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c++ Programming Glossary: ideoneWhich is better option to use for dividing an integer number by 2? http://stackoverflow.com/questions/10681375/which-is-better-option-to-use-for-dividing-an-integer-number-by-2
Find position of element in C++11 range-based for loop? http://stackoverflow.com/questions/10962290/find-position-of-element-in-c11-range-based-for-loop p index v std cout p.first p.second n You can see it at ideone though it lacks the for range loop support so it's less pretty...
Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513? http://stackoverflow.com/questions/11413855/why-is-transposing-a-matrix-of-512x512-much-slower-than-transposing-a-matrix-of lets us alter the size duh . I posted two versions on ideone size 512 average 2.46 ms http ideone.com 1PV7m size 513 average.. two versions on ideone size 512 average 2.46 ms http ideone.com 1PV7m size 513 average 0.75 ms http ideone.com NShpo In.. ms http ideone.com 1PV7m size 513 average 0.75 ms http ideone.com NShpo In my environment MSVS 2010 full optimizations the..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali buffering putting binary data into an ostringstream http ideone.com 2PPYw putting binary data into a char buffer http ideone.com.. 2PPYw putting binary data into a char buffer http ideone.com Ni5ct putting binary data into a vector char using back_inserter.. binary data into a vector char using back_inserter http ideone.com Mj2Fi NEW vector char simple iterator http ideone.com 9iitv..
C++ performance challenge: integer to std::string conversion http://stackoverflow.com/questions/4351371/c-performance-challenge-integer-to-stdstring-conversion to compete against The C way using stringstream http ideone.com jh3Sa sprintf which SO ers usually recommend to the performance.. SO ers usually recommend to the performance conscious http ideone.com 82kwR Contrary to popular belief boost lexical_cast has.. dependent on integer modulo Ben's algorithms http ideone.com SsEUW If you want to use that code I'll make it available..
Use of typename keyword with typedef and new http://stackoverflow.com/questions/4421306/use-of-typename-keyword-with-typedef-and-new X p but here T X means int X The complete code is here at ideone. Please have a look at it before replying. c templates typedef..
Do static members of a class occupy memory if no object of that class is created? http://stackoverflow.com/questions/4842056/do-static-members-of-a-class-occupy-memory-if-no-object-of-that-class-is-created global objects accessed through A j . See demonstration at ideone http www.ideone.com YeYxe 9.4.2 1 from the C Standard 2003 A.. through A j . See demonstration at ideone http www.ideone.com YeYxe 9.4.2 1 from the C Standard 2003 A static data member..
Calculating and printing factorial at compile time in C++ http://stackoverflow.com/questions/4977715/calculating-and-printing-factorial-at-compile-time-in-c be defined Here 3628800 is factorial of 10 . See it at ideone http www.ideone.com RWAmt So are you looking for this EDIT Matthieu.. 3628800 is factorial of 10 . See it at ideone http www.ideone.com RWAmt So are you looking for this EDIT Matthieu asked for..
When is a function try block useful? http://stackoverflow.com/questions/5612486/when-is-a-function-try-block-useful e std cout e std endl int main f 1 f 1 return 0 Output at ideone greater than zero less than zero EDIT As some people might think..
How can I reliably get the address of an object? http://stackoverflow.com/questions/6494591/how-can-i-reliably-get-the-address-of-an-object
Why doesn't left bit-shift, “<<”, for 32-bit integers work as expected when used more than 32 times? http://stackoverflow.com/questions/7401888/why-doesnt-left-bit-shift-for-32-bit-integers-work-as-expected-when-used the output should be 0. What is happening The code is on ideone http ideone.com VPTwj . c bit shift share improve this question.. should be 0. What is happening The code is on ideone http ideone.com VPTwj . c bit shift share improve this question This..
Is it possible to figure out the parameter type and return type of a lambda? http://stackoverflow.com/questions/7943525/is-it-possible-to-figure-out-the-parameter-type-and-return-type-of-a-lambda f int return true error But it obviously would give error ideone . So I changed it to TLambda version of the function template..
std::ostringstream printing the address of the c-string instead of its content http://stackoverflow.com/questions/8287188/stdostringstream-printing-the-address-of-the-c-string-instead-of-its-content weird behavior that I just could not explain at first see ideone #include iostream #include sstream #include string int main..
Why does C++ need the scope resolution operator? http://stackoverflow.com/questions/9338217/why-does-c-need-the-scope-resolution-operator B A void f int std cout B f int std endl Now see this ideone B b b.f 10 ok b.f error as the function is hidden b.f cannot..
