Recent questions tagged C++

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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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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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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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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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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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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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296 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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387 views

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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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c++ - Overallocating with new/delete

Using malloc and free, it is easy to allocate structures with extra data beyond the end. But how do I accomplish ... } Output: hamburger is yum See Question&Answers more detail:os...

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

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602 views

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c++ - Qt creator Adding external library (still: Cannot open include file: 'GL/glew.h')

I followed the instruction: In the Projects pane, open the project file (.pro). Right-click in the code editor ... ': No such file or directory 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++ - shared_ptr and cyclic references

I was trying with the cyclic references for boost::shared_ptr, and devised following sample: class A{ // ... required? 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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379 views

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c++ - BitBlt performance with Aero enabled

I'd like to get more performance out of BitBlt for capturing the screen. When Aero remains enabled, capturing ... screen when Aero is disabled. See Question&Answers more detail:os...

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

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214 views

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c++ - Using make to move .o files to a separate directory

I've tried numerous attempts to move my .o files to my obj folder, but no matter what I do, it simply just ... (INCLUDEPATH) -c main.cpp $(OBJ) See Question&Answers more detail:os...

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

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357 views

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c++ - How to specify target mac os x version using qmake

I am trying to compile c++11 code on the Mac OS X using Qt Creator/qmake and I am getting the ... Any suggestions would be helpful. 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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231 views

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c++ - Access Base class variable from child class method

How can I access base class variable from a child method? I'm getting a segmentation fault. class Base { public: ... Child(); child->foo(); See Question&Answers more detail:os...

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

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323 views

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c++ - CreateProcess succeeds, but GetExitCodeProcess returns C0000142

I'm trying to start a user-mode process from a service using CreateProcessAsUser() API similar to this code. ... code 0xC0000142. Any idea why? See Question&Answers more detail:os...

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

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364 views

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c++ - Compile header-only template library into a shared library?

We are in the process of designing a new C++ library and decided to go with a template-based approach ... but also the partial specialisations.. See Question&Answers more detail:os...

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

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256 views

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c++ - Converting an Integer Array into a Number

Think I have an integer array like this: a[0]=60; a[1]=321; a[2]=5; now I want to convert the whole ... after running the code. How to do 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++ - Different template syntax for finding if argument is a class or not

While reading this question , I came across @Johannes's answer. template<typename> struct void_ { typedef void type; ... parameter in Line 2 ? See Question&Answers more detail:os...

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

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438 views

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c++ - How to generate 64 bit random numbers?

I'm implementing universal hashing and using the following universal hash function : h(k)=((A*k)mod 2^64) ... number returned by rand is int. See Question&Answers more detail:os...

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

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