Recent questions tagged C++

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c++ - Why does Release/Debug have a different result for std::min?

Here is the test program: void testFunc() { double maxValue = DBL_MAX; double slope = std::numeric_limits< ... am using Visual Studio 2015. 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 the Visitor Pattern with template derived classes

I try to implement the Visitor pattern with templated derived classes I work with gcc 4.5 here is the VisitorTemplate ... so I can't template 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++ - Non-interleaved vertex buffers DirectX11

If my vertex positions are shared, but my normals and UVs are not (to preserve hard edges and the likes ... vertex buffers? 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++ - How to set up wxWidgets 3.1.0 with Visual Studio 2015

I am somewhat of a beginner when it comes to open source libraries. I have tried to compile from source and use ... me. Thanks for your 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 convert mouse coordinate on screen to 3D coordinate

I'm creating a 3D application using GLUT in C++. Now, I want to implement a method similar to this: ... How can I implement this method? 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++ - Android OBB/ZIP loading (cocos2dx)

I have a problem dealing with the APK expansions. On Java side, I could set up everything I supposed to set, but ... I'm using the right path) 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++ - V8 Multithreaded function

I'm writing a Node plugin and I'm having problems trying to call a V8 function object from a C++ worker thread ... = std::thread(threadFunc); } 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++ - Better random algorithm?

I'm making a game in C++ and it involves filling tiles with random booleans (either yes or no) whether it is ... on how I could improve rand()? 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++ - TCP Zero copy using boost

I am trying to implement tcp zero copy using boost but i am not able to find anything on google .My question ... me some example or some link. 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 with T::iterator, where template parameter T might be vector<int> or list<int>

I'm trying to write a function to print a representation of common STL containers (vector, list, etc..). I gave the ... } cout << "] "; } 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 asynchronously load data from large files in Qt?

I'm using Qt 5.2.1 to implement a program that reads in data from a file (could be a few bytes to ... , like there are for network transport? 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++ - std::memory_order_relaxed atomicity with respect to the same atomic variable

The cppreference documentation about memory orders says Typical use for relaxed memory ordering is incrementing counters, ... to other data. 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 compiler allows narrowing conversions

Can anyone please explain to me, why the compiler allows initialize variables of built-in type if the initializer might ... { } [-Wnarrowing]. See Question&Answers more detail:os...

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

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586 views

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c++ - Allow entry in QLineEdit only within range of QDoubleValidator

I have a set of QLineEdits that are supposed to accept double values within a certain range, (e.g., - ... the validate() function somewhere? See Question&Answers more detail:os...

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

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387 views

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c++ - timespec equivalent for windows

I am porting my application to windows from unix and I have run into a wall. In my application I need ... I have searched in windows supports. 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++ - Suspend pthreads without using condition

I want to suspend pthreads but apparently, there is no such function as pthread_suspend. I read somewhere about ... it without using conditions? See Question&Answers more detail:os...

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

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380 views

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c++ - How to get rgb value by cimg?

CImg<unsigned char> src("image.jpg"); int width = src.width(); int height = src.height(); unsigned char* ptr = ... ; How can I get rgb from ptr? 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++ - Redirect the copy of std::cout to the file

I need redirect the copy of std::cout to the file. I.e. I need see the output in console, and in file. If ... in console. 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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523 views

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c++ - How to call a non static member function from a static member function without passing class instance

I need to call a non static member function from a static member function of the same class. The static ... the non static member function? See Question&Answers more detail:os...

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

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657 views

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c++ - LD_PRELOAD only working for malloc, not free

I'm trying to interpose malloc/free/calloc/realloc etc with some interposers via LD_PRELOAD. In my small test, ... = 0x601010 HOST p=0x601010 See Question&Answers more detail:os...

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

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232 views

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c++ - How can I allocate all the availble memory in visual studio for my application?

I want to render 4 millions triangles in my windows based software which is written in Visual Studio C++ 2010 (Build ... 3 integers v1, v2, v3; See Question&Answers more detail:os...

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

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701 views

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c++ - Using std::shared_ptr<void> to point to anything

I'm using a std::shared_ptr<void> in my application to make a smart pointer which can point to many different types ... I'm not sure about 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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351 views

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c++ - Using libraries with emscripten

I have just started using Emscripten and would like to start using GLFW and other libraries. I am ... Emscripten? Or specifically GLFW? See Question&Answers more detail:os...

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

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356 views

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c++ - Which compilation flags should I use to avoid run time errors

Just learned here that -Wsequence-point comiplation flag will pop a warning when the code can invoke UB. I tried ... code more safe and robust? 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++ - Determining the least element and its position in each matrix column with CUDA Thrust

I have a fairly simple problem but I cannot figure out an elegant solution to it. I have a Thrust code ... for the reduce by key 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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387 views

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c++ - Is there an alternative to inet_ntop / InetNtop in Windows XP?

I'm trying to compile beej's guide to network programming examples, but Windows XP doesn't have such a function ... if it makes any difference. See Question&Answers more detail:os...

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

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455 views

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c++ - why does the array decay to a pointer in a template function

I don't understand why the array decays to a pointer in a template function. If you look at the following code: When ... ; f1(buff); 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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227 views

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c++ - What is the supposed behavior of copy-list-initialization in the case of an initializer with a conversion operator?

class AAA { public: AAA() {} AAA(const AAA&) {} }; class BBB { public: BBB() {} operator AAA() ... systematic explanation for all these mess... See Question&Answers more detail:os...

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

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