Recent questions tagged C++

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c++ - Passing lambdas to std::thread and calling class methods

I'm having a bit of trouble using std::thread together with lambdas. I have a method TheMethod where I should ... pthread too. Thanks 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++ - Separate test cases across multiple files in google test

I'm new in google test C++ framework. It's quite easy to use but I'm wondering how to separate the cases ... does nothing... Any help is welcome 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 programmatically set volume in Windows, Mac and Ubuntu?

I'd like to programmatically set volume in Windows, Mac and Ubuntu using C/C++. Command line also can but C/C++ preferred. Thank you 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++ - const and global

This code will produce error in c++ // Foo.cpp const int Foo = 99; // Main.cpp extern const int Foo; ... page it is spoiling my all intuitions.. 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 unicode file with special characters using std::wifstream

In a Linux environment, I have a piece of code for reading unicode files, similar as shown below. However, ... whole line? Thanks and regards 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++ - Undefined behaviour of const

I never thought I will be going to ask this question but I have no idea why this happens. const int a = ... where is the second value stored? 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 destructor is not called implicitly in placement new"?

As referenced in this site... http://www.parashift.com/c++-faq-lite/dtors.html#faq-11.10 But i did ... we should explicitly call the desturctor? 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++ - Executing a method on ui thread due to an event on background thread

I've got a background thread that is polling a server. When there's data, I want to handle the data on ... modify anything in the message loop. 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++ - Atomic operations for lock-free doubly linked list

I am writing a lock-free doubly linked list based on these papers: "Efficient and Reliable Lock-Free Memory ... and swap mPointer of Link) 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 all template instantiations created at compile time?

After learning about variadic function templates that use recursion, I am wondering: Are all template instantiations that ... on-the-fly? 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++ - Get SVM classification score in multiclass classification with OpenCV

I'm working on a project where I'm doing multiclass classification with SVM in OpenCV. My goal is to get ... . Thanks for any input provided. 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++ - Doubling buffering in CUDA so the CPU can operate on data produced by a persistent kernel

I have a Monte Carlo simulation in which the state of the system is a bit string (size N) with the bits being ... answer for a CUDA/C++ 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++ - What is the complexity of std::string::substr member function?

What is the complexity of std::string::substr member function? Is it defined by standard or implementation-defined? 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++ - Template partial specialization

Would any one knows according to what rules code below doesn't compile? template <class T> struct B { typedef ... see comment inside the 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++ - What is the idiomatic C++17 standard approach to reading binary files?

Normally I would just use C style file IO, but I'm trying a modern C++ approach, including using the C++ ... about right? Can this be improved? 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++ - Eclipse debugging with input from console

I'm trying to debug a program I wrote in C++ using Eclipse. The program includes getting input from the user ... fclose(inputFile); return 0; } 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++ cli - How do I convert a System::String^ to const char*?

I'm developing an app in C++/CLI and have a csv file writing library in unmanaged code that I want to use from ... )) ) { // report success } 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++ - Returning variadic aggregates (struct) and syntax for C++17 variadic template 'construction deduction guide'

Using a template struct such as many below, it's possible to return a fixed set of possibly unmovable objects, and ... -> many<Args...>; 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++ - Inline functions and external linkage

In this answer https://stackoverflow.com/a/4193698/738811 it's written that "Inline functions by default ... functions have external linkage? 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++ - Purpose of --enable-auto-import Warning

I am trying to compile the following program: #include <iostream> int main(){ std::cout << "Hello, world ... .20100613 Windows XP Service Pack 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++ - Fusing a triangle loop for parallelization, calculating sub-indices

A common technique in parallelization is to fuse nested for loops like this for(int i=0; i<n; i++) { for(int j=0; j<n ... : %d %d ", x,i,j); } } 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 does the pimpl idiom reduce dependencies?

Consider the following: PImpl.hpp class Impl; class PImpl { Impl* pimpl; PImpl() : pimpl(new Impl) { } ... terms of not recompiling client 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++ - scanf() curious behaviour!

I recently stumbled upon a curious case(atleast for me, since I hadn't encountered this before)..Consider the simple ... explain this to me.... 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 compare two objects (the calling object and the parameter) in a class?

I am writing a "Date" class for an assignment and I am having trouble doing one the of the functions. This ... (d2) Thank you 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++ - Display the plot values on mouse over. - Detect Scatter points

I am attempting to display the plot values of different points on my QCustomPlot in which I have a Line style of ... is over a scatter point ? 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++ - Deducing a function pointer return type

I think code will better illustrate my need: template <typename F> struct return_type { typedef ??? type; }; ... long as supported in VS2012). 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++ - GetDC(NULL) gets primary monitor or virtual screen?

Looking around the net I see that most people think that GetDC(NULL) will get a device context for the entire ... )); ReleaseDC(NULL, hdc); 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++ - UnixTime to readable date

What is the best way to convert UnixTime to a date? Is there a function for it or an algorithm? See Question&Answers more detail:os...

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

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