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c++ Programming Glossary: takenWhy 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 after it switches direction. Quick visualization T branch taken N branch not taken data 0 1 2 3 4 ... 126 127 128 129 130 ..... direction. Quick visualization T branch taken N branch not taken data 0 1 2 3 4 ... 126 127 128 129 130 ... 250 251 252 ... branch..
What are copy elision and return value optimization? http://stackoverflow.com/questions/12953127/what-are-copy-elision-and-return-value-optimization moving the object has side effects . The following example taken from Wikipedia struct C C C const C std cout A copy was made...
C++ Timer function to provide time in nano seconds http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds the time it took for an API to return a value. The time taken for such an action is in the space of nano seconds. As the API..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom first notice an important choice the parameter argument is taken by value . While one could just as easily do the following and..
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 on average proportional to their cost. If n samples are taken and f is the cost then I will appear on nf sqrt nf 1 f samples...
Using arrays or std::vectors in C++, what's the performance gap? http://stackoverflow.com/questions/381621/using-arrays-or-stdvectors-in-c-whats-the-performance-gap to iterate over it. Now the std vector vs. native C arrays taken shamelessly from here http www.xs4all.nl ~weegen eelis vector..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c right time which it should be anyway closing the file is taken care of for us. So our code now looks something like File file..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points and no side effects of subsequent evaluations shall have taken place. §1.9 7 Side effects What are side effects Evaluation..
http://stackoverflow.com/questions/4421706/operator-overloading use cases for overloading these. 3 Again the lesson to be taken from this is that a b is in general more efficient than a b..
Undefined Behavior and Sequence Points Reloaded http://stackoverflow.com/questions/4638364/undefined-behavior-and-sequence-points-reloaded funny and convoluted expression the italicized phrases are taken from the above topic smile i i We say this invokes undefined.. user defined type which overloads subscript operator a i i taken from the previous topic. but here type of `i` is Index. Must..
What's this STL vs. “C++ Standard Library” fight all about? [closed] http://stackoverflow.com/questions/5205491/whats-this-stl-vs-c-standard-library-fight-all-about entire C Standard Library instead of the parts that were taken from SGI STL. ... it refers to the STL despite the fact that..
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 typename t x f . If you omit the keyword and the name is taken to be a non type but when instantiation finds it denotes a type.. often get parser errors already at definition time t x is taken as non type but as an expression the following misses an operator.. allows typename only before qualified names it is therefor taken as granted that unqualified names are always known to refer..
Do the parentheses after the type name make a difference with new? http://stackoverflow.com/questions/620137/do-the-parentheses-after-the-type-name-make-a-difference-with-new affect your code's behavior. Much of the following is taken from comments made to an Old New Thing article . Sometimes the..
What is “rvalue reference for *this”? http://stackoverflow.com/questions/8610571/what-is-rvalue-reference-for-this t 't' not an rvalue can't match 'test ' rvalue reference taken out of overload set If after all overloads in the set are tested.. ' not an lvalue can't match 'test ' lvalue reference taken out of overload set f2 test 'test ' rvalue can match 'test '..
OpenCV SURF function is not implemented http://stackoverflow.com/questions/11175794/opencv-surf-function-is-not-implemented opencv implementation surf share improve this question Taken from this answer why don't you google your question before asking..
Removing duplicates from a DoublyLinkedList C++ http://stackoverflow.com/questions/16126160/removing-duplicates-from-a-doublylinkedlist-c a node was removed. m_count query.clock2 cout nTime Taken query.time2 query.time1 n Class Declarations template class..
How to use the PI constant in C++ http://stackoverflow.com/questions/1727881/how-to-use-the-pi-constant-in-c and then M_PI is your friend. Check for more. Taken from my math. h Define _USE_MATH_DEFINES before including math.h..
http://stackoverflow.com/questions/2038200/write-a-program-that-will-print-c-if-compiled-as-an-ansi-c-program-and-c C program and &ldquo C &rdquo if compiled as a C program Taken from http www.ocf.berkeley.edu ~wwu riddles cs.shtml It looks..
Alternative to itoa() for converting integer to string C++? http://stackoverflow.com/questions/228005/alternative-to-itoa-for-converting-integer-to-string-c int i 5 std string s std stringstream out out i s out.str Taken from http notfaq.wordpress.com 2006 08 30 c convert int to string..
What is the C++ equivalent of java.lang.Object x = new Foo()? http://stackoverflow.com/questions/4233123/what-is-the-c-equivalent-of-java-lang-object-x-new-foo The Boost documents state better than I in their purpose. Taken from the introduction section of Any There are times when a..
How to redirect qDebug, qWarning, qCritical etc output? http://stackoverflow.com/questions/4954140/how-to-redirect-qdebug-qwarning-qcritical-etc-output callback QApplication app argc argv ... return app.exec Taken from the doc of qInstallMsgHandler I only added the comments..
Is Boost IPC any good? [closed] http://stackoverflow.com/questions/5140312/is-boost-ipc-any-good expect but the emulation implementation is pretty basic Taken from Boost 1.40. inline void interprocess_mutex lock void do..
http://stackoverflow.com/questions/6240894/is-there-a-reason-on-not-allowing-lambdas-to-deduce-the-return-type-if-it-contai the return type if it contains more than one statement Taken from the C 0x FDIS n3290 If a lambda expression does not include..
'foo' was not declared in this scope c++ http://stackoverflow.com/questions/6283168/foo-was-not-declared-in-this-scope-c The integral is calculated according to the midpoint rule. Taken from Core Web Programming from Prentice Hall and Sun Microsystems.. Both x and y are double precision floating point numbers. Taken from Core Web Programming from Prentice Hall and Sun Microsystems..
In which order should floats be added to get the most precise result? http://stackoverflow.com/questions/6699066/in-which-order-should-floats-be-added-to-get-the-most-precise-result add it into the next total up and start a new one. Taken to its logical extreme this process is equivalent to performing..
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