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c++ Programming Glossary: typicallyWhy 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 well behaved branches. So modern branch predictors will typically achieve 90 hit rates. But when faced with unpredictable branches..
http://stackoverflow.com/questions/1265039/using-std-namespace count error identifier count is ambiguous The error is typically long and unfriendly because std count is a template with some..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code architectures feature complex memory hierarchies registers typically several levels of cache within the CPU chip L1 L2 L3 instruction.. . In comparison reading data from the highest level cache typically takes only a handful of cycles. In modern computer architectures.. not just in the CPU. For example when you read from RAM typically a larger chunk of memory is fetched than what was specifically..
C++ - What should go into an .h file? http://stackoverflow.com/questions/1945846/c-what-should-go-into-an-h-file class declarations function prototypes and enumerations typically go in header files. In a word definitions . Code files .cpp..
Is there a max array length limit in C++? http://stackoverflow.com/questions/216259/is-there-a-max-array-length-limit-in-c memory is full. For example a vector int of a given size n typically takes about four times as much memory as an array of type vector..
C++ Timer function to provide time in nano seconds http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds QueryPerformanceCounter and QueryPerformanceFrequency typically adjust for multiple processors bugs in the BIOS or drivers may..
What do 'statically linked' and 'dynamically linked' mean? http://stackoverflow.com/questions/311882/what-do-statically-linked-and-dynamically-linked-mean together at link time by the developers . Since the user typically cannot re link the executable they're stuck with the behaviour..
Why does C++ compilation take so long? http://stackoverflow.com/questions/318398/why-does-c-compilation-take-so-long headers to be 1 loaded and 2 compiled. Every one of them typically has to be recompiled for every compilation unit because the.. for every compilation unit. In plain C code a header typically only contains forward declarations but very little actual code...
When and why will an OS initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete? http://stackoverflow.com/questions/370195/when-and-why-will-an-os-initialise-memory-to-0xcd-0xdd-etc-on-malloc-free-new Atypical values i.e. not too often are good since they typically cause early detection in code. For the case of no man's land..
Why do I get “unresolved external symbol” errors when using templates? http://stackoverflow.com/questions/456713/why-do-i-get-unresolved-external-symbol-errors-when-using-templates and functions are not instantiated until they are used typically in a separate .cpp file e.g. the program source . When the template..
What C++ Smart Pointer Implementations are available? http://stackoverflow.com/questions/5026197/what-c-smart-pointer-implementations-are-available much or how little smartness you want. intrusive_ptr is typically more efficient than shared_ptr since it allows you to have a..
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 FName array overhead The tttt area is overhead there will typically be more of this for various types of runtimes and languages.. is just a variable holding a memory address. You can typically ask the programming language to give you its number but most..
“using namespace” in c++ headers http://stackoverflow.com/questions/5849457/using-namespace-in-c-headers namespace which is another reason it's so dangerous. I typically just use grep or the like to make sure that using namespace..
Sleep less than one millisecond http://stackoverflow.com/questions/85122/sleep-less-than-one-millisecond than one millisecond On Windows you have a problem you typically never encounter on Unix. That is how to get a thread to sleep.. thread to sleep for less than one millisecond. On Unix you typically have a number of choices sleep usleep and nanosleep to fit your..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python chunks. This reduces the number of system calls which are typically relatively expensive. However since the FILE based stdio and..
Global memory management in C++ in stack or heap? http://stackoverflow.com/questions/1169858/global-memory-management-in-c-in-stack-or-heap learn more than just a simple yes no answer here you go. Typically a process has 5 different areas of memory allocated Code text..
Does the compiler decide when to inline my functions (in C++)? http://stackoverflow.com/questions/1204975/does-the-compiler-decide-when-to-inline-my-functions-in-c is at the end of the day entirely up to the compiler. Typically the more complex a function is in terms of flow the less likely..
http://stackoverflow.com/questions/1604968/what-does-this-c-code-mean y creates an 8 bit value one bit for a and 7 bits for b . Typically used in C to access compressed values such as a 4 bit nybble..
