Recent questions tagged C++

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c++ - acos(double) gives different result on x64 and x32 Visual Studio

acos(double) gives different result on x64 and x32 Visual Studio. printf("%.30g ", double(acosl(0. ... me 1.0473040763868078 as result? 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++ - Changing type without changing bits

I want to take a stack variable and reinterpret cast it into an unsigned integer type of the same ... 0 64 9223372036854775808 32 2147483648 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++ - Invalide use of incomplete type Qt

I have a little problem : finddialog.h #ifndef FINDDIALOG_H #define FINDDIALOG_H class QDialog; class QWidget; class ... is it not working? 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++ - Program crashes when trying to set a character of a char array

I got this weird behavior of my programm, that i cant figure out. My professor showed me a flaw in my ... will go crazy wondering 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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c++ - What happens when constructor's parameter has same name as member variable?

I am trying a code which goes like this:- class Something { private: int data; public: Something(int data) { data ... as 0. kindly help. TIA. 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++ - bmiColors field of BITMAPINFO structure

The BITMAPINFO structure has the following declaration typedef struct tagBITMAPINFO { BITMAPINFOHEADER bmiHeader; RGBQUAD ... a pointer? 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++ - Create std::list of value instead of std::list of pointers in recursive function

I have this class: class obj { public: obj() : parent(nullptr), depth(0) { } obj* parent; list<obj> ... instead of in a list of pointers? 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++ - file writing not working after call to open file dialog

after call to following function i cant write to any files i tried c++ fstream and c's fopen what's wrong ... sizeof(ofn)); return fileName; } 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++ - Accessing a class member in an if statement using std::is_same

I'm trying to tackle the following problem: I would like to do an if statement that does something depending on ... able to do such a thing 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 spirit revert parsing

I want to parse a file containing the following structure: some garbage *&% section1 { section_content } ... one section_name_rule 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++ - Array Size Member Function Compile Error

Working with this code: int myArray[10]; for(int i = 0; i < myArray.size(); i++) cout << myArray[i] < ... something obvious but I don't see 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++ - How to print vector's data

I've searched a lot over the internet, and couldent find simple examples to print vector's data.. I ... there is no acceptable conversion)" 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++ - First member of class

I know the following is bad but i was under the impression that the first member of class is the ... constructors or virtual functions ? 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++ - 3D Screenspace Raycasting/Picking DirectX9

I need to convert a 2D mouse coordinate to a 3D world coordinate based on a specific depth (it's for raycasting). ... don't get 3D maths... 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 seekg() when taking input from redirected stdin

So i'm trying to read in a string of characters twice using cin.get(). The input is being redirected as ... incorrectly? Thanks for 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++ - {Makefile Error} "commands commence before first target. Stop."

I'm trying to produce a makefile for use with my Raspberry Pi, the intention is to use the Pi's camera ... a solution I would be grateful. 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++ - Comparing constexpr function parameter in constexpr-if condition causes error

I'm trying to compare a function parameter inside a constexpr-if statement. Here is a simple example: ... would be appreciated. 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++ - ifstream object.eof() not working

I think i might need to use a boolean bValue = false for my while condition: char cArray[ 100 ] = ""; ... { // parase contents of file } 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 resume playing after paused using gstreamer?

I've written C++ wrapper for each Gstreamer types. They're simple and intuitive, so I don't think their ... it to gstreamer video overlay. 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 shouldn't I put "using namespace std" in a header?

Someone once hinted that doing this in a header file is not advised: using namespace std; Why is it not advised ... in tools.lib(Exception.obj) 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++ - cudaMemcpy error when copying from device to host after __device__ class member function alters value of device variable

I am confused as to the behavior of the CUDA code I have written. I am in the midst of writing tests ... ": invalid argument gpugrid.cu 166 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++ - Reset property page settings Visual Studio C 2010 Express

I made some changes to the Property Pages/Configuration Properties a long time ago and I'd like to reset them. I ... to the default. 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++ - Confused about firstprivate and threadprivate in OpenMP context

Say I have packed some resources in an object, and then perform some computation based on the resources. What I ... to me they are very 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++ pointer assignment operator overload(not just object assignment but pointer assignment)

Is there a way to overload the pointer assignment operator? e.g. overload pointer assignment operator for class A when A *x, *y; x = y; 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++ class why need main?

Hello I'm writing a little project in c++ where I would like to have some classes that does some work, I wrote ... I need it? Where Am I 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++ - double byte character sequence conversion issue in Visual Studio 2015

I am trying to convert double byte character sequence (DBCS) in CP936 to wchar_t using C++ locale. This is ... a bug report with Microsoft. 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++ - pass attribute to child rule in boost spirit

I have two rules with the same attribute. Is it possible to pass the attribute of the matrix_ rule to the ... of the push_back semantic action? 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 compile Quake 2 source?

I've downloaded the full Quake2 source code but having a problem compiling the ref_soft project (ref_soft.dll) inside ... MSVC 2019 on Win 10. See Question&Answers more detail:os...

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

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