Recent questions tagged C++

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c++ - Factory pattern allocating memory at compile time, and how to print compile time info

I am using the factory pattern. It basically allows classes to be registered at compile time and stored in a ... names as they get registered ? 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++ - Which io_context does std::boost::asio::post / dispatch use?

While using boost::asio 1.66 I read in the documentation that boost::asio::io_context::post is deprecated for ... of a boost::asio handler. 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 memory_order_relaxed and memory_order_seq_cst make no difference?

I was playing with one of the examples in C++ Concurrency in Action which uses std::memory_order_relaxed for ... of running under VMWare? 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++ - Force function to be called only with specific types

I was looking at enforcing type safety when casting char* to bool in C++11 and it was suggested that ... it unspecified or undefined behavior? 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++ - Using Boost unordered_map

I want to include boost::unordered_map in my project without downloading the whole Boost package. How can I do that? 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 catch a segfault with try/catch?

I did this test to see what happened: try { int *x = 0; *x = 1234; } catch(...) { cout << "OK ... segfault, why does it not catch the segfault? 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 good habit to always initialize objects with {}?

Initializing objects with new {} syntax like this: int a { 123 }; has benefit - you would not declare a ... a way to avoid such problems? 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++ - Are non-static non-reference data member declarations variables?

I want to reshoot a question based on the answer and appending discussion of: Why is a non static data member ... example in the 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++ - QThread and QTimer

I'm working on an application developed with Qt 4.6. I want to create a custom timer that counts in a separate ... to a problem (see 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++ - Force constexpr to be evaluated at compile time

#include <algorithm> struct S { static constexpr int X = 10; }; int main() { return std::min(S::X, 0); }; ... , i.e. letting it be a 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 to keep a QWidget (or QDialog) centered to its parent widget?

I want to keep a QWidget (or QDialog) centered to its parent widget. Is it really required to connect to ... easier way (something to set)? 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++ - Client authentication (certificat + private key) using WinInet

This is an evolution of my previous question, which was about WinHttp. I hope this is the right way to do this ... stuff... 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++ - Operator overloading for lambdas?

I have asked a similar question before overloading operator >> for lambdas But i did not explained what i really wanted ... weight << endl; }); 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++ - Initialize a variable

Is it better to declare and initialize the variable or just declare it? What's the best and the most ... good to initialize the variable? 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 implement a lambda function for a sort algorithm involving object members, indirection, and casting?

I'm working on some code and I have a section where I do a one off sort function. To implement it I ... function. Thank you for your 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++ - Error trying to find const char* key from std::map

I have a map declared like this: std::map<const char*, const char*> map2D; The map is filled by the ... char*. Can anyone further clarify 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++ - Array Assignment

Let me explain with an example - #include <iostream> void foo( int a[2], int b[2] ) // I understand that, ... main(). Want to know the reason. 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 is OpenMP outperforming threads?

I've been calling this in OpenMP #pragma omp parallel for num_threads(totalThreads) for(unsigned i=0; i<totalThreads ... , it takes 100 seconds. 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 os x failure ar no archive members specific

I have a simple cmake project going that I can't get to compile on OS X 10.8.4. The ... {ITK_LIBRARIES}) TARGET_LINK_LIBRARIES(IST ImageFilter) 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 disable printf function?

I have three files as below Test.cpp void helloworld() { disable pf; pf.Disable(); printf("No statement "); ... am calling it from a 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++ - overloading assignment operator With subscript operator

I overloaded both subscript operator and assignment operator and I am trying to get right value to assignment operator example ... x[0]<<endl; } See Question&Answers more detail:os...

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

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546 views

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c++ - I want to pack the bits based on arbitrary mask

Let's say that data is 1011 1001 and the mask is 0111 0110, then you have: input data: 1011 1001 input mask: 0111 ... , 16, 32, 64 and 128 bits. 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++ - GLEW and glfw compile error: undefined reference to symbol 'XConvertSelection'

I'm trying to compile this code: #include <stdio.h> #include <stdlib.h> #include <GL/glew.h> #include < ... file: http://pastebin.com/yhkV7nn7 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++ - Read environment variables from a process in C#

I want to read the environment variables of process B from C# code in process A. I have seen some solutions for ... wrapped a C++ solution yet? 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++ - Same strings in array have same memory address

Why do same strings in a char* array have the same address? Is this because of compiler optimization? Example: #include ... , %p " 0x400823: "" See Question&Answers more detail:os...

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

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535 views

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c++ - Cmake + CUDA + OpenCV

I have a working C++ project that uses OpenCV. I am creating a CMakeLists.txt file to help people compile it, ... the good function. Any idea? See Question&Answers more detail:os...

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

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508 views

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c++ - Is there any OpenSSL function to convert PKCS7 file to PEM

Is there any openssl api function to convert PKCS7 file to PEM. I am able to convert a PKCS12 file to PEM ... p7 = d2i_PKCS7_fp(cafp, NULL); See Question&Answers more detail:os...

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

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336 views

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c++ - How can I Initialize a div_t Object?

So the order of the members returned from the div functions seems to be implementation defined. Is quot the 1st ... platform way to do 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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