C++ - Страница 1249

Consider a Base class and a derived class that inherits from it called Child. Assume the Base class has a member function declared virtual, and that Child overrides that function. I would like to declare a variable as a Base class object, initialize...

I'm having a problem with the RMB Context menus, In my main frame I have a grid control with the RMB context menu event. The shortcut keys appear correctly. See Copy for Ctrl + C,Paste for Ctrl + V, etc...

Then I have a dialog with already a...

I am trying to use a library (Intel TBB) in my R package on Windows, but not sure how to write makevars.win.

I have Rtools installed, and there are the library under include:

C:\RBuildTools\4.3\x86_64-w64-mingw32.static.posix\include\tbb

My...

I tried to use backtrace_symbols in a sianal handler, but now I know the function is not signal-safe.

And there is always the backtrace in android log when the crash happened, I want my program to be convenient like the backtrace in android...

I am trying to understand a C++ OpenGL project (github/XCSoar) using VSCode on a Debian Linux box (don't think that is significant, but...). I have noticed that the 'active/inactive' code block highlighting is wrong sometimes, and it really screws...

In general, (quiet) NAN times zero should give NAN -- and it does.

However, in one particular performance-critical part of my code, I want zero times anything to be zero.

What's a fast way to do this in C++?

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I have no issues reading file paths with ASCII characters but have issues reading file paths with Unicode characters. I have tried to ensure that the code is correctly encoded to support unicode characters but it still doesnt work. How do i read the...

I have a non-template class (Uart) and want to create template constructor. It needs to take another template class object (SafeQueue). Then this constructor will call another template function defined inside the class.

class signatures are given...

Compiling the following code gives the error message: type illegal.

int main() { // Compilation error - switch expression of type illegal switch(std::string( raj )) { case sda : } } You cannot use string in either switch or case. Why? Is there any...

I have a complex cc_test which has tons of args and envs specified in the rules:

cc_test( name= my_test , args= , env= {...tons of envs...}, ) Now I want to run it locally by running ./bazel-bin/my_test, so that I can use GDB to debug it.

The...

env: I use vscode ssh remote plug-in link ubuntu20.04(it run in orangepi3b, I don't know if that's the problem.) question:
1.1 when I ctrl + mouse leftclick, after clicking open() function is not into usr/include/fcntl.h function declaration, but...

Is there anything like boost::thread_group in C++11?

I'm just trying to port my program from using boost:thread to C++11 threads and wasn't able to find anything equivalent.

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How can I add values to graph nodes in c++?

int n,v,u; cin>>n>>q; vector g; for(int i=0; i>v>>u; v--,u--; g .pb(u); } I was solving a dfs problem and I got into this

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I working on my game engine with both support of Windows and Linux. And for Linux i added support for Xlib and XCB libraries that help me to create window and handling events in it. With Xlib all working good, but when i turn off vsync in XCB and...

If ShellExecute is called with the following parameters, no action is taken, and no errors are reported:

nResult = ShellExecute(nullptr, L open , strPptBuilderPath, strParameters, nullptr, SW_SHOWNORMAL); When strPptBuilderPath resembles...

Please let me know if my answers are good. I think I have an issue with the two while loops for number 2. I know how to do it in one while loop, but not two while loops for question 2.
Write C++ code to copy elements from an old queue to new queue...

I'm executing this function to push to a specific location of a vector a new pair of objects. But as soon the program tries to execute the push_back (emplace_back) function. The program gets stuck and I get it returns without any clear errors:...

In my code base there is code like the example below. A stringstream is used to collect output and later, if there have been things written to the stream these things are written to another stream. To check if there are things on the collecting...

I try to create a small app based on Vulkan v1.3.275.0 (and MoltenVK driver for macOS).

I successfully bundle my app into *.app with recommended Vulkan structure for macOS. My app opens a window using metal-cpp library and creates a Vulkan...

I'm working on a C++ application which uses a library written in C by another team. The writers of the library like to call exit() when errors happen, which ends the program immediately without calling the destructors of objects on the stack in the...

I am trying to call InitCommonControlsEx() in the main entry of a window program, and although I included the header and linked to the ComCtl32.Lib, for some reason the compiler underlines that function as undefined. Following is the code......

Using C++ on a Raspberry Pi 4, I'm building a single routine called monitor to watch my GPIO lines and log changes for all lines. My simple code using libgpiod:

void monitor() { const std::string chipname = gpiochip0 ; const std::vector offsets =...

I'm using IWICImagingFactory::CreateDecoderFromFilename() for reading only. Is there a way I can pass something like the FILE_SHARE_READ flag? The file stays open from the function call above until the program terminates.

During another operation...

I'm quite new to C++, and I have a question regarding a better way to write something I'm trying to do. I have a problem where I have text file where each line is and attribute of and object, structured something like this:

book 1984 An award...

I have made a cpp dll which performs encryption decryption using crypto++ Library. Now I have come to know that this dll is to be used in a c program . My dll is based on x64 arch in visual studio. How do I do this use case.

I tried using load...