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c++ Programming Glossary: compiledIn C++, why use static_cast<int>(x) instead of (int)x? http://stackoverflow.com/questions/103512/in-c-why-use-static-castintx-instead-of-intx ... CMyBase pSomething filled somewhere Now these two are compiled the same way CMyClass pMyObject pMyObject static_cast CMyClass..
In C++ source, what is the effect of extern “C”? http://stackoverflow.com/questions/1041866/in-c-source-what-is-the-effect-of-extern-c definition is contained in a binary format that was compiled by your C compiler that the client 'C' linker will then link..
What is a “translation unit” in C++ http://stackoverflow.com/questions/1106149/what-is-a-translation-unit-in-c preprocessing statements. A single translation unit can be compiled into an object file library or executable program. The notion..
Is gcc4.7 buggy about regular expressions? [duplicate] http://stackoverflow.com/questions/12530406/is-gcc4-7-buggy-about-regular-expressions st 1 st mt tr matches mt 1 st mt tr matches tr 0 when compiled with gcc MacPorts gcc47 4.7.1_2 4.7.1 either with g .cc o test..
What is an undefined reference/unresolved external symbol error and how do I fix it? http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix referred to as linking. It basically means that you compiled a bunch of implementation files into object files or libraries..
http://stackoverflow.com/questions/145270/calling-c-c-from-python work on any python that has ctypes not just the one it was compiled against. Suppose you have a simple C example class you want..
UTF8 to/from wide char conversion in STL http://stackoverflow.com/questions/148403/utf8-to-from-wide-char-conversion-in-stl and WideCharToMultiByte. However the code is compiled for multiple OSes and I'm limited to standard C library. c..
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 in this context is translation unit in your project is compiled separately and independently . When parsing a .cpp file the..
What is the name of this operator: “-->”? http://stackoverflow.com/questions/1642028/what-is-the-name-of-this-operator comp.lang.c .moderated I was completely surprised that it compiled and worked in both Visual Studio 2008 and G 4.4. The code #include..
http://stackoverflow.com/questions/213907/c-stdendl-vs-n mode which is what you get unless you ask for binary. The compiled program will write out the correct thing for the system compiled.. program will write out the correct thing for the system compiled for. The only difference is that std endl flushes the output..
Why does C++ compilation take so long? http://stackoverflow.com/questions/318398/why-does-c-compilation-take-so-long hundreds or even thousands of headers to be 1 loaded and 2 compiled. Every one of them typically has to be recompiled for every.. and 2 compiled. Every one of them typically has to be recompiled for every compilation unit because the preprocessor ensure that.. the main reason as it requires huge amounts of code to be compiled for every compilation unit and additionally every header has..
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 use for various bits of unowned uninitialized memory when compiled for debug mode support may vary by compiler version Value Name.. 0xFE is used in VS 2008 and later. 0xCC When the code is compiled with the GZ option uninitialized variables are automatically..
Developing Internet Explorer Extensions? http://stackoverflow.com/questions/5643819/developing-internet-explorer-extensions that may be different on yours. 64bit IE Needs 64bit compiled and 64bit registered BHO. Use 64bit RegAsm.exe usually lives..
How to generate a stacktrace when my gcc C++ app crashes http://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes also runs on Linux Windows and Macintosh all versions are compiled using gcc . I would like my program to be able to generate a..
What is the difference between _tmain() and main() in C++? http://stackoverflow.com/questions/895827/what-is-the-difference-between-tmain-and-main-in-c set they've defined _tmain which if Unicode is enabled is compiled as wmain and otherwise as main . As for the second part of your..
Why does changing 0.1f to 0 slow down performance by 10x? http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x on whether 0 or 0.1 is used. Here's the test code compiled on x64 int main double start omp_get_wtime const float x 16.. actually becomes faster. This requires that the code be compiled with SSE enabled. This means that rather than using these weird..
