Recent questions tagged C++

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c++ - error WinSock.h has already been included Boost Windows Qt

I am using boost lib on Qt creator to develop an application, my platform is Windows8 MSVC2013 64. I have ... will be appreciated. Thanks Haris 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 generate a fusion map from an adapted struct?

Let A be: struct A { int a; std::string b; struct keys { struct a; struct b; }; }; I would like to ... haven't found a way to do this 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++ - Qt No such slot for the QProcess::finished() signal

I am trying to run a command line program, gphoto2 from my Qt app running in Linux and read the results ... ->pushButton->setEnabled(true); } 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++ - definition of static const outside the class definition

Should we define a static const member outside of the class definition even if it is initialised inside the ... one is standard compliant? 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++ - Ambiguous call to overloaded function 'pow'

I'm having some problems runnning the following code. I got this: error C2668: 'pow' : ambiguous call to overloaded ... I fix this? Thank you. 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.get() not working

I wrote this simple program today, but I found that cin.get() refuses to work unless there are 2 of them. ... version of bloodshed c++ dev 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++ - Errors in std::make_shared() when trying to make shared_ptr?

(Using Visual Studio 2010) I'm trying to create a shared_ptr of an existing class in my project (class was ... (independent of Foobar and Baz). 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++ - Refusing connection from a host

I'm writing a simple tcp server application using sockets. As far as I know I can obtain the client's ... connection attempt from a host? 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++ - Keeping std::list iterators valid through insertion

Note: This is not a question whether I should "use list or deque". It's a question about the validity of ... track a position in a deque?) 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 OK to reference an out-of-scope local variable within the same function?

In this code, I reference the local variable b even though it is out of scope. But I do it from within the same ... } std::cout << *a; } 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 converting between pointer-to-T, array-of-T and pointer-to-array-of-T ever undefined behaviour?

Consider the following code. #include <stdio.h> int main() { typedef int T; T a[] = { 1, 2, 3, ... edited the code to reflect these changes. 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++ - Strict aliasing rule

I'm reading notes about reinterpret_cast and it's aliasing rules ( http://en.cppreference.com/w/cpp/language/ ... so is this cast incorrect? 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++ - openCV 3.0.0 cv::vector missing

I'm upgrading from opencv 2.4.11 to 3.0.0 I have used cv::vector in my code <br> but now I get ... removed or just moved to another header file? 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++ - Alternatives to MS strncpy_s

What are some alternatives to the Microsoft security enhanced functions such as strncpy_s or _itoa_s? Although ... to other platforms. 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++ - building android project produces make error 2

I have recently purchased a book to assist in my development of C++ for Android which contained some code samples. ... 'C: dkandroid-ndk-r9'. 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++ - Multiple Definition of "..." c

I have a header file "USpecs.h": #ifndef USPECS_H #define USPECS_H #include "Specs.h" #include <iostream> #include < ... #ifndef but it is not. 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_lock_free() returned false after upgrading to MacPorts gcc 7.3

Previously, with Apple LLVM 9.1.0, is_lock_free() on 128-bit structures have returned true. To have complete std: ... what I may be missing? 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 templates work, are they always inlined?

I can understand how it work if they are inlined. But if they are not, how does it work? does all ... for example the function template anyway? 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 declare New-Signal-Slot syntax in Qt 5 as a parameter to function

How can I pass signal or slot (member-function, new syntax in Qt 5) as a parameter to function and ... signals to this function for connection? 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 let a C++11 thread run several different functions?

I am learning the new multi-threading techniques in C++11. Almost all the tutorials I read on the web is teaching how ... t1.join(); 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++ - SetConsoleMode() and ENABLE_VIRTUAL_TERMINAL_PROCESSING?

According to MSDN, the dwMode parameter for the SetConsoleMode() function should allow ENABLE_VIRTUAL_TERMINAL_PROCESSING ( ... MSDN article. 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++ - char val = 'abcd'. Using multi character char

I have a confusion of how the compiler handles a char variable with multiple characters. I understand that a char ... Studio 2013. Thank you. 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++ - boost compressed_pair and addresses of empty objects

AFAIK, boost::compressed_pair is supposed to ensure that the address of the first and second memebrs are different ... , &same_pair.second()); 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++ - Parallelisation in Armadillo

The Armadillo C++ linear algebra library documentation states one of the reasons for developing the library in C++ ... answer to this 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++ - OpenCV: how to set alpha transparency of a pixel

I have an image I am trying to segment by colouring each pixel either red green or blue. I have ... the image just fully transparent. 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 virtual method from destructor - workaround?

I need to declare finalizing method finalize() for all descendants of the base class Base, that should be called ... it in a documentation? :) 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++ - Setting a DWORD value in the registry

I'm trying to set a DWORD value in the registry. I made it work with a text value, but now I want to set ... (I'm not creating a new one). 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::filesystem::path::append replace the current path if p starts with root path

Given below code: #include <iostream> #include <filesystem> namespace fs = std::filesystem; int main() { fs:: ... path with append() 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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