Recent questions tagged C++

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c++ - How to access variables in different class from other class?

Let just say that we have two classes, A and B. Here is code for both of them class A { public: int ... because of this line SubMenu.resize(3); 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++ - USB Programming with Qt

Is there anyway I can do USB programming in Qt? I am using Qt Creator 2.6 which is based on Qt version 5.0 ... OS is windows 7 ultimate 32 bit. 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++ - Constructing and sending binary data over network

I am creating a command-line client for minecraft. There is a full spec on the protocol that can be found ... the modified UTF-8 yet though. 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 Read the certificates file from the PKCS7.p7b certificate file using openssl?

I am getting PKCS7 file (p7b). I want to read the content of the file and extract certificate in X509 ... PKCS container using openssl library? 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++ - GCC --gc-sections and finding symbol dependencies

I'm trying to reduce the size of my elf executable. I'm compiling with -ffunction-sections -fdata-sections and ... .ld Thanks 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++ - Virtual inheritance doesn't break static composition?

I was working the last 5 years with the assumption that virtual inheritance breaks static composition. But now I ... instance. Is this right? 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++ - Calling function in injected DLL

I want to call a function in a remote process of an injected DLL that I've made. I have successfully injected ... crash. How can I 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++ - cin.getline( ) with larger size

#include<iostream> using namespace std; int main() { char test[10]; char cont[10]; cin.getline(test,10); ... is empty. Could someone explain 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++ - Detect insertion of media into a drive using windows messages

I am currently using WM_DEVICECHANGE to be notified when new USB drives are connected to the computer. This works ... having to use polling? 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 lambda callbacks without Y Combinator

I wish to create a callback that recursively returns itself as a callback. The suggested method to recurse is ... and then segmentation faults. 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 direct-initialization or copy-initialization?

Initializing objects (instances of classes or structs) in C++ can be done in various ways. Some syntaxes evoke ... of a non-optimizing 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 generate random permutations with CUDA

What parallel algorithms could I use to generate random permutations from a given set? Especially proposals or links to papers ... 6, ..., 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++ - Direct list initialization compiles successfully, but normal direct initialization fails, why?

For example, code like this: struct A { A(int); }; struct B { B(A); }; int main() { B b{{0}}; // OK B ... ^ f.cc:2:8: note: constexpr B::B(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++ - Vector as a class member

Hello I have this question: I would like to have a vector as class member. This is perhaps my question easier for ... on this i have a error } 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++ - Suppress output to cout from linked library

I need to link my C++ programs against a couple shared libraries which generate way too much output to std::cout ... , libtool, ld) under Linux. See Question&Answers more detail:os...

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

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319 views

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c++ - Use Windows built in MP3 decoder to play audio?

How do I from C or C++ use the MP3 decoder supposedly built in with Windows since Windows Media Player 6.1 ... them a lot. Related question. 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++ - Shuffling by mask with Intel AVX

I'm new to AVX programming. I have a register which needs to be shuffled. I want to shuffle several bytes ... depth? Thanks in advance for 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++ - Why and when shouldn't I kill a thread?

I am writing a multithreaded socket server and I need to know for sure. Articles about threads say that I ... they crash the whole application? See Question&Answers more detail:os...

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

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284 views

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c++ - Compare versions as strings

Comparing version numbers as strings is not so easy... "1.0.0.9" > "1.0.0.10", but it's not ... elegantly"? For example, boost::string_algo... 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++ - Sieve of Eratosthenes algorithm

I am currently reading "Programming: Principles and Practice Using C++", in Chapter 4 there is an exercise ... would be 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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287 views

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c++ - How can I print a newline without flushing the buffer?

I was experimenting with c++ trying to figure out how I could print the numbers from 0 to n as fast ... times show no significant difference. See Question&Answers more detail:os...

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

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319 views

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c++ - How to find where to cast a ray to avoid collision in Bullet?

Say we have an object at point A. It wants to find out if it can move to point B. It has limited velocity ... to find optimal in some vay path? 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++ - Clear boost::asio::io_service after stop()

I am using (single threaded) a boost::asio:io_service to handle a lot of tcp connections. For each connection ... g. remove all queued handlers? 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++ - GetFullPathNameW and long Windows file paths

In the Windows version of my current personal project, I'm looking to support extended length filepaths. As a ... filepath resolution on my own? 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 the semantics of `std::memory_order_acquire` requires processor instructions on x86/x86_64?

It is known that on x86 for the operations load() and store() memory barriers memory_order_consume, ... /VisualStudio/feedback/details/770885 See Question&Answers more detail:os...

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

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170 views

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c++ - What is definition of reference type?

How do you define (explain) in a formal and strict way what is reference type in C++? I tried to ... see definition of this concept there. See Question&Answers more detail:os...

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

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259 views

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c++ - Best strategy for profiling memory usage of my code (open source) and 3rd party code(closed source)

I am soon going to be tasked with doing a proper memory profile of a code that is written in C/C++ and ... be run in a linux environment. 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++ - Remove #pragma once warnings

I am using #pragma once in my .cpps and .hpps and because of that I get a warning for each file that uses it. I ... in GCC, that I do not know? See Question&Answers more detail:os...

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

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