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c++ Programming Glossary: onceWhat is the difference between a definition and a declaration? http://stackoverflow.com/questions/1410563/what-is-the-difference-between-a-definition-and-a-declaration double f int double However it must be defined exactly once. If you forget to define something that's been declared and.. about a missing symbols. If you define something more than once then the linker doesn't know which of the definitions to link..
Best way to detect integer overflow in C/C++ http://stackoverflow.com/questions/199333/best-way-to-detect-integer-overflow-in-c-c c where a b and c together use all the digits 0 9 exactly once. The program looped over values of a and b and ran a digit counting..
What should main() return in C and C++? http://stackoverflow.com/questions/204476/what-should-main-return-in-c-and-c with the main function. It can only be entered and left once marking program start and termination according to the C standard...
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior behavior. Basically the standard allows anything to happen once you invoke undefined behavior even nasal demons . It does not..
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 is it's evaluated just as if it were non static and we once again dereference a null pointer with E1 .E2 . However because..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom providing a strong exception guarantee . How does it work Conceptually it works by using the copy constructor's functionality.. manages more than one While this may seem to be a valid concern and indeed it requires non trivial try catch clauses this.. one fell swoop all three problems are elegantly tackled at once. Why does it work We first notice an important choice the parameter..
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 miss the real problem . This comes from having a prior concept of what the real problem is. A key property of performance.. of tries 2 2 1 2 2 75 . The key is that we see I more than once. If we only see it once that doesn't tell us much except that.. The key is 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..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c In other words we must make sure that we close the file once we've finished with it. This has two drawbacks firstly wherever.. to str but str was created on the stack so we be deleted once we exit foo . In other words by the time the caller gets the.. We could just say that the caller must delete the object once he's finished with it. The downside is that the caller has to..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points scalar object shall have its stored value modified at most once by the evaluation of an expression. What does it mean Informally.. sequence points a variable must not be modified more than once. In an expression statement the next sequence point is usually.. invoke Undefined Behaviour. i i i is modified more than once i i same as above i 2 same as above i i 1 same as above i parsed..
Pretty-print C++ STL containers http://stackoverflow.com/questions/4850473/pretty-print-c-stl-containers this library I would like to have a single template that once and for all takes care of pretty printing all STL containers..
OpenCV 2.3 C++ Visual Studio 2010 http://stackoverflow.com/questions/7011238/opencv-2-3-c-visual-studio-2010 and libraries. Go to the Project Properties ALT F7 and once the new window shows up do the following On the Configuration..
Algorithm improvement for Coca-Cola can shape recognition http://stackoverflow.com/questions/10168686/algorithm-improvement-for-coca-cola-can-shape-recognition the center and will see a peak in the heat map as below. Once you have that a simple threshold based heuristic can give you..
OpenCV C++/Obj-C: Advanced square detection http://stackoverflow.com/questions/10533233/opencv-c-obj-c-advanced-square-detection should help to determine the inliers vs. outliers. Once you've located candidate corners you can also filter these candidates..
When can outer braces be omitted in an initializer list? http://stackoverflow.com/questions/11734861/when-can-outer-braces-be-omitted-in-an-initializer-list that initialization of `data` ends which compiles fine . Once again the extra braces is needed because you're initializing..
http://stackoverflow.com/questions/145270/calling-c-c-from-python self.obj lib.Foo_new def bar self lib.Foo_bar self.obj Once you have that you can call it like f Foo f.bar #and you will..
Why aren't my include guards preventing recursive inclusion and multiple symbol definitions? http://stackoverflow.com/questions/14909997/why-arent-my-include-guards-preventing-recursive-inclusion-and-multiple-symbol input to the compiler for translating it into object code. Once the compiler is done with producing the object code for one..
Why does C++ compilation take so long? http://stackoverflow.com/questions/318398/why-does-c-compilation-take-so-long once for every compilation unit that includes it Linking Once compiled all the object files have to be linked together. This..
Windows threading: _beginthread vs _beginthreadex vs CreateThread C++ http://stackoverflow.com/questions/331536/windows-threading-beginthread-vs-beginthreadex-vs-createthread-c library calls that call CreateThread behind the scenes. Once CreateThread has returned _beginthread ex takes care of additional..
Why does C++ not have reflection? http://stackoverflow.com/questions/359237/why-does-c-not-have-reflection exist for the benefit of the compiler and nothing else. Once the code has been compiled there are no classes. If you stretch..
What are rvalues, lvalues, xvalues, glvalues, and prvalues? http://stackoverflow.com/questions/3601602/what-are-rvalues-lvalues-xvalues-glvalues-and-prvalues n3055 The whole massacre began with the move semantics. Once we have expressions that can be moved and not copied suddenly..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c str2 str Now there are two references to the same string. Once there are no remaining references to str it will be deleted...
http://stackoverflow.com/questions/408670/stack-static-and-heap-in-c yourself that you couldn't do using this garbage collector Once someone said to me that with this declaration int asafe new..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three unpleasant effects Changes via a can be observed via b . Once b is destroyed a.name is a dangling pointer. If a is destroyed..
Does std::list::remove method call destructor of each removed element? http://stackoverflow.com/questions/4260464/does-stdlistremove-method-call-destructor-of-each-removed-element Guess what happens when you try to delete such a pointer Once again the answer is undefined behavior . Foo p Has p been properly..
http://stackoverflow.com/questions/4421706/operator-overloading be something as innocently looking as a list iterator . Once you got used to do i it becomes very hard to remember to do..
How many and which are the uses of “const” in C++? http://stackoverflow.com/questions/455518/how-many-and-which-are-the-uses-of-const-in-c trick is used in Alexandrescu's ScopeGuard utility class. Once the temporary goes out of scope the destructor of Derived is.. of the originally and the copie'd object remain the same. Once one of the object changes data you however need now two versions..
How to build Qt for Visual Studio 2010 http://stackoverflow.com/questions/5601950/how-to-build-qt-for-visual-studio-2010 variables set for building with Visual Studio 2010 tools. Once within the command prompt navigate to your extracted Qt folder.. script no scripttools no qt3support no multimedia no ltcg Once configure.exe has finished it was 10 minutes for me you'll need..
How to find all possible subsets of a given array? http://stackoverflow.com/questions/679203/how-to-find-all-possible-subsets-of-a-given-array 0 and 2^N to the elements in the x th subset of S . Once you've worked out how to enumerate the elements of a given subset..
Eclipse CDT C++11/C++0x support http://stackoverflow.com/questions/9131763/eclipse-cdt-c11-c0x-support setup. Make a new C project Default options for everything Once created right click the project and go to Properties C C Build..
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