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c++ Programming Glossary: notWhat 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 C to name member variables with some kind of prefix to denote the fact that they're member variables rather than local variables.. c faq share improve this question The rules which did not change in C 11 Reserved in any scope including for use as implementation.. with an underscore and either an uppercase letter or another underscore are always reserved for any use. All identifiers..
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 and the opportunity to get speedup . Added It might not be obvious but the stack sampling technique works equally well.. of the number of times it may occur within a sample. Another objection I often hear is It will stop someplace random and.. is only that it is big enough to be worth fixing. Yet another way to look at it is called the Rule Of Succession . If you..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three functions for some class types when the program does not explicitly declare them. The implementation will implicitly.. will implicitly define them if they are used. ... end note n3126.pdf section 12 §1 By default copying an object means.. always empty. This is also fine in this case since we did not acquire any resources in the constructor. The members' destructors..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points §1.9 16 A full expression is an expression that is not a subexpression of another expression. 1 Example int a 5 is.. is an expression that is not a subexpression of another expression. 1 Example int a 5 is a sequence point here in.. 2 a b §5.14 a b §5.15 a b c §5.16 a b 5.18 in func a a is not comma operator its merely a separator between the arguments..
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 argument in this case int . If these implementations were not in the header they wouldn't be accessible and therefore the.. from declaration but is accessible to the compiler. Another solution is to keep the implementation separated and explicitly..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom to define the assignment operator in terms of itself Not only that but unqualified calls to swap will use our custom.. this We lose an important optimization opportunity . Not only that but this choice is critical in C 11 which is discussed.. no code we cannot introduce bugs within the operator. Note that this means we are rid of the need for a self assignment..
What are all the common undefined behaviour that a C++ programmer should know about? [closed] http://stackoverflow.com/questions/367633/what-are-all-the-common-undefined-behaviour-that-a-c-programmer-should-know-ab string literal during preprocessing Function and Template Not returning a value from a value returning function directly or..
What are access specifiers? Should I inherit with private, protected or public? http://stackoverflow.com/questions/5447498/what-are-access-specifiers-should-i-inherit-with-private-protected-or-public int c int main MyClass obj obj.a 10 Allowed obj.b 20 Not Allowed gives compiler error obj.c 30 Not Allowed gives compiler.. Allowed obj.b 20 Not Allowed gives compiler error obj.c 30 Not Allowed gives compiler error Inheritance and Access Specifiers.. Base void doSomething a 10 Allowed b 20 Allowed c 30 Not Allowed Compiler Error int main Derived obj obj.a 10 Allowed..
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 not caught by this general rule. Dependent function names Not primarily a concern of this article but still worth mentioning.. not because it might look obvious to a human reader. Not so for the compiler. Imagine the following arbitrary definition..
Singleton: How should it be used http://stackoverflow.com/questions/86582/singleton-how-should-it-be-used of copy the object MySingleton MySingleton const copy Not Implemented MySingleton operator MySingleton const copy Not.. Implemented MySingleton operator MySingleton const copy Not Implemented public static MySingleton getInstance The only..
What is the difference between new/delete and malloc/free? http://stackoverflow.com/questions/240212/what-is-the-difference-between-new-delete-and-malloc-free memory simple No copy constructor to worry about They will NOT call new delete No way to splice user code into the allocation.. sequence to help with low memory. malloc free can NOT be overridden legally Technically memory allocated by new comes..
how do I validate user input as a double in C++? http://stackoverflow.com/questions/3273993/how-do-i-validate-user-input-as-a-double-in-c if it is legitimate... if its a double go on... if it is NOT a double prompt again. Any ideas c validation double cin ..
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 away..
http://stackoverflow.com/questions/402283/stdwstring-vs-stdstring ASCII is supposed to go from 0 to 127. Higher chars are NOT ASCII. a char from 0 to 127 will be held correctly a char from..
Superiority of unnamed namespace over static? http://stackoverflow.com/questions/4422507/superiority-of-unnamed-namespace-over-static function body static int sample_variale But this code is NOT valid illegal code static class sample_class class body static..
C++ : Catch a divide by zero error http://stackoverflow.com/questions/4747934/c-catch-a-divide-by-zero-error a null pointer dereference... but unlike exceptions that's NOT a way to control your program's flow even in exceptional cases...
Is main() really start of a C++ program? http://stackoverflow.com/questions/4783404/is-main-really-start-of-a-c-program the quoted statement 3.6.1 1 from the Standard as main is NOT the start of the program it is in fact the end of this program..
How do you set, clear and toggle a single bit in C/C++? http://stackoverflow.com/questions/47981/how-do-you-set-clear-and-toggle-a-single-bit-in-c-c bit x . You must invert the bit string with the bitwise NOT operator ~ then AND it. Toggling a bit The XOR operator ^ can..
How to build Qt for Visual Studio 2010 http://stackoverflow.com/questions/5601950/how-to-build-qt-for-visual-studio-2010 that I stupidly didn ™t realize was the fact that you CANNOT use the Visual Studio 2008 compiled libraries and dll ™s available.. needs the Visual C 2008 Debug Runtime installed which is NOT available as a redistributable installer. The only way to install..
“using namespace” in c++ headers http://stackoverflow.com/questions/5849457/using-namespace-in-c-headers share improve this question You should definitely NOT use using namespace in headers for precisely the reason you..
Proper stack and heap usage in C++? http://stackoverflow.com/questions/599308/proper-stack-and-heap-usage-in-c to must remember to delete it return pointerToC this is NOT SAFE B lives on the stack and will be deleted when foo returns...
C++, template argument can not be deduced http://stackoverflow.com/questions/6060824/c-template-argument-can-not-be-deduced TMap SomeType Type is std map double double It cannot. Its NOT guaranteed that the type which you use in std map is also the..
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 12 . In C there is an extra trap short circuiting does NOT apply to types that overload operators and . Footnote 12 The..
When should I use C++ private inheritance? http://stackoverflow.com/questions/656224/when-should-i-use-c-private-inheritance this question Note after answer acceptance This is NOT a complete answer. Read other answers like here conceptually..
http://stackoverflow.com/questions/712639/understanding-the-meaning-of-the-term-and-the-concept-raii-resource-acquisiti is because it might have been moved see below . It is NOT needed to check against a failed constructor because the destructor..
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 endl Does the order of the points matter I assume they do NOT. But if it does is there an easy way to identify and order them.. pts Does the order of the points matter I assume they do NOT. But if it does is there an easy way to identify and order them..
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 learned that scanf and gets are both UNSAFE and should NOT BE USED due to potential of buffer overflow. So I wrote this..
Smart Pointers: Or who owns you baby? [closed] http://stackoverflow.com/questions/94227/smart-pointers-or-who-owns-you-baby T Single person owns the object. Transfer of ownership is NOT allowed. Usage Used to show explicit ownership. Object will..
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