Recent questions tagged C++

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I'm creating game mario like in win32 GDI . I've implemented the new loop for game : PeekMessage(&msg,NULL,0,0 ... ( mouse cursor is rolling ). 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::interprocess simple application

I want to write a simple application with boost that passes string object to other process. It compiles well, but ... work in proper way ? 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++ - Win32. Enable visual styles in dll

I've got no experience in C++ and Win API so sorry if this question is nooby. I've got DLL where I ... but has signature with some HANDLE type. 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 change of system time in Linux?

Is there a way to get notified when there is update to the system time from a time-server or due to ... hour granularity, without using SQL. 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++ - Global variable has multiple copies on Windows and a single on Linux when compiled in both exec and shared libaray

* Question revised (see below) * I have a cpp file that defines a static global variable e.g. static ... wrong variable as being 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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c++ - Including directories in Clion

Whenever I wanted to include a directory that was located outside of my project with Clion I would use the -I ... get the behavior 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++ - find_if and std::pair, but just one element

Suppose i have the following code: std::vector< std::pair <int, char> > myVec; or std::list< std::pair <int, char> ... ^^^^^^^ how can i do 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 to generate all variations with repetitions of a string?

I want to generate all variations with repetitions of a string in C++ and I'd highly prefer a non-recursive ... wish my homework was like 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++ - How can I detect if there is input waiting on stdin on windows?

I want to detect whether or not there is input waiting on stdin in Windows. I use the following generic ... not support selecting on STDIN. 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++ - Using ODBC to connect to SQL SERVER 2008

I'm on a W32 machine trying to get a connection with a DB. For that purpose, I tried starting testing an example ... is that I'm 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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c++ - OpenCL Floating point precision

I found a problem with host - client float standard in OpenCL. The problem was that the floating points ... in advance for all answers. 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++ - Suppress warnings for external headers in VS2017 Code Analysis

I want to use the Code Analysis in Visual Studio 2017 but I'm using Qt and it gives me a lot of ... Analysis for the Qt external headers? 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++ - Print information in "test mode" but not in "normal execution"

I am using an application in c++ that uses a special dprintf function to print information, this is an example: ... or implement the same idea?. 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++ - Convert template function to generic lambda

I'd like to pass templated functions around as if they were generic lambdas, however this does not work. #include ... even open to macro hacks. 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 use lambda for container comparison operator ?

This is how I would use inbuilt function or new class as a custom comparator priority_queue< int, vector<int>, ... use lambda functions 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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416 views

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c++ - Split 3D MatND into vector of 2D Mat opencv

Is it possible to get a 2D Mat object from a 3D data cube stored as MatND in opencv? Basically I'm passing a ... 109 114 119 105 110 115 120 See Question&Answers more detail:os...

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

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277 views

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c++ - Calculating the distance between 2 latitudes and longitudes that are saved in a text file?

I've looked around and still couldn't find anything to help me really! I've written a program to calculate the ... << " kilometers" << endl; 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 is there no wait function for condition_variable which does not relock the mutex

Consider the following example. std::mutex mtx; std::condition_variable cv; void f() { { std::unique_lock ... realizing the desired behavior? 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++ - I get a segmentation fault instead of an exception

In the following code, at the first iteration I get an exception, and at the second one I get a segmentation fault ... - GCC 4.5.1 Intel Xeon 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++ - Task Dependency in OpenMP 4

The following code works based on the OpenMP 4.0 specification: The out and inout dependence-types. The generated task will ... } } 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++ - Static libraries, dynamic libraries, DLLs, entry points, headers ... how to get out of this alive?

I recently had to program C++ under Windows for an University project, and I'm pretty confused about static ... Compiling and Linking (Windows) See Question&Answers more detail:os...

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

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210 views

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c++ - Sparse array compression using SIMD (AVX2)

I have a sparse array a (mostly zeroes): unsigned char a[1000000]; and I would like to create an ... in SIMD register, arranged contiguously? 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++ - Use RegisterDeviceNotification() for ALL USB devices

I currently have some code that sets up notifications of connected USB HID devices within a Windows Service (written in ... a GUID for all USB? See Question&Answers more detail:os...

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

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367 views

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c++ - Is extern keyword really necessary?

... #include "test1.h" int main(..) { count << aaa <<endl; } aaa is defined in test1.h,and I didn ... . So I doubt is extern really necessary? 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: how to determine all the .DLL/.SO files that are need for an executable?

Let's assume my program needs several DLL's to work. I should provide that DLLs to the user in my distribution. ... for the DLLs. 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++ - Is inline asm part of the ANSI C standard?

I always thought it was but many IDEs and syntax highlighting tools do not highlight ASM in C, but they always do ... (ANSII or ISO) 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++ - Busy Application leads to false "Not responding" state on Windows 7 - WM_UPDATE

During long term operations our C++ Win32 application shows a modal status dialog with a process bar, ... found any documentation thereabout. See Question&Answers more detail:os...

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

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450 views

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c++ - Erasing item in a for(-each) auto loop

Is there a way to erase specific elements when using a auto variable in a for loop like this? for(auto a: ... code I'd be happier. 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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