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c++ Programming Glossary: doWhat 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 reference unresolved external symbol error and how do I fix it What are undefined reference unresolved external symbol.. assumes that that symbol was defined somewhere but it doesn't yet care where. The linking phase is responsible for finding..
What are the rules about using an underscore in a C++ identifier? http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier letter identifiers containing adjacent underscores or double underscore Reserved in the global namespaces identifiers.. reserved to the implementation Each name that contains a double underscore _ _ or begins with an underscore followed by.. your own purposes right now might not cause a problem they do raise the possibility of conflict with future versions of the..
http://stackoverflow.com/questions/236129/how-to-split-a-string-in-c string using namespace std int main string s Somewhere down the road istringstream iss s do string sub iss sub cout Substring.. main string s Somewhere down the road istringstream iss s do string sub iss sub cout Substring sub endl while iss c split..
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 see it. There is no educated guesswork required. If you do have a guess as to what the problem is this will prove or disprove.. true if they sample the entire call stack. Call graphs don't give you the same information because 1 they don't summarize.. graphs don't give you the same information because 1 they don't summarize at the instruction level and 2 they give confusing..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three is The Rule of Three What does copying an object mean What are the copy constructor and the.. the copy constructor and the copy assignment operator When do I need to declare them myself How can I prevent my objects from.. a member initializer list . Special member functions What does it mean to copy a person object The main function shows two..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points on meta that started all this would be the place to do that. Answers to that question are monitored in the C chatroom.. to behaving during translation or program execution in a documented manner characteristic of the environment with or with.. at most once by the evaluation of an expression. What does it mean Informally it means that between two sequence points..
http://stackoverflow.com/questions/4421706/operator-overloading on meta that started all this would be the place to do that. Answers to that question are monitored in the C chatroom.. are merely syntactic sugar their actual work could be done by and often is forwarded to plain functions. But it is important.. them is this inline bool operator const X lhs const X rhs do actual comparison inline bool operator const X lhs const X rhs..
Why can templates only be implemented in the header file? http://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file For example template typename T struct Foo T bar void doSomething T param do stuff using T somewhere in a .cpp Foo int.. typename T struct Foo T bar void doSomething T param do stuff using T somewhere in a .cpp Foo int f When reading this.. is equivalent to the following struct FooInt int bar void doSomething int param do stuff using int Consequently the compiler..
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 and why do I have to put the &ldquo template&rdquo and &ldquo typename&rdquo.. &ldquo typename&rdquo keywords In templates where and why do I have to put typename and template on dependent names What.. they have destructors etc. I implemented this as a Russian doll i.e. Union T1 T2 T3 derives from UnionNode T1 UnionNode T2..
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 You steal the key A week later you return to the hotel do not check in sneak into your old room with your stolen key and.. wardrobe. The entire hotel could be just about to be torn down and replaced with a football stadium and you are going to.. to die in an explosion while you are sneaking around. You don't know what is going to happen when you checked out of the..
Do-While and if-else statements in C/C++ macros http://stackoverflow.com/questions/154136/do-while-and-if-else-statements-in-c-c-macros While and if else statements in C C macros In many C C macros..
http://stackoverflow.com/questions/162941/why-use-pointers Why use pointers over normal variables Short answer is Don't. Pointers are to be used where you can't use anything else... xx 4 'o' xx 5 ' 0' printf String s at address d n xx xx Do note that you can still use the variable x after you have performed..
How to pass objects to functions in C++? http://stackoverflow.com/questions/2139224/how-to-pass-objects-to-functions-in-c I need guidance on how to pass objects to functions in C . Do I need to pass pointers references or non pointer and non reference..
Read whole ASCII file into C++ std::string http://stackoverflow.com/questions/2602013/read-whole-ascii-file-into-c-stdstring whole file into the buffer t.close close file handle ... Do stuff with buffer here ... Now I want to do the exact same thing.. STL idioms well is actually surprisingly inefficient Don't do this with large files. See http insanecoding.blogspot.com..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c code might look something like this File file path to file Do stuff with file file.close In other words we must make sure.. using a finally clause try File file new File path to file Do stuff with file finally file.close C solves both problems using.. our code now looks something like File file path to file Do stuff with file No need to close it destructor will do that..
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special into your object the object will hold its original value. Do note that there is no such guarantee for objects of non POD..
When to use virtual destructors? http://stackoverflow.com/questions/461203/when-to-use-virtual-destructors some virtual methods class Derived public Base ~Derived Do some important cleanup Here you'll notice that I didn't declare..
How to convert a number to string and vice versa in C++ http://stackoverflow.com/questions/5290089/how-to-convert-a-number-to-string-and-vice-versa-in-c question How to convert a number to a string in C 03 Do not use the itoa or itof functions because they are non standard.. string streams in exactly the same manner as with cout Do not confuse std ostringstream with std ostrstream . The latter..
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 the parentheses after the type name make a difference with new..
WChars, Encodings, Standards and Portability http://stackoverflow.com/questions/6300804/wchars-encodings-standards-and-portability free to tell me to go away. The question here is basically Do I understand the C standard correctly and is this the right..
Singleton: How should it be used http://stackoverflow.com/questions/86582/singleton-how-should-it-be-used need to have one and only one object of a type in system Do not use a Singleton if If you want to save memory If you want..
