Recent questions tagged C++

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c++ - Resolving circular dependencies by linking the same library twice?

We have a code base broken up into static libraries. Unfortunately, the libraries have circular dependencies; e.g. ... to trigger them. 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++ - Why has the std::vector::resize signature been changed in C++11?

What are the reasons behind the change in std::vector::resize from the pre-C++11: void resize( size_type ... count, const value_type& value); 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 an enum class in a boolean context?

I have some generic code that works with flags specified using C++11 enum class types. At one step, I'd ... class enum in a boolean context? 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++ - padding with sprintf

I have a dummy question. I would like to print an integer into a buffer padding with 0 but I cannot sort it out ... for a max width of 30 chars? 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 return type of sizeof operator?

What is the return type of sizeof operator? cppreference.com & msdn says sizeof returns size_t. Does it really ... don't get any warnings. See Question&Answers more detail:os...

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

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320 views

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c++ - Does `sizeof` *really* evaluate to a `std::size_t`? Can it?

Take the following standard passage: [C++11: 5.3.3/6]: The result of sizeof and sizeof... is a ... again, nowhere is this actually required. 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 std:set (with a single colon) compile?

I accidentally wrote std::set<string> keys; as: std:set<string> keys; but weirdly enough, Visual Studio 2013 ... ); toret.push_back(tempv); } 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 find muliplication of large numbers modulo 100000007

As we know 1000000007 is a large prime number. How can I find multiplication of two large numbers modulo ... long long 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++ - Get drive type with SetupDiGetDeviceRegistryProperty

I would like to know whether i can get the drive information using the SP_DEVICE_INTERFACE_DETAIL_DATA's DevicePath my ... Please help me up 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++ - Truncate or resize a file in order to modify its end

I have a FILE* file that holds some binary data. Let's say that this data are a list of double and that ... write my new string using fwrite ? See Question&Answers more detail:os...

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

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216 views

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c++ - Best way to convert 8 boolean to one byte?

I want to save 8 boolean to one byte and then save it to a file(this work must be done for a very large data ... me a better code(more speed) ? 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++ - Writing char* to binary file using ostream::write

I am trying to write a char* to a binary file. This is what I have now. void Write(char* fileName, char* ... Can some one explain it to 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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186 views

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c++ - Windows, opening a raw disk

I'm trying to read bytes from a raw disk. (Windows 7, VS 2010.) I get a value of -1 for hDisk (which I assume ... ; std::cin.get(); 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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872 views

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c++ - random over a range, is number bias present for new rand() version?

reading from various other SO questions, when using rand() % N you may happen to modify the bias for the pseudo ... a bias like rand()? 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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280 views

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c++ - Client program to validate server certificate returned by SSL_get_peer_certificate?

I have a SSL/TLS client program using OpenSSL in C++ programming language. I am looking for methods to validate ... return -1; return fd; } See Question&Answers more detail:os...

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

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172 views

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c++ - Qt, Sending multiple data types from client to server + data Streaming

I have a Client/Server based Qt application, using QTcpServer and QTcpSocket, I managed to do the connection and ... in the right direction. 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++ - CUDA - median filter implementation does not produce desired results

I have been trying to implement the algorithm for the median filter presented in the Wiki article: http://en. ... press cv::waitKey(); } See Question&Answers more detail:os...

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

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318 views

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c++ - ambiguous call in template error

Can anyone tell me the cause of error ? Error is C:webemplate1.cpp||In function 'int main()':| C:webemplate1.cpp|23| ... "<<b<<endl; 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++ - OpenCv + mac os x + qt creator = strange linking bug?

I'm trying to build simple OpenCV app using qt creator on Mac Os X 10.9. So i've installed OpenCv and Qt4 ... working and i will be happy :) See Question&Answers more detail:os...

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

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535 views

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c++ - Qt: How to play sound witout blocking main thread?

I'm wondering is there a simple way in Qt to play sound without blocking the main thread ? I know that normaly ... ? :) Thanks for 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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229 views

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c++ - Virtual multiple inheritance - final overrider

while trying to analyse in greater depth inheritance mechanism of C++ I stumbled upon the following example: ... the low-level perspective? See Question&Answers more detail:os...

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

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382 views

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c++ - How to convert Euler Angles to Front, Up, Right vectors

I need a function that given Yaw, Pitch, and Roll, can produce the Front (or Looking At), Right, and Up ... get a quaternion from euler angles. See Question&Answers more detail:os...

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

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289 views

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c++ - detect quite brighter spots on the image

I have a bit noisy image where the background is not homogeneous. The image contains brigther convex spots, and I ... I can't distinguish later. See Question&Answers more detail:os...

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

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852 views

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c++ - Simulate mouse click without moving the cursor

I wrote an application that detects all active Windows and puts them into a list. Is there a way to simulate a ... to the handle of the window See Question&Answers more detail:os...

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

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211 views

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c++ - typedef'd type not visible as return type of a member function

This program fails to compile(using gcc-4.5). The error message says: error: myType_t' does not name a type ... is typedef'd inside the 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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425 views

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c++ - How to stop an std::thread from running, without terminating the program

I am trying to learn std::threads from C++11 to make a threading system. I was wondering if there is a ... without having to block a 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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331 views

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c++ - Eclipse on Mac dyld: Library not loaded: Image not found

All: I have successfully set up two projects (Hello and World) in one workspace (HelloWorld). These are simple ... > std::string getWorld(); See Question&Answers more detail:os...

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

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159 views

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c++ - How does a treap help to update this ordered queue?

I'm having trouble understanding this solution to a problem on HackerRank. Please see the solution code below, apparently ... endl; 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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