General C++ Programming - C++ Forum

Hello, I am writing a program and it is compiled without any error. However, when I run that program, it is showing the error below. terminate called a...

[4 replies] Last: getFriendlyPose() is being called in an infinite loop. Is it allocatin... (by dutch)

by adnan345

i have two text files which contain integer type data i want to perform bubble sort on them.

#include <iostream> using namespace std; #include <fstream> #include <string> int main(){ const int require=15; const int require2=100000 ; int count;...

[1 reply] : You should edit your post to add code tags so that your code retains i... (by dutch)

by kyletrugliaeder

Help with prime number code C++ (1,2)

Hey everyone. I am having trouble with my code and I do not understand what is going on. I wrote a code where I enter a number and it will tell me if it is a pr...

[28 replies] Last: I'm not the op. I just been playing around with it. @dhayden.... thi... (by markyrocks)

by theingar

Storing data in Vector of Struct

Hello, I am writing a program using ROS Workspace. There is a structure of data and which is converted to std::vector in somewhere of the codes. I am trying to...

[7 replies] Last: As far as I can tell, that will compile, but is that really what you w... (by helios)

by TheToaster

std::function

Why does std::function require that its function object be copy constructable? I wrote a custom version of std::function via my own type erasure classes the oth...

[1 reply] : https://quuxplusone.github.io/blog/2019/03/27/design-space-for-std-fun... (by dutch)

by rxpantsu

No Output, where is the problem?

DISCLAIMER: I don't want somebody to solve this for me, I just need someone to look the code over and let me know either where I went wrong (during file input,...

[1 reply] : Some points. 1. Writing 120 lines all in a single function isn't good... (by salem c)

by frek

C++ move semantics

Hello all, Do you, please, agree with the text below? • We refer to traditional C++ references (the single-ampersand one) as lvalue references. Modern C++ ...

[3 replies] Last: I also read about return value optimization on the Web. But I think w... (by TheToaster)

by JUANDENT

A lambda with a dangling reference...

Hi, I have a lambda with a dangling reference (i.e. it captures by reference a number passed by value, i_ below): template <typename T> auto f1(T i_)...

[3 replies] Last: it captures by reference because it has [&] in the lambda.. (by JUANDENT)

by volang

IOCP Threadpool

From microsoft: "When a process creates an I/O completion port, the system creates an associated queue object for requests whose sole purpose is to service the...

[no replies]

by AlessandroTZ

Initialize pair constructor

Good evening to everyone, I'm learning how to use pair function, and my compiler says to me that i'm making an error because my pair contructor is initialize...

[10 replies] Last: Okay i get it, i'll try to solve it thank you! (by AlessandroTZ)

by aceadams

Infinite Loop?

string Automaton :: generation_to_string(const vector<int>& gen, size_t width){ if(width%2 ==0) return ""; string ans = ""; for(auto u:gen){ if(!u) ...

[5 replies] Last: @doug4 The issue seems to be that (width-gen.size())/2; can be negativ... (by aceadams)

by summerli

How do I stop getting it to output 1

Hi this is my code: #include <iostream> using namespace std; void primeNumbers (int a, int b) { int flag, i; while (a <= b) { flag = 0;...

[2 replies] Last: Why don't you break the tasks in 2 parts. One function that checks if ... (by Thomas1965)

by Vycues

Mouse moving a picture box in C++ GUI

I am trying to move a picture box and drag it to a different location on the form using the left button pushed down on the mouse. The code below moves the pictu...

[2 replies] Last: Thank you so much. it works now. (by Vycues)

by thanhquan1704

Huffman

My code is #include <iostream> #include <map> #include <fstream> struct huffman_node { int priority; char letter = 0; // Use null char for internal nodes, ...

[8 replies] Last: There are a number of problems. freq_dist_from_file() is recursive, b... (by kbw)

by JUANDENT

how to get the current executable directory?

Hi, filesystem::current_path() returns current working directory but I need the directory from which the executing program was launched. Is there a way? R...

[6 replies] Last: GetModuleFileName works!! Thanks!! Juan (by JUANDENT)

by AlessandroTZ

Unique_ptr with templates

Goodmorning to everyone. I'm trying to use smart_pointers for representing template variables into classes. Here an example: #include <iostream> #include <m...

[2 replies] Last: I'm so sorry, i've just noticed an error in the rest of my program tha... (by AlessandroTZ)

by cosinus

How to change my code?

Hi everyone, I’m quite green in programming but I want to know how to change my code that generates ARRAY and divides every element by RAND_MAX number into co...

[7 replies] Last: @helios, Thanks for the info. Now I know. (by doug4)

by frek

Temp objects

Hi all, A quick question: using namespace std; double t = 5; double test() { return t; } int main() { test() = 14; cout << t << '\n'; cin.get(); r...

[6 replies] Last: Depends on your system, but here's one set of answers: https://docs.mi... (by Repeater)

by volang

new unique char inside each object

struct ClientInfo { WSABUF Buffer; ClientInfo() { Buffer.buf = new char ; Buffer.len = 2000; } }; Every new object that is created from this s...

[5 replies] Last: You're copying an object into another, where the class of both contain... (by helios)

by tigerking

Help with implementing Dijkstra's Algorithm

Hello, I am having trouble implementing pathfinding in my program. I am using coordinate based vertexes along with edges holding the coordinates of the related...

[5 replies] Last: I managed to get it implemented by going back after my vertexes are cr... (by tigerking)

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General C++ Programming - May 2020