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c++ Programming Glossary: actuallyWhy 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 sorted and unsorted data. In the C case the hack is actually a tad slower than with the branch when the data is sorted. A..
what is the difference between const int*, const int * const, int const * http://stackoverflow.com/questions/1143262/what-is-the-difference-between-const-int-const-int-const-int-const the meaning of const const int foo int const bar note you actually need to set the pointer here because you can't change it later..
What is an undefined reference/unresolved external symbol error and how do I fix it? http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix finding the symbol and correctly linking it to b.cpp well actually to the object or library that uses it . If you're using MSVS..
What is the difference between a definition and a declaration? http://stackoverflow.com/questions/1410563/what-is-the-difference-between-a-definition-and-a-declaration foo no extern allowed for class declarations A definition actually instantiates implements this identifier. It's what the linker..
Most vexing parse: why doesn't A a(()); work? http://stackoverflow.com/questions/1424510/most-vexing-parse-why-doesnt-a-a-work a temporary B object as a constructor parameter it's actually a declaration of a function a returning an A taking a pointer..
http://stackoverflow.com/questions/3106110/what-is-move-semantics C 0x . Most of the new features made sense to me and I am actually excited about C 0x now with the exception of one. I still don't..
When should static_cast, dynamic_cast and reinterpret_cast be used? http://stackoverflow.com/questions/332030/when-should-static-cast-dynamic-cast-and-reinterpret-cast-be-used to static_cast down a hierarchy to a type that isn't actually the type of the object. const_cast can be used to remove or..
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 They will also say it only works on toy programs when actually it works on any program and it seems to work better on bigger..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three contexts and we should understand what copying an object actually means. Let us consider a simple example class person std string..
http://stackoverflow.com/questions/4421706/operator-overloading thing to note here is that only two of these operators actually do anything the others are just forwarding their arguments to..
Pretty-print C++ STL containers http://stackoverflow.com/questions/4850473/pretty-print-c-stl-containers std Pre declarations of container types so we don't actually have to include the relevant headers if not needed speeding.. std Pre declarations of container types so we don't actually have to include the relevant headers if not needed speeding.. up compilation time. These aren't necessary if you do actually include the headers. template typename T typename TAllocator..
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 the same manner unless you can explicitly detect that it's actually just one house. Note This is usually the concept that I have.. box ie. you don't really know or care about how it is actually implemented just as long as it works. share improve this answer..
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 U that should only be instantiated for types that could actually be in the union. Trying to cast a Union bool float to std string.. function 0 int main int f 0 boost function int f That's actually a valid expression It compares boost function with zero int..
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 Let's get pedantic because there are differences that can actually affect your code's behavior. Much of the following is taken..
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 previously valid stack page . Again implementations do not actually do that because it is slow and unnecessary. Instead implementations..
Why does C++ not let baseclasses implement a derived class' inherited interface? http://stackoverflow.com/questions/10464308/why-does-c-not-let-baseclasses-implement-a-derived-class-inherited-interface started on diamond inheritance or virtual inheritance yet. Actually this problem difference between subobject addresses is solved..
Is any part of C++ syntax context sensitive? [duplicate] http://stackoverflow.com/questions/1172939/is-any-part-of-c-syntax-context-sensitive Consequently an unrestricted grammar could recognize it. Actually writing such a grammar would be impractical which is why the..
“C subset of C++” -> Where not ? examples? [closed] http://stackoverflow.com/questions/1201593/c-subset-of-c-where-not-examples read in a lot of books the claim that C is a subset of C . Actually some good books say C is a subset of C except the little Details..
Splitting templated C++ classes into .hpp/.cpp files--is it possible? http://stackoverflow.com/questions/1724036/splitting-templated-c-classes-into-hpp-cpp-files-is-it-possible it needs to know the data type of the template class. Actually it must be understood that template class is not a class at..
Is there a standard sign function (signum, sgn) in C/C++? http://stackoverflow.com/questions/1903954/is-there-a-standard-sign-function-signum-sgn-in-c-c typename T int sgn T val return T 0 val val T 0 Benefits Actually implements signum 1 0 or 1 . Implementations here using copysign..
Why not to use Turbo C++? [closed] http://stackoverflow.com/questions/1961828/why-not-to-use-turbo-c Turbo C is a real real old and an ancient compiler Actually there arent any arguments as such that you can put to convince..
How to make SIMPLE C++ Makefile? http://stackoverflow.com/questions/2481269/how-to-make-simple-c-makefile them into a correct up to date version of the program. Actually you can use make for other things too but I'm not going to talk..
What happens if you call erase() on a map element while iterating from begin to end? http://stackoverflow.com/questions/263945/what-happens-if-you-call-erase-on-a-map-element-while-iterating-from-begin-to apart from iterators on the element that was deleted Actually inserting or deleting does not invalidate any of the iterators..
Is it better in C++ to pass by value or pass by constant reference? http://stackoverflow.com/questions/270408/is-it-better-in-c-to-pass-by-value-or-pass-by-constant-reference constants pass by value share improve this question Actually any modern compiler should be able to figure out when passing..
http://stackoverflow.com/questions/2958648/what-are-the-pitfalls-of-adl object and it will call print to print the object n times. Actually it turns out that if we only look at this code we have absolutely..
How do exceptions work (behind the scenes) in c++ http://stackoverflow.com/questions/307610/how-do-exceptions-work-behind-the-scenes-in-c exception. Unwind the stack until it gets to that handler. Actually call the handler. Compare that with the cost of simply returning..
http://stackoverflow.com/questions/4303513/push-back-vs-emplace-back didn't implement the right version of emplace_back in MSVC Actually it bugged me too a while ago so I asked the same question on..
Alternative virtual mechanism implementations? http://stackoverflow.com/questions/4352032/alternative-virtual-mechanism-implementations the run time type of a subobject be correct at all times. Actually there's no good reason for this during construction since constructors..
Thou shalt not inherit from std::vector http://stackoverflow.com/questions/4353203/thou-shalt-not-inherit-from-stdvector oop inheritance stl vector share improve this question Actually there is nothing wrong with public inheritance of std vector..
http://stackoverflow.com/questions/5368862/why-do-multiple-inherited-functions-with-same-name-but-different-signatures-not flawlessly because void foo float is inside C's scope. Actually d.foo 5 calls void foo float and not the int version. share..
std::vector, default construction, C++11 and breaking changes http://stackoverflow.com/questions/5759232/stdvector-default-construction-c11-and-breaking-changes at least all the elements in v share the same impl member. Actually what causes this is the vector constructor template typename..
http://stackoverflow.com/questions/7908248/in-a-templated-derived-class-why-do-i-need-to-qualify-base-class-member-names-w int d it looks like the definition of a complete type Actually until instantiation it looks more like template typename T class..
Audio output with video processing with opencv http://stackoverflow.com/questions/8187745/audio-output-with-video-processing-with-opencv pFormatCtx packet 0 if packet.stream_index videoStream Actually this is were SYNC between audio video would happen. Right now..
Checking a member exists, possibly in a base class, C++11 version http://stackoverflow.com/questions/9530928/checking-a-member-exists-possibly-in-a-base-class-c11-version programming typetraits share improve this question Actually things got much easier in C 11 thanks to the decltype and late..
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