Recent questions tagged C++

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c++ - Templates compilation: gcc vs VS2010

From the book - C++ Templates: The Complete Guide by David, Nicolai Thus, templates are compiled twice: ... with out template instantiation ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Copying from cuda 3D memory to linear memory: copied data is not where I expected

Here is my issue: I have a 3D array of float3 on my device: int size[3] = {416,464,512}; cudaExtent extent ... the problem might be in my code ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Does Android support weak symbols?

I've been looking at questions like: Cannot load library: reloc_library[1285]: cannot locate 'rand' Android app ... GCC 4.9 cross-compiler See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - wxWidgets-2.9.4include and libgcc_libmswu No such file or directory error on CodeBlocks

I'm trying to learn C++ programming with wxWidgets and CodeBlocks (with MinGW) and earlier today I succeeded in ... path had spaces in it See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Performantly appending (rich) text into QTextEdit or QTextBrowser in Qt

QTextEdit can be appended text to simply using append(). However, if the document is rich text, every time you ... slowing down the entire UI? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using shared_ptr for unique ownership (kind of) - is this good practice?

this is quite hard to explain but I'll try my best. So, I have a RenderComponent, EventManager and RenderSystem. ... ) and thanks for your help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Make child process spawned with system() keep running after parent gets kill signals and exits

In a Linux/C++ library I'm launching a process via the system() call, system("nohup processName > /dev/ ... ID and doing something with it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Boost::Spirit : Optimizing an expression parser

I'm trying to write a program to parse and evaluate mathematical, litteral and boolean expressions, for example : " ... : what could I improve? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - <unresolved overloaded function type> when trying to pass an aggregated object's method to its class method

I have some problem compiling my code. I have the following structure: #include <cstdlib> using namespace std; ... very much for the help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reading in a specific format with cin

How can i read in a specific format using cin? Example:-for reading a complex number, I would like the ... right way?Help greatly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenGL - Picking (fastest way)

I would like to implement scene picking (for mouse clicks, moves, etc.). What is the best, fastest way? I ... shader. And what about speed? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Render filled complex polygons with large number of vertices with OpenGL

I use OpenGL to render 2D map and in the process I need to render filled polygons with large number of vertices( ... , it still takes too long. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ read pixels with GetDIBits()

I'm trying to create a function which is equivalent to the windows API GetPixel() function, but I want to ... : mingw32-gcc Library gdi32 linked See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Qt video frames from camera corrupted

EDIT: The first answer solved my problem. Apart from that I had to set the ASI_BANDWIDTH_OVERLOAD value to 0. ... looks: This looks awful. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OPENCV: PCA application error in image_proc

Base from this here. I got this error and this is the only one left for almost 3 days of my trial and ... .2 following this blog. Please help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to change the title bar icon using winapi

I have made an application using Windows API and have used the resource folder to change the icon to a custom one ... , NULL, hInstance, NULL); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to append text to a TextBox?

I think the following code should be self-explanatory. #include <Windows.h> static HWND textBoxInput; static HWND button ... input at the end. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Trying to replace words in a string

I am trying to take the words from output and find any word with the letter Q in it. If the word does, it needs ... endl; cin.get(); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Boost::process output blank lines

I am developing an application where I need to launch and stop a variety of different executables depending on ... wrong with copy constructors? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is the assignment operator not called in this case in favor of the copy constructor?

From the wikipedia page for copy constructors: X a = X(); // valid given X(const X& copy_from_me) but not valid given ... want to copy X a(b); ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to multiply two openCV matrices in a kernel function in CUDA?

I have the following minimal piece of code and would like to know how I can multiply two matrices in my kernel ... how I can solve these issues? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Runtime typeswitch for typelists as a switch instead of a nested if's?

This is from TTL: //////////////////////////////////////////////////////// ... do this type switch as a single select statement instead? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Error: expression must be a pointer to a complete object type (?)

This is the function in C that I need to modify. I am trying to have PREVIOUS 4 bytes of address starting from "box ... code */ return (0); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Thread locals in Lua

In my application a Lua script can subscribe to certain events from a Client. It is also possible to have one ... within a specific Lua thread? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to write a regular expression for html parsing?

I'm trying to write a regular expression for my html parser. I want to match a html tag with given ... I'm using boost regex libraries. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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580 views

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c++ - reading and writing to QProcess in Qt Console Application

Noted: this appears to be a specific issue question but hopefully it can be edited for all to related to I ... " script issue? QProcess issue? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::cout not printing the value with out endl (newline specifier)

Below is my c++ program to multiply two strings (Integers in strings) and produce the integer result in string. I ... correctly **/ return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - simple window without titlebar

Good afternoon everyone! I have been working on a project that requires a basic window without a titlebar. ... would be appreciated! Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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