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c++ Programming Glossary: getWhat 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 although in practice different phases might be folded together. The specified errors occur during this last stage of compilation.. files into object files or libraries and now you want to get them to work together. Say you defined symbol a in a.cpp . Now.. files or libraries and now you want to get them to work together. Say you defined symbol a in a.cpp . Now b.cpp declared that..
Why is “using namespace std;” considered bad practice? http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice Or does this impact program performance noticeably as you get into writing larger applications c namespaces std c faq share..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom operator const dumb_array other if this other 1 get rid of the old data... delete mArray 2 mArray 0 2 see footnote.. operator const dumb_array other if this other 1 get the new data ready before we replace the old std size_t newSize.. our resource is the key to eliminating code duplication we get to use the code from the copy constructor to make the copy 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 the cause of performance problems and the opportunity to get speedup . Added It might not be obvious but the stack sampling.. words our prior certainty is that I is cheap. Then we get Prior P f x x P o 2 2 f x P o 2 2 f x P o 2 2 f x P f x 0.001..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three job is generally a little more complicated because the target object is already in some valid state that needs to be dealt.. what we want in this case name and age are copied so we get a self contained independent person object. The implicitly defined.. Even today people still write classes in this style and get into trouble I pushed a person into a vector and now I get crazy..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points out in the first place so your answer is very likely to get read by those who came up with the idea. c c undefined behavior.. In addition to the initialization operation the value of y gets changed due to the side effect of operator. So far so good... from daemons flying out of your nose to your girlfriend getting pregnant. What is the relation between Undefined Behaviour..
http://stackoverflow.com/questions/4421706/operator-overloading out in the first place so your answer is very likely to get read by those who came up with the idea. c operators operator.. forwarded to plain functions. But it is important that you get this boiler plate code right. If you fail either your operator.. might be reasons to break this one too. If so do not forget that the left hand operand of the binary comparison operators..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c out in the first place so your answer is very likely to get read by those who came up with the idea. c arrays pointers.. the size. If one or both of those ingredients differ you get a distinct type #include type_traits static_assert std is_same.. process since it is no longer part of the type T . Pro Forgetting the size of an array on the type level allows a pointer..
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 this is specified at 14.6.2 1 . The typename keyword Let's get back to our initial problem how can we parse t x f The answer.. it's a type or not determines parsing you will often get parser errors already at definition time t x is taken as non..
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 and go to sleep. You check out the next morning but forget to give back your key. You steal the key A week later you return.. If you illegally re enter your room with a stolen key to get it back the hotel security staff is not required to catch you.. over keys for example. UPDATE Holy goodness this answer is getting a lot of attention. I'm not sure why I considered it to..
Heap corruption under Win32; how to locate? http://stackoverflow.com/questions/1069/heap-corruption-under-win32-how-to-locate reproduce. My current best guesses as to where to next is Get an insanely grunty box to replace the current dev box 2Gb RAM..
In C++, How to get MD5 hash of a file? http://stackoverflow.com/questions/1220046/in-c-how-to-get-md5-hash-of-a-file md int i for i 0 i MD5_DIGEST_LENGTH i printf 02x md i Get the size of the file by its file descriptor unsigned long get_size_by_fd..
Get the IP Address of local computer http://stackoverflow.com/questions/122208/get-the-ip-address-of-local-computer the IP Address of local computer In C what's the easiest way..
http://stackoverflow.com/questions/1528298/get-path-of-executable path of executable I know this question has been asked before..
Get the IP address of the machine http://stackoverflow.com/questions/212528/get-the-ip-address-of-the-machine the IP address of the machine This Question is almost the same.. This Question is almost the same as the previously asked Get the IP Address of local computer Question. However I need to..
How do I calculate the week number given a date? http://stackoverflow.com/questions/274861/how-do-i-calculate-the-week-number-given-a-date would also help I'm developing in C on Windows. Related Getting week number off a date in MS SQL Server 2005 c windows.. find out first of year's day int badWeekNum julian 7 1 Get our week# wrong int weekNum julian 6 7 probably better. CHECK..
Finding C++ static initialization order problems http://stackoverflow.com/questions/335369/finding-c-static-initialization-order-problems to get rid of them eventually arn't you class A public Get the globale instance abc static A getInstance_abc return reference...
What techniques can be used to speed up C++ compilation times? http://stackoverflow.com/questions/373142/what-techniques-can-be-used-to-speed-up-c-compilation-times libraries .so or .dll you can reduce linking time as well. Get a Faster Computer More RAM faster hard drives including SSDs..
What is the bit size of long on 64-bit Windows? http://stackoverflow.com/questions/384502/what-is-the-bit-size-of-long-on-64-bit-windows the sizes of the integer data types on 64 bit machines. Get used to it the world isn't going to change. share improve this..
