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c++ Programming Glossary: doesWhy is “using namespace std;” considered bad practice? http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice the same name as a function in std namespace that much Or does this impact program performance noticeably as you get into writing..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom is this idiom and when should it be used Which problems does it solve Does the idiom change when C 11 is used Although it's.. and providing a strong exception guarantee . How does it work Conceptually it works by using the copy constructor's.. all three problems are elegantly tackled at once. Why does it work We first notice an important choice the parameter argument..
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 probable cost of I . If the amount of data is small it doesn't tell us accurately what the cost is only that it is big enough.. flip a coin 2 times and it comes up heads both times what does that tell you about the probable weighting of the coin The respected.. that we see I more than once. If we only see it once that doesn't tell us much except that f 0. So even a very small number..
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.. a member initializer list . Special member functions What does it mean to copy a person object The main function shows two.. member functions for some class types when the program does not explicitly declare them. The implementation will implicitly..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points at most once by the evaluation of an expression. What does it mean Informally it means that between two sequence points.. be accessed only to determine the value to be stored. What does it mean It means if an object is written to within a full expression..
http://stackoverflow.com/questions/4421706/operator-overloading is implemented in terms of prefix. Also note that postfix does an extra copy. 2 2 Also note that the postfix variant does more.. does an extra copy. 2 2 Also note that the postfix variant does more work and is therefore less efficient to use than the prefix..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c C 98 and std array T n since C 11 so the need for arrays does not arise quite as often as it does in C. However when you read.. so the need for arrays does not arise quite as often as it does in C. However when you read legacy code or interact with a library.. is not a pointer One important context in which an array does not decay into a pointer to its first element is when the operator..
Why is iostream::eof inside a loop condition considered wrong? http://stackoverflow.com/questions/5605125/why-is-iostreameof-inside-a-loop-condition-considered-wrong will only be set after reading the end of the stream. It does not indicate that the next read will be the end of the stream...
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 the stack back out of your method as the original poster does here that's just a pointer to the middle of some entirely valid.. a stack for storage of locals it could use the heap. It doesn't because that would make the program slower. An implementation.. to zero everything in the room that you just vacated. It doesn't because again that would be expensive. An implementation..
http://stackoverflow.com/questions/1120140/csv-parser-in-c try it. Is it overkill bloated or is it fast and efficient Does anyone have faster algorithms using STL or anything else Thanks..
How come a non-const reference cannot bind to a temporary object? http://stackoverflow.com/questions/1565600/how-come-a-non-const-reference-cannot-bind-to-a-temporary-object non const references though . My additional question . Does following assignment extend the lifetime of temporary object..
Most effective way for float and double comparison http://stackoverflow.com/questions/17333/most-effective-way-for-float-and-double-comparison diff EPSILON diff EPSILON Seems to waste processing. Does anyone know a smarter float comparer c algorithm optimization..
When should I write the keyword 'inline' for a function/method? http://stackoverflow.com/questions/1759300/when-should-i-write-the-keyword-inline-for-a-function-method compiler not know when to make a function method 'inline' Does it matter if an application is multithreaded when one writes.. noinline and in visual studio use __declspec noinline . Does it matter if an application is multithreaded when one writes..
http://stackoverflow.com/questions/1761626/weighted-random-numbers up 2 56 chance to be picked up 3 4 chance to be picked up Does Boost have some sort of functionality for this c boost random..
In what cases do I use malloc vs new? http://stackoverflow.com/questions/184537/in-what-cases-do-i-use-malloc-vs-new in this question are invalid. int p_scalar new int 5 Does not create 5 elements but initializes to 5 int p_array new int..
Is there a simple script to convert C++ enum to string? http://stackoverflow.com/questions/201593/is-there-a-simple-script-to-convert-c-enum-to-string is really with typedefed enums and unnamed C style enums. Does anybody know something for this EDIT The solution should not..
Is there a max array length limit in C++? http://stackoverflow.com/questions/216259/is-there-a-max-array-length-limit-in-c a C limit or does it depend on my machine Is it tweakable Does it depend on the type the array is made of Can I break that..
