Recent questions tagged C++

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c++ - Direction of shortest rotation between two vectors

my question is regarding working out the direction of the smallest angle between two vectors in 2D. I am making a ... the chance to say thanks. 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 write directly to linux framebuffer?

How to write directly to linux framebuffer? 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 will be the critical section code for a shared queue accessed by two threads?

Suppose we have a shared queue (implemented using an array), which two threads can access, one for reading ... potential problems can occur? 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++ - QThreads , QObject and sleep function

The problem I encountered is that I decided to implement QThreads the way they are supposed to, based on numerous ... to go faster or slower. 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 point of the 'auto' keyword?

So I understand using var in C# makes sense because you have anonymous types that are compiler derived. C++ ... to justify its existence). 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 should I use vector<int>::size_type instead of size_t?

In this question I see following: for (vector<int>::size_type ix = 0; ix ! = ivec.size(); ++ix) { ... vector<int>::size_type instead of size_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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c++ - Calculate the area of an object with OpenCV

I need to calculate the area of a blob/an object in a grayscale picture (loading it as Mat, not as ... the coordinates of the contour 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 is Teamviewers Quickconnect button accomplished?

For those of you who do not know what I am talking about: http://www.teamviewer.com/images/presse/quickconnect_en. ... if there are any. Thanks. 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++ - printing stl containers with gdb 7.0

I have installed GDB 7.0 and python per the following instructions. In the same manual, there is a mention of ... me all of this work? Thanks 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++ - Obtaining command line arguments in a Qt application

The following snippet is from a little app I wrote using the Qt framework. The idea is that the app can ... line args in my application? 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 link a shared library with CMake with relative path

I want to link a third-party libLibrary.so and distribute it with my program. If user unzips my archive, ... path relative instead of absolute? 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 copy (or swap) objects of a type that contains members that are references or const?

The problem I am trying to address arises with making containers such as an std::vector of objects that contain ... like this will work 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++ - Horizontal minimum and maximum using SSE

I have a function using SSE to do a lot of stuff, and the profiler shows me that the code portion ... are highly appreciated :) Thanks 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 print a double with a comma

In C++ I've got a float/double variable. When I print this with for example cout the resulting string is period- ... .1415 << endl $> 3,1415 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++ - Capturing video out of an OpenGL window in Windows

I am supposed to provide my users a really simple way of capturing video clips out of my OpenGL application's main ... free to take your time :) 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 install and build against OpenSSL 1.0.0 on Ubuntu?

You can consider this a follow-up question to How do I install the OpenSSL C++ library on Ubuntu? I'm ... lcrypto, and the errors went away. 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 do the values of the mask parameter returned by findHomography represent?

I am using the function findHomography of OpenCV with the RANSAC method in order to find the homography that ... >setText(Mat2QString(mask)); 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 shared_from_this and multiple inheritance

I am currently having some troubles when using boost enable_shared_from_this and multiple inheritance. The scenario can be ... Visual C++ 2010. 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++ - QSslSocket: cannot call unresolved function

I am running Qt 5.7.1 (MSVC 2015, 32 bit) with Qt Creator 4.2.0. I have a problem with QSslSocket ... the socket working or has any suggestions? 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++ - smart pointers not working with Android NDK r8

I can't figure out how to use shared pointers within my Android project. I'm using the latest Eclipse ADT on ... for some reason. Any 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++ - Why can't I do std::map.begin() + 1?

I have a std::map, which I want to iterate over, starting at the second entry. I can workaround this fine, ... 'int' What's happening 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++ - #include anywhere

Is the #include <file> meant to be used for headers only or is it simply a mechanical "inject this code ... will compilers scream about 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++ - linking error when building Google test on mac (commandline)

I am currently trying to build some test code that uses Google C++ Test framework but I keep getting an ... Any suggestions would be helpful. 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 will std::uncaught_exception change to std::uncaught_exceptions?

I just noticed over on http://en.cppreference.com/w/cpp/error/uncaught_exception that C++17 will replace std ... future version of 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++ - Equivalent to "SIGINT" (posix) signal for catching "CTRL+C" under Windows/MinGW

I am porting a Linux/gcc program under windows and implemented common exceptions handling for both. I was wondering what ... ) ? Thanks a lot. 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++ - circular dependencies between dlls with visual studio

I have a circular dependency between two functions. I would like each of these functions to reside in its own ... discussion I want to have. See Question&Answers more detail:os...

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

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741 views

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c++ - Why can't decltype work with overloaded functions?

decltype fails if the function you're calling it on is overloaded, as in this code: #include <iostream> int test( ... ? What am I missing 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++ - class has virtual functions and accessible non-virtual destructor

I have two classes: class A { public: virtual void somefunction() = 0; }; class B : public A { public: B ... warning. How can I fix the 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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