How to get a list of video capture devices (web cameras) on windows? (C++) http://stackoverflow.com/questions/4286223/how-to-get-a-list-of-video-capture-devices-web-cameras-on-windows-c hwnd ChooseDeviceParam pParam HRESULT hr S_OK HWND hList GetDlgItem hwnd IDC_DEVICE_LIST Display a list of the devices. for.. count i WCHAR szFriendlyName NULL hr pParam ppDevices i GetAllocatedString MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME szFriendlyName.. pMoniker Release continue VARIANT var VariantInit var Get description or friendly name. hr pPropBag Read L Description..
How do I get started in embedded programming? [closed] http://stackoverflow.com/questions/45247/how-do-i-get-started-in-embedded-programming Here are some tips to get started in embedded systems. Get a micro controller. Try starting with a demonstration board..
Calling a java method from c++ in Android http://stackoverflow.com/questions/5198105/calling-a-java-method-from-c-in-android call jclass clazz env FindClass the package MainActivity Get the method that you want to call jmethodID messageMe env GetMethodID.. the method that you want to call jmethodID messageMe env GetMethodID clazz messageMe Ljava lang String V Call the method.. object jobject result env CallObjectMethod jstr messageMe Get a C style string const char str env GetStringUTFChars jstring..
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 routines or you risk crashing the program. Allocate memory Get an entrepreneur to build your house and give you the address..
What is the performance cost of having a virtual method in a C++ class? http://stackoverflow.com/questions/667634/what-is-the-performance-cost-of-having-a-virtual-method-in-a-c-class the cost unless the function is something like a trivial Get Set accessor in which anything other than inline is kind of..
Converting Between Local Times and GMT/UTC in C/C++ http://stackoverflow.com/questions/761791/converting-between-local-times-and-gmt-utc-in-c-c than stumbling around. A possibly related question is Get Daylight Saving Transition Dates For Time Zones in C c c timezone..
Audio output with video processing with opencv http://stackoverflow.com/questions/8187745/audio-output-with-video-processing-with-opencv stderr No audio stream found in s n filename exit 1 Get a pointer to the codec context for the audio stream aCodecCtx.. wanted_spec spec 0 fprintf stderr SDL_OpenAudio s n SDL_GetError exit 1 AVCodec aCodec avcodec_find_decoder aCodecCtx codec_id.. streams index packet_queue_init audioq SDL_PauseAudio 0 Get a pointer to the codec context for the video stream pCodecCtx..
What XML parser should I use in C++? http://stackoverflow.com/questions/9387610/what-xml-parser-should-i-use-in-c TinyXPath is distributed under the zLib license. Just Get The Job Done So you don't care about XML correctness. Performance..
http://stackoverflow.com/questions/1798523/c-http-library to grab the contents of an URL the response to a POST or a GET like a web service's response to a string c http url share..
http://stackoverflow.com/questions/20636914/c-mean-median-and-mode n return 0 void mean int new_array int num GET TOTAL CALCULATE MEAN float total for int i 0 i num i total new_array..
How can I implement a RESTful webservice using C++? http://stackoverflow.com/questions/298113/how-can-i-implement-a-restful-webservice-using-c on those resources. CRUD operations map to the HTTP POST GET PUT and DELETE methods. A great book on RESTful design is RESTful..
How to send ostream via boost sockets in C++? http://stackoverflow.com/questions/5675358/how-to-send-ostream-via-boost-sockets-in-c request std ostream request_stream request request_stream GET argv 2 HTTP 1.0 r n request_stream Host argv 1 r n request_stream..
WCHAR to String, how do i do it? http://stackoverflow.com/questions/6907116/wchar-to-string-how-do-i-do-it handle. if hConnect hRequest WinHttpOpenRequest hConnect L GET NULL NULL WINHTTP_NO_REFERER WINHTTP_DEFAULT_ACCEPT_TYPES..
HTTPS request with Boost.Asio and OpenSSL http://stackoverflow.com/questions/7046370/https-request-with-boost-asio-and-openssl is the request I send std stringstream request_ request_ GET api 0 data ticker.php HTTP 1.1 r n request_ Host mtgox.com r.. CN StartCom Certification Authority Sending request GET api 0 data ticker.php HTTP 1.1 Host mtgox.com Accept Encoding..
How to download a file with WinHTTP in C/C++? http://stackoverflow.com/questions/822714/how-to-download-a-file-with-winhttp-in-c-c handle. if hConnect hRequest WinHttpOpenRequest hConnect L GET L ref multimedia podcasts.html NULL WINHTTP_NO_REFERER NULL..
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