Recent questions tagged C++

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c++ - Converting integer to a bit representation

How can I convert a integer to its bit representation. I want to take an integer and return a vector that ... library function that could 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 retrieve the first decimal digit of number efficiently

One obvious solution is: int n = 2134; while(n > 9) n /= 10; which takes linear time. Could we do any ... Also, I don't understand the answer). 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 out DC's dimensions?

Let's say I have a handle to device context (naturally, in Windows environment): HDC hdc; How can I get the width and height of 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++ - Visual Studio 2010 MSVCR dependency removal?

I've tried Googleing this but I could not find a solution. I am trying to learn some basic C++. I wrote a ... will run in XP and up? 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++ - Can I build a shared library by linking static libraries?

I have a bunch of static libraries (*.a), and I want to build a shared library (*.so) to link against those static ... can I do so in gcc/g++? 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 deduce the type of the functor's return value?

I would like to write a template function which accepts 2 values and a functor or a lambda. The function calls ... Is there a more elegant 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++ - Increasing TCP Window Size

I have some doubts over increasing TCP Window Size in application. In my C++ software application, we are sending ... above, please let me know. 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++ - SDL_PollEvent() stuttering while idle?

I've cobbled together a very basic game loop in C++ using SDL2, and I've noticed that every few seconds ... devices and (b) SDL_RenderPresent()? 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++ - Needless pointer-casts in C

I got a comment to my answer on this thread: Malloc inside a function call appears to be getting freed on ... sides. Thanks for posting, folks. 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++ - Negative ASCII value

What's the point of negative ASCII values? int a = '?'; //a = -85 but as in ASCII table '<<' should be 174 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++ - size of dynamically allocated array

Is it true that a pointer assigned to the starting address of a dynamically allocated array does not have the ... in another variable? 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++ - glGenBuffers not defined?

I'm using windows and I notice that a lot of functions are grayed out because I guess #ifdef GL_GLEXT_PROTOTYPES ... Windows by default.) 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++ - Writing my own shell... stuck on pipes?

For the past few days I have been attempting to write my own shell implementation but I seem to have gotten stuck ... ->push_back(pid); } } 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++ - Unions, aliasing and type-punning in practice: what works and what does not?

I have a problem understanding what can and cannot be done using unions with GCC. I read the questions (in ... does the compiler flag 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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c++ - Handling Julian dates in C++11/14

What is the best/easiest way to deal with Julian dates in C++? I want to be able to convert between ... chrono> library help with this 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++ - Injecting string to 'cin'

I have a function that reads user input from std::cin, and I want to write a unittest that inserts some ... inject my "fake keyboard input"? See Question&Answers more detail:os...

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

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176 views

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c++ - Why can't I read fstream's binary data with operator>>?

If I do something like the following: ifstream file; file.open("somefile", ios::binary); unsigned int data; ... Can someone explain this issue? 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++ - Size of a bitfield member?

Would anyone know how to extract the size of a bit-field member. The below code naturally gives me the size of an ... < sizeof(test) << 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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389 views

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c++ - How to prevent SIGPIPE or prevent the server from ending?

A quite standard C++ TCP server program using pthreads, bind, listen and accept. I have the scenario that the server ends ( ... #5 ... in ?? () 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++ - printing float, preserving precision

I am writing a program that prints floating point literals to be used inside another program. How many digits do I ... ++ does not support them. 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++ - A function with variable number of arguments with known types, the c++11 way

I already know the stdarg.h way to have a function with variable arguments in c++ as discussed here for example. I ... yes, how can I do 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++ - How can I disable the debug assertion dialog on Windows?

I have a bunch of unit tests that I'm running in batch mode. Occasionally, one will crash with a debug ... disable assertions; just the dialog. 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 size of derived class object using base class pointer

Is it possible to find the size of a derived class object using a base class pointer, when you don't know the derived type. 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 delete object constructed via placement new operator?

char * buf = new char[sizeof(T)]; new (buf) T; T * t = (T *)buf; //code... //here I ... new instead of non-placement? or something similar) 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++ - link static lib in eclipse cdt

I am sorry! I have googled this a lot and cannot find an answer! It's dumb I know. I cannot link in ... linking the libraries at run time... 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++ - Does this self-assignment do something sensible?

I just found this line of code within a function, which puzzles me. Can this make sense in any context ... am using an uninitialized variable. See Question&Answers more detail:os...

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

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370 views

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c++ boost::filesystem undefined reference to `boost::filesystem3::path::root_name() const'

I keep running across errors when trying to compile code which utilizes the boost::filesystem library. I don't ... What am I 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++ - May compiler optimizations be inhibited by multi-threading?

It happened to me a few times to parallelize portion of programs with OpenMP just to notice that in the end, ... time the question was posed. See Question&Answers more detail:os...

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

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