Recent questions tagged C++

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c++ - template class, friend operator << overload

I'm trying to overload the "<<" operator for a template class. I've the definition of the class in a .h file and ... ) clean: rm -rf $(BIN)/* 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++ - mex with MATLAB2013a Unrecognized switch: -o

I am trying to run a code which compiles some c++ codes using mex. I have set up mex with Microsoft ... very limited knowledge of using mex. 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 overload a function for a concept?

Suppose I have a function template and various overloads that "specialize" the template. As overloads are a better ... for a whole concept? 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 pass a vector to execvp

I want to pass a vector in as the second argument to execvp. Is it 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++ - making auto timeout with std::cin statement

I wrote the program #include<iostream> using namespace std; int n; int main(int argc, char *argv[]) { std ... Any information is most welcome... 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++ - undefined reference to WinMain, [Error] Id returned 1 exit status

What have I screwed up here? There can be no hard coded values in the code which is why all my prompts ... dollarSaved; } return dollarSaved; } 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 loading shared libraries of boost

I am working on centos. I installed boost version 1.45.0 on my system. The programs are compiled correctly but ... : No such file or directory 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++ - Reading an ordered sequence of images in a folder using OpenCV

I have this following example code, where I'm displaying my webcam. But how can I display a sequence of pictures in a ... (1); } 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++ - Undefined reference error with new filesystem library and clang++7

I was trying to out the new filesystem STL library, but for some reason am getting errors. The Clang++7 ... 17 in the compilation string above. 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++ - Set Precision and Clip Trailing Zeros but Never Print Exponent

I need to: Set precision so that floats are rounded to the hundredths place ( 0.111 prints as 0.11 ) Clip ... will let me handle all of these? 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 this variadic function ambiguous?

This is related to my earlier post. I'd like to know why one attempted solution didn't work. template < ... functions? What can they do? See Question&Answers more detail:os...

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

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183 views

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c++ - How to read in a video file as grayscale

When you read in an image, there is a flag you can set to 0 to force it as grayscale. cv::Mat ... grayscale Is there an equivalent for videos? 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++ Reading string from binary file using fstream

I am trying to read a string from a binary file but cant seem to get it to work. I am a pretty new to c++. ... system("Pause>NUL"); 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++ - Storing vector in memory mapped file

I am attempting to store a vector of arbitrary elements in a memory mapped file (for now I'm trying to ... help will be greatly appreciated.` See Question&Answers more detail:os...

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

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438 views

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c++ - std::unordered_map with boost::interprocess allocator in shared memory - drawbacks?

I'm right now getting into shared memory using boost::interprocess. I've defined a few std:: ... stacked-crooked.com/a/91d1a143778cf3e9 See Question&Answers more detail:os...

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

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456 views

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c++ - While loop with try catch fails at bad cin input

I can't seem to figure out why this falls into a loop after getting non-int input. I've tried cin.flush(), ... system("pause"); 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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391 views

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c++ - How to convert a char array to a byte array?

I'm working on my project and now I'm stuck with a problem that is, how can I convert a char array to a ... byte[4] is 0xff,0xf2,0xbd,0xf1. See Question&Answers more detail:os...

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

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311 views

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c++ - set flag in signal handler

In C++11, what is the safest (and perferrably most efficient) way to execute unsafe code on a signal ... Basile Starynkevitch's solution 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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294 views

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c++ - How to convert a binary string into base64 encoded data

I am receiving binary data in a string. I want to encode that into Base64. Is there any class to do that operation (I want an API). 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++ - How can I prevent URLDownloadToFile from retrieving from the cache?

I am using URLDownloadToFile to retrieve a file from a website. Subsequent calls return the original file ... retrieving a cached version. See Question&Answers more detail:os...

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

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250 views

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c++ - Boost weak_ptr's in a multi-threaded program to implement a resource pool

I'm thinking of using boost::weak_ptr to implement a pool of objects such that they will get reaped when nobody ... what to do? Thanks. Andrew 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++ - Passing a qualified non-static member function as a function pointer

I have a function in an external library that I cannot change with the following signature: void ... to solve 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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282 views

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c++ - Is taking uninitialized references of class members during construction legal?

Coming from this question, I am going a step further: C* c = static_cast<C*>(malloc(sizeof(C))); As ... I used pointers instead of references? 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++ - Parallelizing a Breadth-First Search

I just taught myself some OpenMP and this could be stupid. Basically I'm trying to parallelize a breadth first ... can I get around 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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277 views

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c++ - Is there symbol conflict when loading two shared libraries with a same symbol

An application (app) depends on two shared librarys: liba.so and libb.so. liba and libb have the same function ... to load libraries 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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431 views

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c++ - The procedure entry point could not be located in the dynamic link library - looking in wrong DLL

When building for a specific configuration, my program seems to be looking for specific functions in the wrong ... link library libvlc.dll See Question&Answers more detail:os...

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

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484 views

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c++ - Iterate through struct variables

I want to get an iterator to struct variable to set a particular one on runtime according to enum ID. for ... /else or switch case statements? See Question&Answers more detail:os...

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

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279 views

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c++ - Embed image in code, without using resource section or external images

I'm looking for a way to embed an image in a library (Windows-only). I don't want to go the 'traditional' ... that doesn't use MFC too. 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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