Recent questions tagged C++

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c++ - How to read an UTF-8 encoded file containing Chinese characters and output them correctly on console?

I am writing a web crawler to fetch some Chinese web files. The fetched files are encoded in utf-8. And ... system is Win8 in Chinese Language; 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++ - Is it possible to create a winapi window with only borders

So I'm trying to create a window that only shows its borders and have the rest of the body be see through. ... the desired effect. Any ideas ? 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++ - Linux equivalent for conio.h getch()

Previously I use c++/c compilers on windows which support the #include <conio.h> header file but on Linux ... the character on the console. 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++ - Move Constructor vs Copy Elision. Which one gets called?

I have two pieces of code here to show you. They are two classes and each one provides a Move Constructor ... of optimizations by the 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++ - How to mock library calls?

New to cpp (Java guy). I have 3rd party library that has method sendMail(txt). I don't want to test the ... mock a call in my tested method. 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 use visual studio code to compile multi-cpp file?

I have followed some instructions to construct Visual studio code C/C++ compile and debug environment.But g++ ... FFMpeg .h file correctly. 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++ - C++11 auto and function return types

I know of the difference between auto, auto&, const auto and const auto& (for example in a "for each" loop), ... the return value of the fun()? 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 access an index of an std::stack

void PDA::parse(vector<string> words){ for(int i=0; i<words.size();i++){//for each string in the ... stack should work just fine. Any ideas? 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++ - GLIBCXX_3.4.9 not found when running ffmpeg from php in lampp server

I've written a php program which creates a video from sequence of images using ffmpeg. <?php $res = shell_exec(" ... in php? Thanks in advance. 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++ - Implementation of getline ( istream& is, string& str )

My Question is very simple, how is getline(istream, string) implemented? How can you solve the problem of ... ] or another neat structure? 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++ - Not locking mutex for pthread_cond_timedwait and pthread_cond_signal ( on Linux )

Is there any downside to calling pthread_cond_timedwait without taking a lock on the associated mutex first, and ... locking the mutexes first. 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++ - CUDA kernel as member function of a class

I am using CUDA 5.0 and a Compute Capability 2.1 card. The question is quite straightforward: Can a ... not strategies for structured 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++ - Boost advocacy - help needed

Possible duplicates Is there a reason to not use Boost? What are the advantages of using the C++ BOOST ... not merely wonderful feelings :) 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++ - can you set SO_RCVTIMEO and SO_SNDTIMEO socket options in boost asio?

can you set SO_RCVTIMEO and SO_SNDTIMEO socket options in boost asio? If so how? Note I know you can use ... these socket options in particular. 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 switching from Mersenne twister to other PRNGs in Gradient Noise Generator give bad results?

I've been trying to create a generalized Gradient Noise generator (which doesn't use the hash method to get ... others were 256 by 256) 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++ - Example of error caused by UB of incrementing a NULL pointer

This code : int *p = nullptr; p++; cause undefined behaviour as it was discussed in Is incrementing a ... when incrementing a null pointer ? 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++ - CMake: how to add Boost.Test cases with relative directories?

I have a working project with CMake and Boost.Test with a directory structure like this (pardon the ASCII art): ... }/${test_id}) endforeach() 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++ - multiple arguments to CreateThread function

When I use the CreateThread API method, what do I need to do when I want to pass more than one parameter where LPVOID lpParameter is passed? 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++ - Apply the first valid function of a set of N functions

This previous answer shows how to apply function based on the validity of a call: here. However, it applies to two ... +14, and if so, how? See Question&Answers more detail:os...

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

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365 views

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c++ - How do I take ownership of an abandoned boost::interprocess::interprocess_mutex?

My scenario: one server and some clients (though not many). The server can only respond to one client at a ... abandoned, take ownership of 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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300 views

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c++ - Using Mat::at(i,j) in opencv for a 2-D Mat object

I am using Ubuntu 12.04 and OpenCV 2 I have written the following code : IplImage* img =0; img = cvLoadImage ... isnt. What is going wrong here? 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++ - Divide-and-conquer algorithm for finding the majority element?

An array is said to have a majority element if more than half of its elements are the same. Is there a divide ... return mElement; return -1; } 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 whether the code is running on the GPU or CPU

Does anybody know how to check whether the code is running on the GPU or CPU using Cuda? __device__ __host__ ... { use_cpu_variables(); } } 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++ - Building a Custom Expression Tree in Spirit:Qi (Without Utree or Boost::Variant)

First of all, if it is much easier using either Boost Variant or Utree, then I will settle with them, and ... make it as readable as possible. See Question&Answers more detail:os...

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

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305 views

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c++ - operator overloading, member and non-member function, which one has priority?

Say I have a Complex number class and operator+ is overloaded twice, both as a member function and as a ... function will be called? 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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209 views

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c++ - Visual Studio 2008 with c++11

Can I somehow make Visual C++ 2008 to have C++11 library and use all the good things C++11 standard allows? 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++ - Linking troubles with boost::program_options on OSX using LLVM

I'm having trouble getting through the linking phase in my C++ program due to problems with Boost 1. ... though. Pointers 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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500 views

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c++ - QSerialPort readLine() extremely slow compared to readAll()

The data I'm reading from a serialport (in Qt, using QtSerialPort/QSerialPort) is separated by the newline ' ' ... not yet seen answered here. See Question&Answers more detail:os...

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

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