Recent questions tagged C++

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I don't have my Effective C++ with me and this is bugging me so much that I have to ask for my own ... slicing problem or have I avoided 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 initialise an atomic_flag variable if it is a member of a class?

I'm trying to implement a spin lock using an atomic_flag. I know that with C++11 I have to initialise the atomic_flag ... () { m_flag.clear(); } 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 write a std::codecvt facet?

How do I write a std::codecvt facet? I'd like to write ones that go from UTF-16 to UTF-8, which go ... on how to correctly use this class? 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++ - thread destructors in C++0x vs boost

These days I am reading the pdf Designing MT programs . It explains that the user MUST explicitly call detach ... particular reason for 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++ - Visual Studio is not loading modules when attaching to process

I have a C++ application. When i press F5 in visual studio application starts and i can debug it. But when ... present there. What is problem? 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++ - "x = ++x" is it really undefined?

I am using Coverity Prevent on a project to find errors. It reports an error for this expression (The variable ... a false positive or 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++ - New option in GCC 5.3: -fno-semantic-interposition

GCC 5.3 has added a new option: -fno-semantic-interposition A new -fno-semantic-interposition option can be ... how this option works exactly? 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++ - Smooth window resizing in Windows (using Direct2D 1.1)?

It annoys me that the resizing of windows in Windows is not as "smooth" as it I'd like it to be (this ... keep up better with mouse movement). 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: transforming 3 channel image into 4 channel

I am trying to change 3-channel image into 4-channel like this: cv::VideoCapture video; video.open("sample.avi" ... someone help me? 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++ - How to use GoogleMock in Visual Studio?

This is going to be a self-answered, FAQ-style question. See answer below. With Visual Studio 2017/2019 it ... debugged via the Test Explorer. 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 throw "nothing" causes program termination?

const int MIN_NUMBER = 4; class Temp { public: Temp(int x) : X(x) { } bool getX() const { ... does compiler not raise flags during compilation? 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++ - Constexpr and SSE intrinsics

Most C++ compilers support SIMD(SSE/AVX) instructions with intrisics like _mm_cmpeq_epi32 My problem with this is ... can not be constexpr. 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++ - Matrix calculations for gpu skinning

I'm trying to do skeletal animation in OpenGL using Assimp as my model import library. What exactly do I need to ... I need to multiply it by? 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++ - C++0x decltype and the scope resolution operator

With a class such as Foo: struct Foo { static const int i = 9; }; I find that GCC 4.5 will reject the ... a piece of syntax that can help 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++ - Can I put code outside of cases in a switch?

Assume: switch ( test ) { // Set some variables, call some functions ? int x = 1 ; int y = function(x) ; ... ? I've never seen this in examples. 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++ - Cannot open include file: 'ntddk.h'

I'm been trying to get into driver development (queue the "don't do that") I have been looking at this msdn ... this: How can I solve 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++ - Immediate detection of heap corruption errors on Windows. How?

I can't sleep! :) I have a reasonably large project on Windows and encountered some heap corruption issues. I ... address space on 32-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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372 views

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c++ - How do I declare a function whose return type is deduced?

Consider this C++1y code (LIVE EXAMPLE): #include <iostream> auto foo(); int main() { std::cout << foo ... built them. The same error occurred. 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++ - "Constant expressions" prior to C++11

The constexpr keyword was introduced in C++11, as (I think) was the corresponding idea of "constant ... their definitions in 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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c++ - TR1 Shared Arrays

I've had a hard time finding references in the TR1 documentation concerning shared arrays. The Boost documentation ... []" style allocations? See Question&Answers more detail:os...

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

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566 views

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c++ - How to cout the std::basic_string<TCHAR>

I am trying to cout a basic_string<TCHAR>. But cout is throwing error. Can I know how to 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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219 views

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c++ - Is C++11 available in Visual Studio 2017?

I am currently using Visual Studio Community 2017. From looking at the C++ Language Standards in the project ... what I am doing wrong. See Question&Answers more detail:os...

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

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383 views

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c++ - Eclipse (CDT) plugin for running tests and browsing report

Google's answers (hear! hear!) and Eclipse Market Place search results on this topic simply drive me crazy! And ... any smarter guy/gal 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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527 views

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c++ - Using memcpy to copy a range of elements from an array

Say we have two arrays: double *matrix=new double[100]; double *array=new double[10]; And we want to ... using memcpy. Any quick solutions? 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++ - When linking statically, does the linker include the whole library?

For example, if I static link to freeglut, does the compiler include everything from freeglut or only the parts ... excluded in Visual Studio? See Question&Answers more detail:os...

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

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346 views

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c++ - How do I check if one of multiple macros is defined in a single #ifdef?

I have some C++ code, and want to perform an action if the __APPLE__ or __linux macros are defined. If ... using a single #ifdef statement? See Question&Answers more detail:os...

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

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448 views

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c++ - Why using QMetaObject::invokeMethod when executing method from thread

I have following code: class A : public QObject { Q_OBJECT public: A() : QObject() { moveToThread(&t); t. ... explain what is under the hood? See Question&Answers more detail:os...

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

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424 views

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c++ - Is static_cast<T>(...) compile-time or run-time?

Is static_cast<T>(...) something that gets done at compile-time or run-time? I've googled around but I got ... about reinterpret_cast<T>(...)? See Question&Answers more detail:os...

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

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