay The only connection between T n and T m is that 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 are the differences between pointer variable and reference variable in C I know references are.. are the differences Summary from answers and links below A pointer can be re assigned any number of times while a reference can.. a reference can not be reassigned after initialization. A pointer can point to NULL while reference can never point to NULL..
How do I expand a tuple into variadic template function's arguments? http://stackoverflow.com/questions/687490/how-do-i-expand-a-tuple-into-variadic-template-functions-arguments args... Object Function Tuple Argument Unpacking End Point This recursive template unpacks the tuple parameters into variadic.. args... Static Function Tuple Argument Unpacking End Point This recursive template unpacks the tuple parameters into variadic..
Executing cv::warpPerspective for a fake deskewing on a set of cv::Point http://stackoverflow.com/questions/7838487/executing-cvwarpperspective-for-a-fake-deskewing-on-a-set-of-cvpoint cv warpPerspective for a fake deskewing on a set of cv Point I'm trying to do a perspective transformation of a set of points.. work. This is the resulting image So there is a vector cv Point that defines the region of interest but the points are not stored.. define a RotatedRect which in turn is used to assemble cv Point2f src_vertices 4 one of the variables required by cv getPerspectiveTransform..
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection http://stackoverflow.com/questions/8667818/opencv-c-obj-c-detecting-a-sheet-of-paper-square-detection p Input Output Original image click Code double angle cv Point pt1 cv Point pt2 cv Point pt0 double dx1 pt1.x pt0.x double.. Original image click Code double angle cv Point pt1 cv Point pt2 cv Point pt0 double dx1 pt1.x pt0.x double dy1 pt1.y pt0.y.. image click Code double angle cv Point pt1 cv Point pt2 cv Point pt0 double dx1 pt1.x pt0.x double dy1 pt1.y pt0.y double dx2..
Rotating a point about another point (2D) http://stackoverflow.com/questions/2259476/rotating-a-point-about-another-point-2d card.width card.y card.height I would need a function like POINT rotate_point float cx float cy float angle POINT p Thanks c.. like POINT rotate_point float cx float cy float angle POINT p Thanks c algorithm share improve this question Oh that's.. cx cy then rotate it then add the point again. untested POINT rotate_point float cx float cy float angle POINT p float s sin..
Proper Trigonometry For Rotating A Point Around The Origin http://stackoverflow.com/questions/3162643/proper-trigonometry-for-rotating-a-point-around-the-origin for rotating a point If so which one is correct POINT rotate_point float cx float cy float angle POINT p float s sin.. correct POINT rotate_point float cx float cy float angle POINT p float s sin angle float c cos angle translate point back to..
http://stackoverflow.com/questions/3561613/c-using-too-much-cpu int pEnemie1 bool e1 time_t now time_t tEnemie1 vector POINT vS1Enemie1 vector POINT vS2Enemie1 vector POINT vRegularShots.. time_t now time_t tEnemie1 vector POINT vS1Enemie1 vector POINT vS2Enemie1 vector POINT vRegularShots Enemies Enemie1 VOID installising.. vector POINT vS1Enemie1 vector POINT vS2Enemie1 vector POINT vRegularShots Enemies Enemie1 VOID installising Enemie1.cEnemie1..
Creating a transparent window in C++ Win32 http://stackoverflow.com/questions/3970066/creating-a-transparent-window-in-c-win32 bm.bmWidth bm.bmHeight get the primary monitor's info POINT ptZero 0 HMONITOR hmonPrimary MonitorFromPoint ptZero MONITOR_DEFAULTTOPRIMARY.. the primary work area const RECT rcWork monitorinfo.rcWork POINT ptOrigin ptOrigin.x 0 ptOrigin.y rcWork.top rcWork.bottom rcWork.top..
window border width and height in Win32 - how do I get it? http://stackoverflow.com/questions/431470/window-border-width-and-height-in-win32-how-do-i-get-it HWND hWnd int nWidth int nHeight RECT rcClient rcWind POINT ptDiff GetClientRect hWnd rcClient GetWindowRect hWnd rcWind..
C++, Classes, Const, and strange syntax http://stackoverflow.com/questions/5656664/c-classes-const-and-strange-syntax data members in a class when it's declared const Isn't the POINT of const to make it so that you can't modify values c class..
How to initialize nested structures in C++? http://stackoverflow.com/questions/629433/how-to-initialize-nested-structures-in-c in advance for reading my post or posting an answer POINT STRUCTURE struct Point float x x coord of point float y y coord..
http://stackoverflow.com/questions/6423729/get-current-cursor-position You get the cursor position by calling GetCursorPos . POINT p if GetCursorPos p cursor position now in p.x and p.y This..
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