Recent questions tagged C++

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c++ - Is anything wrong with my doubly linked list swap function?

I have a function which is used to swap 2 nodes: void swap(Node<T>* a, Node<T>* b) { if(a-> ... function. Is there anything wrong with 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++ - Getting desired binary data ranges from std::istreambuf_iterator and std::ifstream

#include <iostream> #include <fstream> #include <iterator> #include <vector> int main() { std::ifstream file("data. ... are in the short range? 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 call a method via a vector?

How do I call a method of an object which is stored within a vector? The following code fails... ClassA* ... , does anyone know? regards mikey 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++ - Qt - How to get mouse events on Qt3DWindow

I want to get mouse events (like mouse position) on a Qt3D Window, every time I click inside the window. I've seen ... qDebug() << "ok"; } } 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 pass class template argument to boost::variant?

I have a template method that uses boost::get of boost:variant module: typedef boost::variant<int, std::string, ... with me your ideas 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++ - float128 and double-double arithmetic

I've seen in wikipedia that someway to implement quad-precision is to use double-double arithmetic even if it's ... a mechanism that avoid 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 have a pair with reference inside vector?

I really need to make std::vector of std::pair with reference (&) inside, but it breaks inside the function ... place). Where is 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++ - Skip an entry of a random iterator

Suppose we have a function foo that does something to all the elements between *firsta and *lastb: foo( ... depend on (lasta-firsta)? 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++ - Having trouble creating an array that shows how the indices were moved in another array

This is the gist of the function I'm trying to make. However whenever I print out the order_of_change array its values are ... x += 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++ - Map input to ast types in boost spirit

I want to implement color highlighting of input string that is being fed to given spirit grammar. Is there an ... iterator rages to ast types. 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 guarantee exact thread sleep interval?

Usually if I want to simulate some work or wait exact time interval I use condition_variable::wait_for ... reach it without condition_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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c++ - Mouse speed not changing by using SPI_SETMOUSESPEED

Why mouse speed is not changing after execution of the following program ? Is it due to SPI_SETMOUSESPEED or due to unable ... " "; 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++ - How to store binary data when you only care about speed?

I have N points in D dimensions, where let's say N is 1 million and D 1 hundred. All my points ... the Hamming distance between each other. 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++ cli - Entry point for C++/CLI x64 WindowsForms App (VS 2015)

I have the same problem as the user in Visual Studio 2015 c++/CLI boost::thread : If I use boost, Windows ... via dumpbin but with no success! 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 WM_PAINT in a Subclassed CStatic Control

I created a custom control whose class has CStatic as base class. Currently I handle the drawing using WM_PAINT ... control to PaintDC** } 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 LNK1169: one or more multiply defined symbols found

I have 3 files: SilverLines.h SilverLines.cpp main.cpp At SilverLines.cpp I have: #include "SilverLines.h." ... string /*company*/> companies; 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++ - Only first Compute Shader array element appears updated

Trying to send an array of integer to a compute shader, sets an arbitrary value to each integer and then ... initial value initialized in host. 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++ - isdigit raises a debug assertion when entering £ and ¬

The below code works for every character I type in except for ￡ or ?. Why do I get a "debug assertion fail"? #include ... << "not a digit "; } } 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++ - preferred mechanism to attach a type to a scalar?

[ edit: changed meters/yards to foo/bar; this isn't about converting meters to yards. ] What's the ... hardly any complexity or overhead. 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++ - Convert 16 bits mask to 16 bytes mask

Is there any way to convert the following code: int mask16 = 0b1010101010101010; // int or short, signed or ... << 64) | 0x2928292829282928; See Question&Answers more detail:os...

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

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642 views

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c++ - Static method with a field

I am currently integrating lua with C++. For lua I need static methods which I've put in a class. I need the ... save my data in there? 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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484 views

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c++ - Boost Spirit kwd parser in Visual Studio 2013

I'm using Boost 1.57 with Visual Studio 2010. I would like to upgrade my project to Visual Studio 2013 ... grammar) Any help is appreciated. See Question&Answers more detail:os...

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

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491 views

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c++ - How can realize my own memory viewer by QT

Recently I am writing a debugger for my own hardware. I want to add a memory viewer widget like the eclipse or ... setting to make it like 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++ - input validation for numeric input

I'm very new to this C++ world and trying write a input validation function for numeric password. This is ... any more improvement? Cheers!! See Question&Answers more detail:os...

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

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603 views

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c++ - Using boost in CLR

I have problem like this, but answer did not help. I have some classes in h and cpp files(which uses boost), ... ) What's the problem? 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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659 views

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c++ - WriteConsole access violation in function call but not from main()

I am trying to use WriteConsole(..) in a function call but I get access violation. When I un-comment the code ... printf("Write Failed "); } } 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 generate a function without providing arguments?

So c++17 has std::function Deduction Guides so given: int foo(); I can do: std::function bar(foo) ... provide the parameter types. Live Example See Question&Answers more detail:os...

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

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798 views

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c++ - Bit vector and bitset

What is the difference between bit-vector and bitset container of stl ? Please explain. To my understanding bitset ... to implement bit vector? See Question&Answers more detail:os...

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

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