Recent questions tagged c++

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c++ - Is it possible to use the hardware de-multiplexing for highload network servers?

For example, for an asynchronous IO by using TCP/IP (using POSIX poll/select or more advanced epoll, kqueue, ... adapter manualy, are there? 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++ - Virtual function efficiency and the 'final' keyword

Consider a program that has a class Foo containing a function Foo::fn declared like this: virtual void fn(); and ... exactly that of Foo::fn? 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 taxing are OpenGL glDrawElements() calls compared to basic logic code?

I'm planning to do some optimization on my OpenGL program (it doesn't need optimizing, but I'm doing ... drawing the blocks individually would. 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 g++ does not enable RVO here?

Consider that TEST code: #include <iostream> using namespace std; class Klass { public: Klass() { cout << "Klass()" ... . Why isn't it the case? 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 detect if autohidden taskbar is visible or not?

At the moment I need to detect in C++/Qt if a taskbar, which is set to "autohide" is visible on the screen ... ( I would appreciate any help :-) 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++ - Nested class member access on C++11

In C++11, I am trying to access a member variable of an enclosing class from a nested class in the following ... before the C++11 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++ - Initialization of Static Class members

If i try to initialize obj_s it asks me to make it const - and i cant do that for i have to keep count ... ] undefined reference to `A::obj_s' 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++ - In Boost ASIO how can I set the source IP address to impersonate another server's IP address?

I have a Boost ASIO-based C++ server program and I'd like to be able to set the source IP address used ... effectively shut it off for a while. 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++ - Simulating input using the SendInput function

The following program didn't do anything, athough had been expected to simulate pressing "a" and "b" for each ... don't know what caused 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++ - Can I expand a parameters pack and define an arguments list with it?

From [temp.variadic] (working draft) it seemed to me that a parameters pack can be expanded while defining an ... be as confused as 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++ - stl priority queue based on lower value first

I have a problem with stl priority queue.I want to have the priority queue in the increasing order,which is ... Plz someone ans.Advanced thanx. 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++ - string to float conversion?

I'm wondering what sort of algorithm could be used to take something like "4.72" into a float data type, equal to float x = 4.72; 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 create IMFSample from D11 texture for Intel MFT encoder

I want to encode video using the "Intel? Quick Sync Video H.264 Encoder MFT". If I create IMFSample from ... . Am I doing something 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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c++ - no match for operator*

I'm reading Effective C++ (Scott Meyers), and getting the error " no match for operator* " when trying to ... explain why this is happening ? 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++ - Excluding certain windows from screen capture

I'm trying to capture the entire desktop with BitBlt and I also want to exclude certain windows (of my own ... option as it produces a flicker. 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++ - Error subtracting floating point numbers when passing through 0.0

The following program: #include <stdio.h> int main() { double val = 1.0; int i; for (i = 0; ... (thanks to @therefromhere for that information). 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++ - Store different data types in map - with info on type

I need to parse and store a somewhat (but not too) complex stream and need to store the parsed result somehow. ... and I need to minimise 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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c++ - MFC: accessing GUI from another thread?

So generally only the main thread should access the GUI in a MFC application. However is that a law or just ... the GUI from another thread. 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++ - Attaching Member function of a class in pthread

pthread_t thread1; pthread_create(&thread1,NULL,.......,NULL); // Here I want to attach a thread to a member ... a class in the above 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++ - Creating an 2-dimensional array of a struct results in crash

I am trying to generate a two-dimensional array of a struct, but this results in the program not launching. ... these two methods? Thanks again! 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++ - Redirecting stdout in win32 does not redirect stdout

I'm trying to redirect stdout so that printf in a windows application will go to a file of my choice. I'm ... to be redirected but not printf. 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++ - Remove duplicates from an unsorted array

I'm trying to create a function to remove duplicates from an unsorted int array. I have a solution that works ... is the problem? 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++ - c - what does this 2 const mean?

code: const char * const key; There are 2 const in above pointer, I saw things like this the first time. ... will get compile error with tips. 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++ - Instantiate function for all combinations of template params, choose instantation at run time

Sorry if this has been asked before, but I couldn't find this exact question. I have a templated CUDA ... to limitations of our compiler. 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++ - QVariant's Visitor pattern (without manual type testing and casting)

Does Qt's QVariant class has any existing (and convenient) Visitor pattern implementation? If not, is it possible to ... (if at all possible). 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++ - LNK2001 error when compiling apps referencing STLport-5.1.4 with VC++ 2008

I apologize in advance for the long post... I used to be able to build our VC++ solutions (we're ... the library projects themselves. Any ideas? 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++ - The difference between 0 and '0' in array

I have a question about array initialization What is the difference between char a[6]={0}; and char a[6]={'0' ... they just the same 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++ - CMake 3.8.0 generates wrong link command in makefiles

Problem: After I run cmake to generate a project with a STATIC library, which completes successfully, both ninja ... lib_hello_world.lib ***** See Question&Answers more detail:os...

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

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