What is the optimal algorithm for generating an unbiased random integer within a range? http://stackoverflow.com/questions/11758809/what-is-the-optimal-algorithm-for-generating-an-unbiased-random-integer-within-a pick a winner. The working code can be found at this Ideone page . For example with 10 buckets and 100 balls the maximum..
http://stackoverflow.com/questions/11774277/lambdas-and-stdfunction func item tmp.push_back item return tmp Live example on Ideone. Another possible way would be to not restrict the functor type.. T v F fun decltype bool fun v 0 void ... Live example on Ideone. This function will be removed from the overload set if fun..
Why doesn't (int)0.9999999999999999999728949456878623891498136799780L == 0 (possible GCC bug)? http://stackoverflow.com/questions/16831464/why-doesnt-int0-9999999999999999999728949456878623891498136799780l-0-poss the following output int 1.000000 1 int 1.000000 0 Ideone also produces this behavior. What is the compiler doing to allow..
Concept behind these four lines of tricky C++ code http://stackoverflow.com/questions/17992553/concept-behind-these-four-lines-of-tricky-c-code 771 int main m 1 m 0 2 main printf char m It is at Ideone http ideone.com PM4qan . c c deobfuscation share improve..
http://stackoverflow.com/questions/5397447/struct-padding-in-c even though both structs has same members Code at Ideone http ideone.com HGGVl The bottomline is that the Standard doesn't..
How to “pattern match” a template? http://stackoverflow.com/questions/5440089/how-to-pattern-match-a-template c.begin Phew And that's it A full example can be seen on Ideone . Of course it would be possible to refine that even further.. function syntax of which an example can be found here on Ideone . Edit 2 Well I don't know why but I totally didn't think of..
http://stackoverflow.com/questions/5450159/type-erasure-techniques now because both examples are rather lengthy I'll link to Ideone with class and example code to both implementations. If there..
Finding duplicates in O(n) time and O(1) space http://stackoverflow.com/questions/5739024/finding-duplicates-in-on-time-and-o1-space
http://stackoverflow.com/questions/6108704/renaming-namespaces this question using namespace new nested Example at Ideone . Or if you actually want a real alias namespace on one nested..
http://stackoverflow.com/questions/6245735/pretty-print-stdtuple os t aux gen_seq sizeof... Args return os Live example on Ideone. For the delimiter stuff just add these partial specializations..
How to force a static member to be initialized? http://stackoverflow.com/questions/6420985/how-to-force-a-static-member-to-be-initialized Bar Foo Bar static char const get_dummy return 42 Also on Ideone . I'd expect dummy to get initialized as soon as there is a..
Why can't char** be the return type of the following function in C++? http://stackoverflow.com/questions/7138720/why-cant-char-be-the-return-type-of-the-following-function-in-c char carr 10 carr f char v 10 new char 5 10 return v Ideone . Basically char v 10 defines a pointer to a char array of size..
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000? http://stackoverflow.com/questions/8763497/how-to-drive-c-c-or-java-compiler-to-compute-123-1000 sum_from 1u to 1000u equals 500500u p Live example on Ideone . Output for MSVC10 error C2514 'sum_from Start to Goal equals..
Why does the rvalue overload of `operator<<` for `basic_ostream` return an lvalue reference? http://stackoverflow.com/questions/8828973/why-does-the-rvalue-overload-of-operator-for-basic-ostream-return-an-lvalu hi there n std cout s.rdbuf oops Live example on Ideone perfect example of undefined behaviour. Prints nothing for me..
http://stackoverflow.com/questions/8873048/why-is-x-x-x-allowed-when-x-defines-a-conversion-to-function-pointer-b int main X x Y y x 5 works y 5 doesn't Live example on Ideone . Output error no match for call to ' Y int ' Q1 Why is the..
Will member subobjects of local variables be moved too if returned from a function? http://stackoverflow.com/questions/9183087/will-member-subobjects-of-local-variables-be-moved-too-if-returned-from-a-functi f X x return x.t int main traced t f Live example on Ideone. And neither GCC 4.7 ToT nor Clang 3.1 ToT will display move..
Why does the compiler select the base class constructor inside the template argument list? http://stackoverflow.com/questions/9223441/why-does-the-compiler-select-the-base-class-constructor-inside-the-template-argu struct C public A B C A B ERROR HERE Live example on Ideone. Output prog.cpp 1 9 error 'struct B B B' is inaccessible prog.cpp..
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