Recent questions tagged C++

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c++ - How to use QTcpSocket instance multiple times with couple second intervals?

I have to repeat the same request with QTcpSocket multiple times with a couple seconds intervals. Easy task but I can' ... () for second 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++ - sclite (SCTK) install, file not recognized, file format not recognized, Cygwin

I am currently trying to install NIST's sclite, which is part of SCTK 2.4.0 (github or current version). I ... in the answer to 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++ - Dereferencing a class pointer function in iterator

I have created a Vector of pointers to a class called Food vector<Food*> items; The class looks like the following: ... () << endl; 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++ - GetComputerName() not displaying Unicode correctly in Windows console

I'm relatively new to WinAPI programming in C++. I'm trying to write a program that will obtain the ... I overlooking something stupid? 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++ - Repeated random number in a loop

A need to generatera random numbers between 0 and 1 for every different loop. for ( 1 to 10000) a call ... How can i 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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c++ - error when trying to overload << operator and using friend function

I am trying to overload << operator and using friend function. Below code chunk works just fine. template <class ... Just a sample. Kindly bear. 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++ - uninitialized local variable 'j' used

Here is a section of some code I have. Im getting an error uninitialized local variable 'j' used and I dont see it ... ++; } } return MoleSum; } 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 does OpenMP use the atomic instruction inside reduction clause?

How does OpenMP uses atomic instructions inside reduction constructor? Doesn't it rely on atomic instructions at all? For ... += v[i]; } 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++ - Running OpenCV 3 in Mac Terminal

For the past week, I have been trying to run some simple OpenCV programs using the terminal. I have tried ... would be appreciated. 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++ - Link error using templates

I converted a function to a template, and started getting this error. I must not be understanding a limitation of ... right) { return true; } 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++ - Deserializing constructor doesn't read data correctly

I am trying to deserialize an object that does not have a default constructor. I've seen that you can do this by ... Output "0 0" 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++ - Program of power operator in C

I'm creating a library which will have concepts similar kind of python. C doesn't have any power operator ... approach or solution for 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++ - Using malloc/realloc for array of classes/structs including std vector

I have a question wrt malloc/realloc memory that will contain an array of class/struct (i tried both struct and class the ... y[0]); return 1; } 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 initialize vector from array without allocating more storage space?

The direct way to initialize a vector from an array seems to be: int sizeArr; int * array = getArray(sizeArr ... any space for it separately? 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++ - OpenGL es 2.0 Gaussian blur on triangle

I recently learn opengl es 2.0, and now I try to make a gaussian blur on triangles generate by myself. I have some ... vec2(1.0, 0.0)); } See Question&Answers more detail:os...

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

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241 views

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c++ - Transparent window containing opaque text and buttons

I'm creating a non-intrusive popup window to notify the user when processing a time-consuming operation. At the moment ... a way of doing 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++ - Multiple definition error on variable that is declared and defined in header file and used only in its cpp file

I'm in the process of moving code written to be compiled for one chip onto another chip. One issue that's come ... the Arduino IDE by the 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++ - What is a busy loop?

Can it be a loop with or without statements? while (1) { //Empty } OR int i = 0; while (1) { i++; } 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 this there a defined behavior for this code that deletes a derived class through a base class pointer?

Does this code result in defined behavior? class A { int x; }; class B { short y; }; class C ... might define the behavior to be? 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 the child process affect parent process' environment?

What does "the child inherits the parent's environment" mean? Inherits by copying the whole environment, or ... are inherited. Stupid mistake. See Question&Answers more detail:os...

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

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301 views

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c++ - Active Contour Models in OpenCV 3.0

I'm trying to implement an Active Contour Models algorithm with Opencv 3.0 in C++. This algorithm is based ... knows what might be 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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300 views

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c++ - cout is declared in iostream, but where it is defined?

When I try to see definition of cout, I land to iostream file where it is declared as, extern _CRTDATA2 ... just declaration and not definition. 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++ - Invalid conversion from Foo** to void** - why is implicit type conversion allowed to void* but not to void**?

struct Foo {}; ... void * p = (Foo*)0; // OK void ** pp = (Foo**)0; // Invalid conversion As ... casting a ponter to pointer type to void**? 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 add qi::symbols in grammar<Iterator,double()>?

I am trying to use Boost.Spirit (V. 2.5) library to create a mini-calculator. Features I want to implement : - basic ... j = max(2*(i+1),5) 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++ - OpenGL: INVALID_OPERATION following glEnableVertexAttribArray

I'm porting a functioning OpenGL app from Windows to OSX, and keep getting an "invalid operation" (code 1282) ... state for each gl* 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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145 views

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c++ - Are IEEE float and double guaranteed to be the same size on any OS?

I'm working on a OS portable database system. I want our database files to be OS portable so that customers can ... same byte size on any OS? 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++ - Execute Instructions From The Heap

Can I allocate a block on the heap, set its bytes to values that correspond to a function call and its ... operators to execute that sequence? See Question&Answers more detail:os...

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

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402 views

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c++ - Simplest way to read a CSV file mapped to memory?

When I read from files in C++(11) I map them in to memory using: boost::interprocess::file_mapping* fm ... bottleneck with disk/IO streaming). See Question&Answers more detail:os...

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

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