define a struct inside a class in C++
Can someone give me a example about how to define a new type of struct in a class in C++.Thanks. ...
c++
Install the proper bitness Visual C++ Runtime Library via a Setup project
Hi all! The context: I have a solution that contains amongh other C# projects, a VC++ project that suports compiling only as x64 or Win32 (but not Any CPU). In order for the application (which in fact is a macro for a third party application) to run, it requires Visual C++ Runtime libraries (x86) or (x64) (The macro will run on both x6...
C++ operator overloading doubt
I have a code base, in which for Matrix class, these two definitions are there for () operator: template <class T> T& Matrix<T>::operator() (unsigned row, unsigned col) { ...... } template <class T> T Matrix<T>::operator() (unsigned row, unsigned col) const { ...... } One thing I understand is that the second one does not re...
Determining actual args an Excel UDF was called with.
I'm adding a user defined function to Excel with varargs-based signature in C++: LPXLOPER MyFunction(...); When Excel calls MyFunction, it passes it 30 arguments regardless of how many the user entered in the sheet. The extraneous ones are blank strings. MyFunction, however, is designed to accept empty string arguments. As a result, ...
Segfault in a matrix code using new
Hi all I created a simple class in C++ which has a private dynamic array. In the constructor I initialize the array using new and in the destructor I free it using delete. When I instantiate the class using Class a = Class(..); it works as expected, however it seems I cannot instantiate it using the new operator (Like Class *a = new Cl...
ld reports missing symbols, but symbols seem to exist
I'm trying to link my mac application to the wonderful libancillary library. However, I have changed the library build script to create a shared library. I can inspect the symbols in this library using nm libancillary.dylib - the result is: libancillary.dylib(single module): U ___sF U __keymgr_get_and_lock_processwide_...
C++ wrapper for posix and linux specific functions
Hi Do you know about any good library wrapping posix and linux functions and structures ( eg. sockets or file descriptors ) into C++ classes? For example I'm thinking about a base FileDescriptor class and some inheriting classes ( unix sockets etc ) with methods like write, read or even some syscalls ( sendfile, splice ) - all throwing ...
Run time Debugging
We have recently downloaded, installed and compiled gcc-3.0.4 code. gcc compiler has built successfully and we where able to compile some same test cpp file. I would like to know how we can modify gcc source code so that we add additional run time debugging statements like the binary in execution compiled by my gcc should print below sta...
How do i typecast cvseq to cvpoint
Hai , how do i typecast in opencv ,I want to type cast to cvseq to cvpoint ...
c++ floating point to integer type conversions
What are the different techniques for a floating point type to an integer type conversion, in c++? ...
CHtmlView class and focus
I have an SDI application written in MFC. The frame is divided into 1 row and 2 columns using a splitter window. Below are details of Row and Column (R0C0 means Row#0 and Col#0) R0C0 view is a CFormView with multiple input controls like text box, combo box etc. R0C1 view is a CHtmlView that contains HTML content relavant to the contro...
Doxygen groups and modules index
Hi I am creating a doxygen document for my project. Recently, I have grouped related classes using \addtogroup tag. After this, I have got a module tab in my documentation. It shows all modules. I want to add some description right below module name below the module name on the same page. How can I do it using doxygen ? Here's my tag ...
VS 2008 Compiler option for flagging uninitialized variables.
Is there a compiler option in VS 2008 (C++) to expose uninitialized variables? I'm trying to debug a problem where the "release" build of a DLL does not work but the "debug" build of the DLL does work. ...
bitwise OR on strings
How can i do a Bitwise OR on strings? A: 10001 01010 ------ 11011 Why on strings? The Bits can have length of 40-50.Maybe this could be problematic on int ? Any Ideas ? ...
Using the same variable across multiple files in C++
In the process of changing some code, I have spilt some functions into multiple files. I have the files controls.cpp and display.cpp and I would like to be able to have access to the same set of variables in both files. I don't mind where they are initialized or declared, as long as the functions in both files can use them. This was not...
What happens to an ActiveX control (COleControl) after the call to OnDestroy() ?
I have an ActiveX control written in C++ that runs in Internet Explorer 8. Most of the time (approx 90%) when the tab or browser containing the control is closed, there is an access violation like this: The thread 'Win32 Thread' (0x1bf0) has exited with code 0 (0x0). Unhandled exception at 0x77b3b9fd in iexplore.exe: 0xC0000005: Access ...
Confused about type conversion in C++
In C++, the following lines have me confused: int temp = (int)(0×00); int temp = (0×00int); What is the difference between those 2 lines? ...
How to extract channel POD-type from a boost::gil homogeneous pixel type ?
I have a class templated on <PIXEL>, assumed to be one of boost::gil's pixel types (for now, only either gray8_pixel_t or gray16_pixel_t, and I only expect to support homogeneous pixel types e.g rgb8_pixel_t in future). The class needs to get hold of unsigned char or unsigned short as appropriate to the pixel type; I assume this is buri...
Qt - resize QTextEdit in a QWidget while it is being resized the QWidget
How to make QTextEdit to be resized in a QWidget while the QWidget is being resized? Should I overload resizeEvent functin for the QWidget? ...
convert bitset to string ??
Hi .. What is wrong with this code ? set<string> nk ; bitset<3> bs1(string("100")); nk.insert(bs1.to_string()); error: no matching function for call to `std::bitset<3u>::to_string()' why?! UPDATE : Thansk , this works . But why does it work ? :D ...