Writing a binary file in C++ very fast http://stackoverflow.com/questions/11563963/writing-a-binary-file-in-c-very-fast char a size sizeof unsigned long long myfile.close Compiled with Visual Studio 2010 and full optimizations and run under..
http://stackoverflow.com/questions/12135518/is-faster-than greater ZF 0 and SF OF etc... Example Edited for brevity Compiled with gcc m32 S masm intel test.c if a b Do something 1 Compiles..
http://stackoverflow.com/questions/12437955/gcc-and-precompiled-headers reading this nice article The Care and Feeding of Pre Compiled Headers I have some doubts regarding how these can actually..
Can placement new for arrays be used in a portable way? http://stackoverflow.com/questions/15254/can-placement-new-for-arrays-be-used-in-a-portable-way this is the case. The following example shows the problem. Compiled with Visual Studio this example results in memory corruption..
Swapping two variable value without using 3rd variable http://stackoverflow.com/questions/1826159/swapping-two-variable-value-without-using-3rd-variable USE_XOR xorSwap x y # else tempSwap x y # endif return x y Compiled using gcc Os main.c o swap The xor version takes real 0m2.068s..
Why does valgrind say basic SDL program is leaking memory? http://stackoverflow.com/questions/1997171/why-does-valgrind-say-basic-sdl-program-is-leaking-memory 640 480 16 SDL_HWSURFACE SDL_Quit return 0 Compiled with the command g o test test.cpp lSDL And here is the output..
std::thread error (thread not member of std) http://stackoverflow.com/questions/2519607/stdthread-error-thread-not-member-of-std std endl int main F f std thread t f t.join return 0 Compiled with g Wall g std c 0x pthread main.cpp Output of a.out Printing..
C++ can compilers inline a function pointer? http://stackoverflow.com/questions/4860762/c-can-compilers-inline-a-function-pointer char_traits char operator 40204Ch 00401067 ret The same. Compiled with MSVC 2010 vanilla Release. share improve this answer..
http://stackoverflow.com/questions/69115/char-to-hex-string-exercise or other way that I am missing How can I make this faster Compiled with O3 in g static const char _hex2asciiU_value 256 2 '0' '0'..
C/C++: Array size at run time w/o dynamic allocation is allowed? http://stackoverflow.com/questions/737240/c-c-array-size-at-run-time-w-o-dynamic-allocation-is-allowed for size_t i 0 i size i array i i cout i endl return 0 Compiled under GCC. How can the size be determined at run time without..
Is this C++11 regex error me or the compiler? http://stackoverflow.com/questions/8060025/is-this-c11-regex-error-me-or-the-compiler . works. n regex r4 0 9 printf 0 9 works. n return 0 Compiled successfully with this command no error messages g std c 0x..
http://stackoverflow.com/questions/8130602/using-extern-template-c0x files source1.o void something1 void ReallyBigFunction int Compiled first time source2.o void something2 void ReallyBigFunction.. time source2.o void something2 void ReallyBigFunction int Compiled second time If both files are linked together one void ReallyBigFunction..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle .3f Gflops res f n t double n t 1e9 x return EXIT_SUCCESS Compiled with g O2 march native addmul.cpp . a.out 1000 produces the.. 10000000 system pause Output 1 thread 10000000 iterations Compiled with Visual Studio 2010 SP1 x64 Release Seconds 55.5104 FP Ops.. 17.3 GFlops not bad. Output 8 threads 10000000 iterations Compiled with Visual Studio 2010 SP1 x64 Release Seconds 117.202 FP Ops..
Why is one loop so much slower than two loops? http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops to for int j 0 j n j a1 j b1 j for int j 0 j n j c1 j d1 j Compiled on MS Visual C 10.0 with full optimization and SSE2 enabled..
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 sec cerr Crunch speed lps endl else cerr endl return 0 Compiled with g O3 o readline_test_cpp foo.cpp Python Equivalent # usr..
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