Copy constructor and = operator overload in C++: is a common function possible? http://stackoverflow.com/questions/1734628/copy-constructor-and-operator-overload-in-c-is-a-common-function-possible uses the copy constructor and assignment operator itself. Typically a memberwise swap is used. std swap works and is 'no throw'..
Function Pointers in Objective C http://stackoverflow.com/questions/1777486/function-pointers-in-objective-c c function pointers share improve this question Typically you need two pieces of information to call back into Objective..
Good hash function for a 2d index http://stackoverflow.com/questions/2634690/good-hash-function-for-a-2d-index . So I want to have an unordered_set of Point s. Typically this set might contain for example every point on a 80x24 terminal..
http://stackoverflow.com/questions/2848087/how-to-clear-stringstream it work c stringstream share improve this question Typically to 'reset' a stringstream you need to both reset the underlying.. eof flags with clear . parser.str std string parser.clear Typically what happens is that the first reaches the end of the string..
C++ templates declare in .h, define in .hpp http://stackoverflow.com/questions/3526299/c-templates-declare-in-h-define-in-hpp .cpp . c templates header share improve this question Typically in my experience YMMV an hpp file is an #include ed CPP file...
How can I wrap std::wstring in boost::asio::buffer? http://stackoverflow.com/questions/3599638/how-can-i-wrap-stdwstring-in-boostasiobuffer c serialization boost asio share improve this question Typically I use boost asio streambuf for serializing structures. Message.h..
How expensive is it to dereference a pointer in C++? http://stackoverflow.com/questions/431469/how-expensive-is-it-to-dereference-a-pointer-in-c access whether or not the object is a local object or not. Typically only very small objects are optimized to live only in registers...
C++ Returning reference to local variable http://stackoverflow.com/questions/4643713/c-returning-reference-to-local-variable int p func2 pointee still exists delete p get rid of it Typically you would wrap the pointer in some RAII class and or a factory..
http://stackoverflow.com/questions/4776355/does-wpf-work-with-c for practical purposes WPF doesn't really work with C . Typically the user interface layer is written in C# or VB.NET then calls..
Performance of built-in types : char vs short vs int vs. float vs. double http://stackoverflow.com/questions/5069489/performance-of-built-in-types-char-vs-short-vs-int-vs-float-vs-double doesn't matter to you. Different size integer types Typically CPUs are fastest at operating on integers of their native word..
“using namespace” in c++ headers http://stackoverflow.com/questions/5849457/using-namespace-in-c-headers that aren't aware of the negative consequences. Typically just a little education about the risks takes care of any issues..
Callback functions in C/C++/C# [closed] http://stackoverflow.com/questions/6183847/callback-functions-in-c-c-c does wish to be intimated of the outcome of the operation. Typically Callback functions help implement such an asynchronous mechanism..
Returning Large Objects in Functions http://stackoverflow.com/questions/753312/returning-large-objects-in-functions easier to read but I am afraid it is less efficient. Edit Typically I am thinking of cases LargeObj to be generic container classes..
Why are strings immutable in many programming languages? [duplicate] http://stackoverflow.com/questions/9544182/why-are-strings-immutable-in-many-programming-languages more expensive because you need to construct new objects. Typically the cost is O n m for concatenating two immutable Strings though..
What is a variable's linkage and storage specifier? http://stackoverflow.com/questions/95890/what-is-a-variables-linkage-and-storage-specifier This variable is only visible where it was declared. Typically applies to variables declared in a function. internal linkage..
Under what circumstances is it advantageous to give an implementation of a pure virtual function? http://stackoverflow.com/questions/977543/under-what-circumstances-is-it-advantageous-to-give-an-implementation-of-a-pure void Derived f Base f Other Derived specific functionality Typically you make a destructor virtual if you need to make a class abstract..
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