Recent questions tagged C++

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c++ - How to pass two-dimensional array as an argument?

My Matrx class is defined as class Matrx { double A[50][50]; int m,n; public: Matrx(void); Matrx( ... array as argument of the function? 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 SubTexturing

I have image data and i want to get a sub image of that to use as an opengl texture. glGenTextures(1, ... takes part of my framebuffer. 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++ - Creating a cmake project with visual studio

Visual Studio 2017 provides built-in support for handling CMake projects. The documentation mostly covers scenarios ... CMakeLists.txt file? 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 do glPushMatrix() and glPopMatrix() keep the scene the same?

I found some code online which will move a box across the screen, then reset it after the box hits the ... off again after making the change? 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++ - Perfect square and perfect cube

Is there any predefined function in c++ to check whether the number is square of any number and same for the cube.. 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++ - Recursive function for listing all files in sub directories

I'm trying to write a function that returns a list of all files on current folder and all of its sub ... function should have. Any hints? 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++ - Lambda closure type constructors

The cppreference shows that there are different rules for lambda closure type constructors. Default Construction - ... those short comings? 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 add Poco library in Visual Studio 2010?

It's been a while since I've programmed in C++ and right now I'm struggling with this Poco library I'm ... 'd really appreciate it. Thank you. 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 determine a windows executables DLL dependencies programmatically?

How to determine what DLL's a binary depends on using programmatic methods? To be clear, I am not trying to ... third party app (like depends). 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 std::bind can be assigned to argument-mismatched std::function?

I have code as follows: #include <functional> #include <iostream> using namespace std; void F(int x) { cout ... .4.0 Thread model: posix 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++ - Rvalues, lvalues and formal definitions

People are confused when they hear that in int&& x x has rvalue reference type, but x is an lvalue. ... refers to the value category. 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++ - Check if a type is passed in variadic template parameter pack

I've heard somewhere, that using new C++1z syntax, it is really easy to check if a type is passed in variadic template ... T1, Ts...>::value; }; 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++ - Converting steady_clock::time_point to time_t

I'm using the steady_clock for saving the time stamp of some messages. For debug purpose is usefull to have ... the time_since_epoch().count() 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++ - What is wrong with my For loops? i get warnings: comparison between signed and unsigned integer expressions [-Wsign-compare]

#include <iostream> #include <string> #include <vector> #include <sstream> using namespace std; int main() { vector<double> ... .... 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++ - How to do remote debugging with Eclipse CDT without gdbserver?

We're using the Eclipse CDT 5 C++ IDE on Windows to develop a C++ application on a remote AIX host. ... using an SSH shell connection to gdb? 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 does the Python/C API crash on PyRun_SimpleFile?

I've been experimenting with embedding different scripting languages in a C++ application, currently I'm ... . Another terrible workaround. 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++ - Sending and receiving std::string over socket

I have seen similar question on SO but non answers my question. Here I am trying to send and recv string: I ... [-fpermissive]` on recv line! 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++ - accessing pixel value of gray scale image in OpenCV

I just want to get my concept clear that - is accessing all the matrix elements of cv::Mat means I am ... each pixel value of an image? 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++ - Programmatically adding a directory to Windows PATH environment variable

I'm writing a Win32 DLL with a function that adds a directory to the Windows PATH environment variable (to be ... at Dan Moulding's answer. 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++ - printf more than 5 times faster than std::cout?

#include <iostream> #include <cstdlib> #include <cstdio> #include <ctime> int main(int argc, char* argv[]) { ... do the exact same thing? 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++ - Class template specializations with shared functionality

I'm writing a simple maths library with a template vector type: template<typename T, size_t N> class Vector { ... any other way to solve this? 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 do static member variables affect object size?

I'm wondering how static member variables are typically implemented in languages like C++ and if their use affects ... by the linker / loader See Question&Answers more detail:os...

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

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127 views

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c++ - 2D array vs array of arrays

What is the difference between a 2D array and an array of arrays? I have read comments, such as @Dave's, that seem ... do I use arrays in C++? 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++ - Compile-time assert for string equality

Is this possible to do using templates? There are two string constants. They come from defines in different ... 0] been constand expression. 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++ - QSQLITE driver not loaded - where to put qt database driver plugins

I am using VS2008 & QT plugin to make my application. After making package when I am running the application I ... db.open(); QSqlQuery query; See Question&Answers more detail:os...

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

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332 views

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c++ - What are differences between std::string and std::vector<char>?

So what are main differences and which of them will be used in which cases? 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++ - Get argument type of template callable object

Consider the following function: template<class F> void register_handler( F& f ) // any callable object { / ... information about type T. 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::filesystem::recursive_directory_iterator with filter

I need to recursively get all files from directory and it's subdirectory, but excluding several ... :filesystem::recursive_directory_iterator ? See Question&Answers more detail:os...

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

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