When does invoking a member function on a null instance result in undefined behavior? http://stackoverflow.com/questions/2474018/when-does-invoking-a-member-function-on-a-null-instance-result-in-undefined-beha null is always said to be undefined behavior. Does a result in undefined behavior What about if both functions..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom and when should it be used Which problems does it solve Does the idiom change when C 11 is used Although it's been mentioned..
Why are C character literals ints instead of chars? http://stackoverflow.com/questions/433895/why-are-c-character-literals-ints-instead-of-chars appears that C character literals are actually integers. Does anyone know why I can find plenty of mentions of this C quirk..
How does the Comma Operator work http://stackoverflow.com/questions/54142/how-does-the-comma-operator-work the comma operator work in C For instance if I do a b c Does a end up equaling b or c Yes I know this is easy to test just..
Vim and Ctags tips and tricks [closed] http://stackoverflow.com/questions/563616/vim-and-ctags-tips-and-tricks with Ctags EDIT2 What version of gVim you use with tags Does it make a difference EDIT3 How do you enhance your programming..
Is short-circuiting boolean operators mandated in C/C++? And evaluation order? http://stackoverflow.com/questions/628526/is-short-circuiting-boolean-operators-mandated-in-c-c-and-evaluation-order boolean operators mandated in C C And evaluation order Does the ANSI standard mandate logic operators to be short circuited.. has freedom in selecting the most efficient order. Does the standard indicate the evaluation order of this expression..
How do I expand a tuple into variadic template function's arguments? http://stackoverflow.com/questions/687490/how-do-i-expand-a-tuple-into-variadic-template-functions-arguments arguments is to be able to use them in cases like above. Does anyone have a solution to is or hint on where to read about..
Executing cv::warpPerspective for a fake deskewing on a set of cv::Point http://stackoverflow.com/questions/7838487/executing-cvwarpperspective-for-a-fake-deskewing-on-a-set-of-cvpoint .y box.size.width x box.size.height std endl Does the order of the points matter I assume they do NOT. But if.. x box.size.height std endl Point2f pts 4 box.points pts Does the order of the points matter I assume they do NOT. But if..
Example for boost shared_mutex (multiple reads/one write)? http://stackoverflow.com/questions/989795/example-for-boost-shared-mutex-multiple-reads-one-write clear on how to use it and haven't found a clear example. Does anyone have a simple example I could use to get started c multithreading..
Is there a preprocessor directive for detecting C++11x support? http://stackoverflow.com/questions/10717502/is-there-a-preprocessor-directive-for-detecting-c11x-support thing to do especially since the gcc compiler in MacPorts DOES support c 11x. Is there a #define C11X_SUPPORTED type macro..
error LNK1169: one or more multiply defined symbols found http://stackoverflow.com/questions/12132453/error-lnk1169-one-or-more-multiply-defined-symbols-found question Chances are that your SilverLines.h actually DOES define something instead of just declaring it. I'm not going..
http://stackoverflow.com/questions/1260591/about-mysql-gpl-and-lgpl worrying about the source code not being GPL. But MySQL DOES link against libmysqlclient _r . a so http tangentsoft.net mysql..
Unable to catch c++ exception using catch (…) http://stackoverflow.com/questions/1373686/unable-to-catch-c-exception-using-catch version of the third party library the exact same code DOES catch the exception and the code to log the exception DOES execute... DOES catch the exception and the code to log the exception DOES execute. I verified this within VS watching the same conditions..
Why define operator + or += outside a class, and how to do it properly? http://stackoverflow.com/questions/4652932/why-define-operator-or-outside-a-class-and-how-to-do-it-properly of int 2 to Type But you could NOT write Type c 1 Type 2 DOES NOT COMPILE Having operator as a free function allows the last..
When to use C++ private inheritance over composition? http://stackoverflow.com/questions/6297331/when-to-use-c-private-inheritance-over-composition which I slightly prefer but the inheritance method DOES allow you to use using to expose some parent methods publicly..
Boost Static Assertion for Type Comparision http://stackoverflow.com/questions/6642050/boost-static-assertion-for-type-comparision the above version.... hm... EDIT HERE A SNIPPET WHICH DOES NOT WORK IN MSVC This snipped should compile in MSVC but it..
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