Recent questions tagged C++

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I have a euclidean vector a sitting at the coordinates (0, 1). I want to rotate a by 90 degrees (clockwise) ... how a vector is to be rotated? 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 a = (a+b) - (b=a) a bad choice for swapping two integers?

I stumbled into this code for swapping two integers without using a temporary variable or the use of bitwise ... to swap two integers? 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 std::stoi actually safe to use?

I had a lovely conversation with someone about the downfalls of std::stoi. To put it bluntly, it uses std:: ... that exception when given "abc"? 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 difference between QImage and QPixmap?

I do not understand what is the difference between QImage and QPixmap, they seem to offer the same functionality. ... should I use a QPixmap? 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++ - Fast implementation of Rolling hash

I need a Rolling hash to search for patterns in a file. (I am trying to use the Rabin-Karp string search ... in the right direction will 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++ - Linking Statically with glibc and libstdc++

I'm writing a cross-platform application which is not GNU GPL compatible. The major problem I'm currently ... this cause issues with rtld? 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 should I make function curry?

In C++14, what is a good way to curry functions or function objects? In particular, I have an overloaded function ... d) must be a valid call. 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 and Python 3.x

How does boost.python deal with Python 3? Is it Python 2 only? 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++ - Base64 encoding and decoding with OpenSSL

I've been trying to figure out the openssl documentation for base64 decoding and encoding. I found some code ... compiled with the libraries. 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 asynchronous javascript interpreted and executed in Node.js?

I've been doing a lot of research into the core of Node.js lately, and I have some questions about the ... is interacting with any of 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++ - What is the meaning of auto main()->int?

I happened to come across the below code snippet in a video on C++11, where the author uses auto main()->int ... int" but didn't find 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++ - "Isolate" specific Row/Column/Diagonal from a 64-bit number

OK, let's consider a 64-bit number, with its bits forming a 8x8 table. E.g. 0 1 1 0 ... https://www.chessprogramming.org/Kindergarten_Bitboards 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 restrict a template class to certain built-in types?

This issue has been discussed a few times but all the solutions I have found either didn't work or were based ... Any ideas? 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++ - Examples or tutorials of using libjpeg-turbo's TurboJPEG

The instructions for libjpeg-turbo here describes the TurboJPEG API thus: "This API wraps libjpeg-turbo and provides an ... , so that does 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++ - How to programmatically unplug & replug an arbitrary USB device?

I'm trying to fix a non-responsive USB device that's masquerading as a virtual COM port. Manual replugging ... of the unplug/replug cycle? See Question&Answers more detail:os...

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

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248 views

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c++ - C++11 is_same type trait for templates

Is it possible to check that type T is an std::array of arbitrary type and size? I can check for a ... this (maybe not using is_same)? See Question&Answers more detail:os...

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

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204 views

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c++ - How to use vector::push_back()` with a struct?

How can I push_back a struct into a vector? struct point { int x; int y; }; std::vector<point> a; a.push_back( ??? ); 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 pass preprocessor macros

How can I pass a macro to the preprocessor? For example, if I want to compile some part of my code because a ... , so how can I accomplish 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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432 views

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c++ - Unknown compiler version while compiling Boost with MSVC 14.0 (VS 2015)

I get "Unknown compiler version - please run configure tests and report the results" while attempting to compile ... the configure tests"? . See Question&Answers more detail:os...

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

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234 views

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c++ - How to find whether an element exists in std::map?

My use case: map<string, Car> cars; bool exists(const string& name) { // somehow I should find whether my MAP has a ... to do it in C++? 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 get a pointer from a reference?

There seems to be many relavent questions talking about pointer vs. reference, but I couldn't find what I ... most illustrative in this 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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282 views

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c++ - At what point in the loop does integer overflow become undefined behavior?

This is an example to illustrate my question which involves some much more complicated code that I can't post here ... if they are different.) 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 continue in a switch statement

I want to jump from the middle of a switch statement, to the loop statement in the following code: while ( ... + differ on their behaviour 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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336 views

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c++ - Calculating Binomial Coefficient (nCk) for large n & k

I just saw this question and have no idea how to solve it. can you please provide me with algorithms , C++ codes or ... 2 10 3 Output: 3 10 120 See Question&Answers more detail:os...

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

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c++ - Cycle through pixels with opencv

How would I be able to cycle through an image using opencv as if it were a 2d array to get the rgb ... over an iplimage for this operation? See Question&Answers more detail:os...

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

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360 views

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c++ - How do I initialize a stl vector of objects who themselves have non-trivial constructors?

suppose I have the following class: class MyInteger { private: int n_; public: MyInteger(int n) : n_(n) {}; // ... and can't find in the web. 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 far to go with a strongly typed language?

Let's say I am writing an API, and one of my functions take a parameter that represents a channel, and ... know your comments and alternatives. 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++ - Confusion about threads launched by std::async with std::launch::async parameter

I am a little bit confused by the std::async function. The specification says: asynchronous operation being executed ... that supposed to 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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