Recent questions tagged C++

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c++ - Why is copy constructor not being called in this code

So why is Copy constructor not being invoked in "const Integer operator+(const Integer &rv)" function. Is it because ... ) ~Integer() ~Integer() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What operators do I have to overload to see all operations when passing an object to a function?

I would like to write a piece of code that shows all copy/assignment/delete etc. operations that are done on ... ways of passing an object? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How Do I Make My Program in Qt Continually Send A String to My Arduino?

I am having trouble trying to get my program to continually send the string "move 200" while I hold down ... everything sent and the robot moves See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why simple console app runs but dialog based does not run in WIN CE 6.0?

I am developing an application for Windows CE 6.0 in embedded Visual C++ 4. I created a simple console ... this problem? Thanks in advance, See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Knight's tour backtrack implementation choosing the step array

So I came up with this implementation for solving knights tour for a 8*8 chess board. But seems like it is taking a long ... ,0,64); puts(""); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to write and read to/from a QResource file in Qt 5?

It's strange, I add desired file into the resources via Add Existing Files..., the file is there. I run ... 's output terminal of the code: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Failing to start Windows service after a MajorUpgrade with WiX

I have a pretty straight forward WiX project. Nothing fancy. When trying to perform a MajorUpgrade over an existing ... raw" /> </Property> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Outputting more things than a Polymorphic Text Archive

I'm using the Shark machine learning library, and it outputs its classifiers to file by using the boost:: ... a file alongside these archives? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Use templates to get an array's size and end address

You can use templates to find the length of an array. template<typename T, size_t N> size_t arraylen( T(& ... grabbing its size with templates? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How can I iterate through every possible combination of n playing cards

How can I loop through all combinations of n playing cards in a standard deck of 52 cards? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - boost asio write/read vector

I have trouble reading a vector from boost asio buffer. I have this vector: std::vector<float> points; And I ... what I am doing wrong? Marek See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to correctly draw simple non-client area (4 px red border)?

I'm trying to draw a custom painted non-client area, instead of default theme border (Windows 10). I handled ... uMsg, wParam, lParam); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to expand environment variables in .ini files using Boost

I have a INI file like [Section1] Value1 = /home/%USER%/Desktop Value2 = /home/%USER%/%SOME_ENV%/Test and want ... kind of file using boost. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why does an lvalue cast work?

I saw this kind of cast for the first time today, and I'm curious as to why this works. I thought casting in ... .f; } const float m_value; }; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How can I change the precision of printing with the stl?

I want to print numbers to a file using the stl with the number of decimal places, rather than overall precision. ... the stl << and ofstream. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Code submission on SPOJ gives runtime error (SIGABRT)

I have done an exercise on SPOJ to practice advanced algorithms. The Problem Statement is as follows: Harish went to ... . What might be wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ change function's variable argument

i want to change my variable passed as argument to this function: bool verifyStudent(string id, string name, int ... , iGrade, iPoints, iType); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why to use higher base for implementing BigInt?

I'm trying to implement BigInt and have read some threads and articles regarding it, most of them suggested to ... Some examples would be great. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Lambdas and std::function

I'm trying to catch up on C++11 and all the great new features. I'm a bit stuck on lambdas. Here's the code I ... ? I'm using GCC/G++ 4.6. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - The fastest way to retrieve 16k Key-Value pairs?

OK, here's my situation : I have a function - let's say U64 calc (U64 x) - which takes a 64-bit ... -thing, and mostly not influence anyone... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::stod throws out_of_range error for a string that should be valid

#include <iostream> #include <cmath> #include <sstream> using namespace std; int main(){ stringstream ss; double ... I am very concerned. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - sf::Texture as class member doesn't work?

Heyy, I want to draw a sprite in my SFML application but its texture is always white when I use an image and a ... t know what to do anymore :( See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the right way to typedef a type and the same type's pointer?

What is the right way to typedef a type and the same type's pointer? Here is what I mean. Should I do ... I find necessary? Thanks, Boda Cydo. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - can you access private member variables across class instances?

I didn't think it was possible, but if you have two instances of the same class, are you allowed to ... ? Doesn't this break encapsulation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ cli - Best workaround for compiler error C2158: make_public does not support native template types

I have two c++/cli dlls (i.e. compiled with /clr) where A.dll references B.dll. In assembly B, ... C3767: candidate function(s) not accessible See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - C++11: "narrowing conversion inside { }" with modulus

I try to compile the following code with gcc and C++11 enabled: unsigned int id = 100; unsigned char array[] ... 3 fits into an unsigned char? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to make a recursive rule in boost spirit x3 in VS2017

I've written the following recursive rule in boost::spirit::x3 but it only seems to compile in g++/clang, ... 'boost::spirit::x3::unused_type' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Interfacing C++11 array with Cython

I am used to build C++ programs and get it in Cython, but here I am trying to get the C++ 11 array and ... about what I am doing wrong? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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