Description:
The object-oriented C++ language.
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A Qustion about iostream
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Yesterday, my friend ask me a question about iostream.I know the result ,but can't explain.The program is below: ------------------------------ ------------------------------ ------------------------------ ------------------------------ --------------------------- ...using namespace std; int fun( int x )... more »
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Function functors?
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I have a function that computes the distance between some objects. The distance could be euclidian, manhaten etc. I would therefore like to implement the distance metric as a functor as seen below: template<typename dist> function compute_distance(double a, double b) { dist dist_measure; double distance = dist_measure(a,b);... more »
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hash_map vs unordered_map
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Hi, I am wondering if there are any functional differences between SGI's hash_map and tr1's unordered_map. Can these two containers be interchanged? What would it take to switch from hash_map to unordered_map? Thank you. -Marek
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How to convert exe file of cgi script into .cgi extension.
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Hi. i learn about cgi scripting in c++ from deitel & deitel. in this book he uses .cgi extension files while when i compile the file on windows platform is .exe. in book he browse the .cgi files i dont know how he makes cgi file.and run in windows xp. can anyone help me to convert exe file into cgi so that i can use this... more »
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returned type of boost::bind && Address of a tmp object
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Hello, in the following code I have a pointer (to function), say p, of type double (*)(double, double, void*) and I try to fix the second argument of the function *p to a given value (using boost::bind), but the compiler complains, because of a type mismatch in an assignment which I think should be legal:... more »
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singleton template class
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Will this function is singleton or do I need to declare a ctor in the derived class as public, as well as copy-ctor and assignment operator. template<typename T> class CSingleton { public: static T& Instance() { static T me; return me; } }; class MyClass: public CSingleton<MyClass>... more »
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Reference counting and API (const reference vs pointer oriented)
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Hi there I have implemented a very simple smartpointer class (invasive design). And I was wondering what should be the natural API when using those in a Container. I choose to define the following operator in my smartpointer class: ... operator ObjectType * () const { return Pointer; } ... which in turn forces me to have a pointer interface (instead of const... more »
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stringstream bin buffer to hex string conversion
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Hello I want to convert a char* buffer to a std::string containing a hex description of it. I use a std::stringstream in the following manner: std::tstring ToHex( const char* buffer, size_t size, bool withSize ) { std::tstringstream str; str.setf(std::ios_base::hex, std::ios::basefield); str.setf(std::ios_base::upperc ase);... more »
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clear() vs destructor?
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For a std::vector, what's the difference between the clear() function and its destructor? I know their usages are different, but how about their implementations?
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