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What does the Q_OBJECT macro do? Why do all Qt objects need this macro?

...ual const QMetaObject *metaObject() const; virtual void *qt_metacast(const char *); virtual int qt_metacall(QMetaObject::Call, int, void **); static inline QString tr(const char *s, cons t char *c = nullptr, int n = -1) { return staticMetaObject.tr(s, c, n); } __attribute__ ((__deprecated__)) static...
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Does making a struct volatile make all its members volatile?

...by the pointer as const or volatile, use a declaration of the form: const char *cpch; volatile char *vpch; To declare the value of the pointer — that is, the actual address stored in the pointer — as const or volatile, use a declaration of the form: char * const pchc; char * volatile pchv; ...
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How to send a simple string between two programs using pipes?

...lt;sys/types.h> #include <unistd.h> int main() { int fd; char * myfifo = "/tmp/myfifo"; /* create the FIFO (named pipe) */ mkfifo(myfifo, 0666); /* write "Hi" to the FIFO */ fd = open(myfifo, O_WRONLY); write(fd, "Hi", sizeof("Hi")); close(fd); /* rem...
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Why is argc not a constant?

...at any C function can do. Also, getopt is declared as int getopt(int argc, char * const argv[], const char *optstring);. And here the const is not top level, but declares the pointers to be const, a promise to not modify them (although the strings that they point to might conceivably be modified). ...
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How to parse the AndroidManifest.xml file inside an .apk package

...// StringTable, each string is represented with a 16 bit little endian // character count, followed by that number of 16 bit (LE) (Unicode) chars. int stOff = sitOff + numbStrings*4; // StringTable follows StrIndexTable // XMLTags, The XML tag tree starts after some unknown content after the // S...
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UINavigationBar custom back button without title

...se that you have a navigation controller going to ViewA from ViewB. In IB, select ViewA's navigation bar, you should see these options: Title, Prompt and Back Button. ViewA navigate bar options The trick is choose your destiny view controller back button title (ViewB) in the options of previous ...
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What differences, if any, between C++03 and C++11 can be detected at run-time?

...zeof(b); } Also, the fact that string literals do not anymore convert to char* bool isCpp0xImpl(...) { return true; } bool isCpp0xImpl(char*) { return false; } bool isCpp0x() { return isCpp0xImpl(""); } I don't know how likely you are to have this working on a real implementation though. One t...
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using extern template (C++11)

....cpp template<typename T> void f(){} // Explicit instantiation for char. template void f<char>(); Main.cpp #include "TemplHeader.h" // Commented out from OP code, has no effect. // extern template void f<T>(); //is this correct? int main() { f<char>(); return 0...
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What is the difference between printf() and puts() in C?

...e (except for the added newline) if the string doesn't contain any control characters (%) but if you cannot rely on that (if mystr is a variable instead of a literal) you should not use it. So, it's generally dangerous -and conceptually wrong- to pass a dynamic string as single argument of printf...
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Best way to repeat a character in C#

...turns "aa" from... Is there a built-in function to repeat string or char in .net? share | improve this answer | follow | ...