Recent questions tagged c++

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c++ - How to set background color of QComboBox button?

Version/Environment: Windows 10 64 bit Qt 5.11.0 MSVC2017 64 bit I have a simple QComboBox to enable/disable a ... an image of what i want: 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 "End Task" from Windows Task Manager on a background process?

I wrote a simple test program (TestProgram.exe) to learn how to handle the CTRL_CLOSE_EVENT and here are my ... Task Manager). Thanks, Krishna 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++ - Concatenating integers to const char* strings

I have a few files named like so: file1, file2, file3, etc. I have a function: load(const char *file) which I ... Is there a way of doing 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++ - Checking for bit flags

I'm trying to check for a bit in a flags value of which flags can be |'d together. So far i'm using this ... a more "elegant" way of doing 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++ - Eigen: replicate items along one dimension without useless allocations

I have some vector vec and i want to obtain a new "expression" vec2 by copying values along dimension of ... module PS Sorry for my English 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++ - Merge bit sequences a and b according to a mask

According to the bit twiddling hacks website, the operation unsigned int a; // value to merge in non- ... operation on some instruction 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++ - How to map texture to sphere that rendered by parametric equation using points primitive

Is it possible to map texture to Sphere that are generated by parametric equation and rendered using GL_POINTS primitive ... just to clarify 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++ - Do I need to use _mm256_zeroupper in 2021?

From Agner Fog's "Optimizing software in C++": There is a problem when mixing code compiled with and ... _mm256_zeroupper() calls 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++ - Derived class inherit base class assignment operator?

It seems to me that Derived class don't inherit base class Assignment operator if Derived class inherit Base class ... the base class 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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c++ - Qt menubar not showing

I'm building a simple C++ application on Mac OS X 10.9 with Qt 5.2.1 using CMake (without MOC). ... MacExtras) Thanks a lot 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++ - Visual Studio Debugger displays wrong values for native types

I am writing a program in managed C++ and native C++ using Visual Studio 2008 (Version 9.0.30729.1 SP) ... a screenshot to clarify what I mean: 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 - c++/cli wrapper question

Is there a recommended way to wrap a native c++ library by c++ cli? 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++ - Confused with pdpotrf arguments

I want to do a Cholesky factorization in a distributed environment. For that purpose, I use pdpotrf(). However, I ... I do not know any Fortran. 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 configure what .NET version should be installed by windows installer in VS 2017

Currently I am working on a project that needs .NET 4.0 to work properly but when I configure the ... ++ Redistributable in my installer. 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 do templates allow constexpr function members with non-constexpr constructors?

Using C++14. Why will this compile: template<unsigned N> constexpr bool foo() { std::array<char, N> ... a constant expression return 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++ - QSystemTrayIcon and Windows8

I writing app and have strange bug in tray class. Inside my class I using QSystemTrayIcon like tray = new ... use Qt5.1.1 MSVC 2012 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 get UTC seconds since epoch till midnight

I have to instantiate an object of a custom library class that takes nanoseconds since 'epoch' in UTC time ... . I appreciate your clues 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 get platform IDs from boost?

How can we know which operating system the code is running? e.g. How to know the operating system like Unix- ... test with Boost v1.41 onwards. 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++ - List-initialization priority from object of same type

#include <iostream> #include <initializer_list> using namespace std; struct CL { CL(){} CL (std:: ... Whose behavior is correct? 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++ - cvSnakeImage() OpenCV API example/documentation

Can anyone refer me any tutorial/documentation on how to use cvSnakeImage(). I have refered this link but example ... how to use cvSnakeImage(). 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 operator=() with callback

I have a template Property which wraps a data and provides other services. This template is specialized for basic ... relevant for my 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++ - copying c array of strings into vector of std::string

I need to store elements of a c array of strings in a vector. Basically I need to copy all the elements of a c ... it++<<endl; } getch(); } 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++ - Memory management issue with deleting QQuickView in Qt5.3(mingw32)

We are developing an application with Qt/Qml (Qml is embedded in the QWidget). When deleting a QWidget that ... code. 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++ - alias of a function template

I have created a CPU dispatcher which compiles the same functions with different compile options into ... template function declarations? 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 char* from function not working

Visual studio c++ shows that "string" on line 24 has one array element, but the top contains all the text that ... (); PutString( string ); } See Question&Answers more detail:os...

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

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863 views

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c++ - seekg() function fails

I am trying to write some simple code which will read a text file but reads the first line twice. I ... code above to simplify the discussion. See Question&Answers more detail:os...

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

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796 views

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c++ - extending 'incomplete' types (SWIG)

I'm looking for a way to extend (i.e. add new members to a type using the %extend directive) a type that ... finds one. Many 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++ - Inheriting copy and move constructors of base class using "using" keyword

I want to inherit copy constructor of the base class using using keyword: #include <iostream> struct A { ... copy and move constructors. See Question&Answers more detail:os...

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

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