What is the difference between char a[] = “string”; and char *p = “string”; http://stackoverflow.com/questions/9460260/what-is-the-difference-between-char-a-string-and-char-p-string when users search using google or otherwise. Please Do not modify the title again As the heading says What is the difference..
How to render offscreen on OpenGL? [duplicate] http://stackoverflow.com/questions/12157646/how-to-render-offscreen-on-opengl 0 instead of a pointer it is now an offset in the buffer. DO SOME OTHER STUFF otherwise this is a waste of your time glBindBuffer..
http://stackoverflow.com/questions/14932315/how-to-compile-qt-5-under-windows-or-linux-32-or-64-bit-static-or-dynamic-on-v can be found in C Qt Qt5.2 qtbase . 7 Only for Windows DO YOU REALLY WANT IT TOTALLY STATIC Usually even if you choose.. choose the appropriate compiler FOR VISUAL STUDIO EXPRESS DO NOT SELECT amd64 FOR 64 BIT IT WON'T WORK CHOOSE x86_amd64 INSTEAD..
Get the first column of a matrix represented by a vector of vectors http://stackoverflow.com/questions/15778377/get-the-first-column-of-a-matrix-represented-by-a-vector-of-vectors structure for linear algebra type operation. I actually DO need a vector of vectors or a data structure from which you..
Downloading and integrating Qt5 with Visual Studio 2012 http://stackoverflow.com/questions/15826893/downloading-and-integrating-qt5-with-visual-studio-2012 prompt is fine you don't need VS command prompt yet DO NOT use SmartGit at this or the next stage see comments below.. 64 bit mode depending on which mode you're building Qt in DO NOT build in the other bitness because ICU will overwrite the.. line but can use the user interface directly. WARNING DO NOT DOWNLOAD THE OPTIONAL qlalr SUBMODULE as it will not build..
How can I create a thread-safe singleton pattern in Windows? http://stackoverflow.com/questions/164496/how-can-i-create-a-thread-safe-singleton-pattern-in-windows check will prevent locking for just reading the pointer. DO NOT use this on just any compiler as it's not portable. The..
http://stackoverflow.com/questions/1982595/boost-asio-io-service-run or until the io_service has been stopped Notice that you DO install a handler named handle_accept that reinstalls itself..
How to select the version of the VC 2008 DLLs the application should be linked to? http://stackoverflow.com/questions/2289593/how-to-select-the-version-of-the-vc-2008-dlls-the-application-should-be-linked-t the SP1 runtime will load the SP1 runtime. If you actually DO want to use the RTM runtime even when the SP1 runtime and policy..
The best cross platform (portable) arbitrary precision math library http://stackoverflow.com/questions/2568446/the-best-cross-platform-portable-arbitrary-precision-math-library W. Jones is an example of a good article. Any help. Please DO NOT answer this question if you think using a double or a long..
Is there a way to use pre-compiled headers in VC++ without requiring stdafx.h? http://stackoverflow.com/questions/290034/is-there-a-way-to-use-pre-compiled-headers-in-vc-without-requiring-stdafx-h enables you to easily set up build configurations that DO use precompiled headers and also build configurations that do..
How do I install and build against OpenSSL 1.0.0 on Ubuntu? http://stackoverflow.com/questions/3153114/how-do-i-install-and-build-against-openssl-1-0-0-on-ubuntu test I usr local ssl include L usr local ssl lib lssl EDIT DO NOT overwrite any system libraries. It's best to keep new libs..
Finding C++ static initialization order problems http://stackoverflow.com/questions/335369/finding-c-static-initialization-order-problems once even in the presence of threads. Please note DO NOT use the double checked locking pattern to try an optimize..
How to compile dynamic library for a JNI application on linux? http://stackoverflow.com/questions/3950635/how-to-compile-dynamic-library-for-a-jni-application-on-linux jni Hello I've obtained Hello.class and Hello.h . Hello.h DO NOT EDIT THIS FILE it is machine generated #include jni.h Header..
Where can I get a “useful” C++ binary search algorithm? http://stackoverflow.com/questions/446296/where-can-i-get-a-useful-c-binary-search-algorithm or policies. Ok as first mentioned by vividos they DO require sorted data which means they ARE binary searches so..
Relative Paths Not Working in Xcode C++ http://stackoverflow.com/questions/516200/relative-paths-not-working-in-xcode-c Xcode template that I downloaded where the relative paths DO work however I have not been able to figure out why nor replicate..
Why do i need double layer of indirection for macros? http://stackoverflow.com/questions/8231966/why-do-i-need-double-layer-of-indirection-for-macros you want the double layer indirection and sometime you DO NOT want the macros expanded first int which case you CAN'T..
How can I detect file accesses in Linux? http://stackoverflow.com/questions/880263/how-can-i-detect-file-accesses-in-linux 0000000000000080 GLIBC_2.2.5 open64 0000000000370c10 g DO .bss 0000000000000008 GLIBC_PRIVATE _dl_open_hook 0000000000031680..
Where do “pure virtual function call” crashes come from? http://stackoverflow.com/questions/99552/where-do-pure-virtual-function-call-crashes-come-from function doesn't exist. class Base public Base doIt DON'T DO THIS virtual void doIt 0 class Derived public Base void.. function doesn't exist. class Base public Base doIt DON'T DO THIS virtual void doIt 0 class Derived public Base void doIt..
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