Recent questions tagged C++

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c++ - Passing one va_list as a parameter to another

I'm creating an application using the fastcgi library, and their method of printing is a little verbose. I'm ... just overload a write 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++ - How can I make Visual Studio copy the required .dll files into the release folder?

I'm using Visual Studio 2012 with C++, developing a Qt application. I'm able to compile it and debug it ... to think about copying it handmade. 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++ - Level Order Traversal of a Binary Tree

void traverse(Node* root) { queue<Node*> q; Node* temp_node= root; while(temp_node) { cout<<temp_node->value<< ... can I make this code better? 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++ - Algorithm to generate all possible arrays of ones and zeros of a given length

How can I generate all possible bit combinations in an array of bits of length n. If I start with all ... out the ones-placing approach. 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++ - Fastest way to transpose 4x4 byte matrix

I have a 4x4 block of bytes that I'd like to transpose using general purpose hardware. In other words, ... of the SSE macro _MM_TRANSPOSE4_PS. 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++ - Fast dot product using SSE/AVX intrinsics

I am looking for a fast way to calculate the dot product of vectors with 3 or 4 components. I tried several ... for the 3-element case, too. 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++ - Ensure derived class implements static method

I want to ensure, that a derived class implements a specific static method. I think doing so should be possible ... the code should be portable. 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 catch exception thrown while initializing a static member

I have a class with a static member: class MyClass { public: static const SomeOtherClass myVariable; }; Which I initialize ... so I can log 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++ - private copy constructor/assignment operator and copy-initialization

This is a followup of this question in the following code, why does line 1 compiles while line 2 and 3 does not ... ), but why line 1 does. 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++ - Comparing floats in their bit representations

Say I want a function that takes two floats (x and y), and I want to compare them using not ... in their respective unsigned int counterparts? 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++ - __cdecl, __stdcall and __fastcall are all called the exact same way?

I am using Visual C++ 2010, and MASM as my x64-Assembler. This is my C++ code: // include directive ... all be called the exact same way? 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 handle keypress events in a Qt console application?

For example, that when you press "Esc", the application ends. See Question&Answers more detail:os...

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

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272 views

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c++ - Boost threads: in IOS, thread_info object is being destructed before the thread finishes executing

Our project uses a few boost 1.48 libraries on several platforms, including Windows, Mac, Android, and IOS. ... "dmb" 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++ - Compiler reordering around mutex boundaries?

Suppose I have my own non-inline functions LockMutex and UnlockMutex, which are using some proper mutex - such ... out to simplify the example. 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 map from two vectors

If I have two stl vectors vect1, vect2 and I want to produce from them a map, so first element from vect1 will ... that in the most simple way? See Question&Answers more detail:os...

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

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392 views

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c++ - Overhead of DLL

I have a quite basic question. When a library is used only by a single process. Should I keep it as a static ... **What will be the overhead?* 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++ - OpenMP offloading to Nvidia wrong reduction

I am interested in offloading work to the GPU with OpenMP. The code below gives the correct value of sum on ... , along with gcc-offload-nvptx See Question&Answers more detail:os...

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

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306 views

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c++ - How to clear a process command line?

I would like to clear the command line of my process from within. For example, when viewing my process ... restarting the process if 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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613 views

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c++ - Undefined reference to 'inflateInit2_'

I'm using Code Blocks IDE and I want to install Tiled Map Editor for SFML. So, I downloaded the source and ... anyone know how to fix 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++ - How do I execute QTcpSocket in a different thread?

How do I execute QTcpSocket functions in a different 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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298 views

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c++ - CUDA function call-able by either the device or host

I have a re-useable function in some CUDA code that needs to be called from both the device and the host. Is ... host. Is there a better way? See Question&Answers more detail:os...

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

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454 views

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c++ - Defining constexpr static data members

So, I'm aware that in C++ static members can be initialized inside the class if they are a const literal type ... :stc; Why is this the case? 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 std::basic_ios overload the unary logical negation operator?

The C++ IO streams' base class std::basic_ios defines operator void*() to return !fail() and operator!() ... didn't bring any answers either. See Question&Answers more detail:os...

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

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679 views

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c++ - Compilation errors for C++17 <filesystem> on MinGW

I want to play around with the new filesystem library that's now apart of the C++17 standard, however I can't ... doesn't work for me. 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++ - How is dynamically allocated space freed when a program is interrupted using Ctrl-C?

Given the following code: #include <stdio.h> int main() { int *p; p = (int *)malloc(10 * sizeof(int)); ... Of C++, done using the new operator? See Question&Answers more detail:os...

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

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760 views

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c++ - use std::bind with overloaded functions

I cannot find out how to bind a parameter to an overloaded function using std::bind. Somehow std::bind cannot ... Any help is much 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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423 views

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c++ - Load a png resource into a CBitMap

How do I load a png resource into a CBitMap? When I try this it doesn't seem to work: CImage image; image. ... other way to load a PNG resource? 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++ - RVO force compilation error on failure

Lots of discussions here about when RVO can be done but not much about when it is actually done. As ... actually enforced by the standard. See Question&Answers more detail:os...

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

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