Hello I wanted to write a function with a variable argument list. I want to explore my options. I'm pretty sure I came accross a boost template class that was designed for this purpose, but I can't think of the name of it? Can anyone tell me? or did I dream this up! Thanks ...
Does Intel C++ predefine some macro when compiling with Qstd=c++0x? Something like __GXX_EXPERIMENTAL_CXX0X__ in GCC? __cplusplus is still 199711. Any way to detect C++0x compilation? ...
I'm working with an existing module at the moment that provides a C++ interface and does a few operations with strings. I needed to use Unicode strings and the module unfortunately didn't have any support for a Unicode interface, so I wrote an extra function to add to the interface: void SomeUnicodeFunction(const wchar_t* string) How...
I want to write a simple adder (for giggles) that adds up every argument and returns a sum with appropriate type. Currently, I've got this: #include <iostream> using namespace std; template <class T> T sum(const T& in) { return in; } template <class T, class... P> auto sum(const T& t, const P&... p) -> decltype(t + sum(p...)) { ...
What algorithm finds a common sequence that is out of order between two strings? I need to implement or use one in C++. ...
#define one 0 #ifdef one printf("one is defined "); #ifndef one printf("one is not defined "); In this what is the role of #ifdef and #ifndef, and what's the output? ...
If I have a class that has many int, float, and enum member variables, is it considered efficient and/or good practice to return them as references rather than copies, and return constant references where no changes should be made? Or is there a reason I should return them as copies? ...
Came across this one while browsing the response to another question on SO (References Vs Variable Gets). My question is that for all 64bit environments is it guaranteed that a reference to a variable will be of 64 bits even if the original had a lesser size? As in char references in 64bit environment would be >sizeof(char)? Is there any...
I am now trying to optimize the launch time of an application, and currently want to reduce the time spent by the OS image loader. From dyld(1), I found two environment variables: DYLD_PRINT_STATISTICS and DYLD_PRINT_INITIALIZERS. DYLD_PRINT_STATISTICS causes dyld to print statistics about how dyld spent its time. This is its output wh...
Hi all! I'm using Code::Blocks to build my project, which contains three files: main.cpp, TimeSeries.cpp, TimeSeries.h. TimeSeries.h provides declarations for the TimeSeries class as follows: template<class XType, class YType> class TimeSeries { public: TimeSeries(void); ~TimeSeries(void); }; Then TimeSeries.cpp contains: ...
if i have for example class A which contains the functions: //this is in A.h friend const A operator+ (const A& a,const A& b); friend const A operator* (const A& a,const A& b); which is a global (for my understanding). this function implemented in A.cpp. now, i have class B which also contains the functions, and the member: //this ...
I am trying to design header only library, which unfortunately needs to have global static variable (either in class or in namespace). Is there any way or preferred solution to have global static variable while maintaining header only design? The code is here ...
Hello! I have already read a lot about C++ exceptions and what i see, that especially exceptions performance is a hard topic. I even tried to look under the g++'s hood to see how exceptions are represented in assembly. I'm a C programmer, because I prefer low level languages. Some time ago I decided to use C++ over C because with small...
When i Try to Build My source code ,it says MSVCP90D.dll missing. I'd like to know how to correct this Thanks ...
I've got a VS2008 C++ solution containing one project which is a Win32 console application. I have developed a few classes that I want to re-use in another project. Apart from copying the source files into new projects, what's the correct way to turn my classes into some sort of reusable component? Should I be using a standard DLL, or a...
I have an idl file containing the bellow string const wstring ROOT_DOMAIN = L"S_ROOT" I was using open orb 1.3.1 to convert this idl file to java. But it shows bellow error Undefined identifier : L But When I removed L from idl file , it was working fine. Why this error is happening ? What should I do to avoid this error ? ...
Hi, I wanna show web page in my program. I using Dev-C++ and I'm new. How I can do this? Best regards ...
I need to create a minheap template which includes nodes in it. The problem I have is that I don't know if I need to create a node template class as well, or should it be included inside the heap template class as a struct? ...
I have a C++/Qt/mingw app and would like to use msi.h (Microsoft Installer interface), but mingw does not seem to provide this header. How can I do this? ...
Hi, I have three gyroscope values, pitch, roll and yaw. I would like to add Kalman filter to get more accurate values. I found the opencv library, which implements a Kalman filter, but I can't understand it how is it really work. Could you give me any help which can help me? I didn't find any related topics on the internet. I tried to ...