General C++ Programming - C++ Forum

Hi, below, followed by a question: #include <iostream> int main() { //signed short x; unsigned short x; std::cin>>x; if (std::cin.fail...

[8 replies] Last: You mean mine causes undefined behavior? Yes. Neither I noticed so... (by cire)

by Gyiove

Neural network, trying to implement adadelta from caffe.

Hello everyone! I have done alot reading about deep learning and it just happenst to be that the more I read, the more confused I get cause I'm having hard ...

[2 replies] Last: I decided to download the whole html and upload it cause it seems hard... (by Gyiove)

by JFWong

Length of string

int main(){ char *Statement = "Hello! How are you today? I am well, thankyou."; cout << sizeof(Statement) << endl; int j = 0; while( j < sizeof( Stateme...

[2 replies] Last: You use std::strlen() or std::char_traits<char>::length() to deter... (by Duthomhas)

by mtweeman

Exe to open password protected exe

Hi! I wonder if it's possible to code .exe file that can open another, but password protected .exe file. Basically, I wrote application that is encrypted ...

[1 reply] : Greetings, Well, if you look at it the idea is simple : + Create a e... (by Naughty Albatross)

by elay

class private function for one task

is it only okay for a class to have many member function to finish a single task? i do it to separate codes, but i will only call those private function once b...

[1 reply] : How many times you call a function is irrelevant. Use a private functi... (by Peter87)

by gedamial

Little question about std::forward (reference collapsing)

Let's have a function called Y that overloads: void Y(int& lvalue) { cout << "lvalue!" << endl; } void Y(int&& rvalue) { cout << "rvalue!" << endl; } Now...

[2 replies] Last: Hi Cubbi, really thanks for the reply. This argument has been discuss... (by gedamial)

by Wu zhen hai

thread and lock

#include <iostream> #include <thread> #include <mutex> #include <chrono> int main() { std::mutex m; std::thread t1([&]() { while (true) { ...

[8 replies] Last: thanks! (by Wu zhen hai)

by swap1155

header files creation undefined reference

I just started creating header files of my project but i quiet am not getting it right i use code blocks 16.0 currently i am stuck with " undefined reference " ...

[8 replies] Last: closed account 5a8Ym39o6 and coder777 thank you for your suggest... (by swap1155)

by rabster

Getting tuple value via variable

I'm trying to get a tuple's element via an integer variable. The problem is when I run this code I get 14 errors: Error C2784 'const tuple_element<_Idx,std::pa...

[3 replies] Last: I don't think what you're trying to do is possible, think about it, yo... (by a k n)

by gedamial

Parameter Pack expansion - how to understand them correctly?

Hi. I've been struggling for weeks about how Parameter Pack extension really works. Preface: I over-used Google and cppreference, but I still don't get it. ...

[9 replies] Last: Hey, I came up with this some seconds ago template<class... T> doub... (by gedamial)

by MirrorSpock

Passing a derived class object (that is stored in a vector) into a function.

Hello! I am recreating the classic Asteroids game from my childhood, and have run into a problem. Because of the frame rate, bullets pass through asteroids b...

[2 replies] Last: Yes, here is the code for both: std::vector<Bullet> bullets; st... (by MirrorSpock)

by helios

std::condition_variable

I have an issue with std::condition_variable that I can't seem to get through. So, the typical usage pattern for condition variables is std::unique_lock<std:...

[4 replies] Last: Oooh. I had seen several examples where the mutex was not locked at al... (by helios)

by dr86

Reason for declaration of enumerator in OpenFOAM

Hello. I want to implement something new in OpenFOAM, but I have trouble to understanding existing code. Problem starts at line 161, file KinematicPar...

[2 replies] Last: All right. I wanted to give more information, so I have posted in this... (by dr86)

by Roson

What is "Cannot have a type qualifier"?

I have a Class called m_c. When i compile the program, it says : identifier 'm_c' cannot have a type qualifier. What does this mean? thanx in advance!!

[1 reply] : You've got a const somewhere it doesn't belong. (by Duthomhas)

by Shadowwolf

Delaying class member initialization

Lately I've been working on an OpenGL project as a hobby. This project contains a Window class that wraps all window callbacks used by the GLFW library, which I...

[1 reply] : maybe you can define a constructor for Camera that accepts a glfwWindo... (by fcantoro)

by Roson

game - lasers as separate variables

hello world, im currently creating a game where you have a spaceship (movable) and has to shoot asteroids in its path. (Something similar to galaga, i guess)...

[4 replies] Last: @necip...... im currently working with turbo c++, not codeblocks..... ... (by Roson)

by ssoffel

Help with this for loop

In the 1st loop the arguments (nCount, nCount & 3). What does the & 3 do or mean? Storage8<bool> cBoolStorage; for(int nCount = 0; nCount < 10; nCount...

[1 reply] : > What does the nCount & 3 do or mean? It is a bitwise operation. htt... (by Naughty Albatross)

by Monke

Need help with script!

Hey! I'm trying to learn c++ and tried to create a combat simulator. This is the script: #include<iostream> #include<string> #include <random> #include<ctime>...

[9 replies] Last: If you want the results to differ more why don't you use it : std::... (by Naughty Albatross)

by elay

enum problem

in my header file i have this code: class Menu { Menu(); enum page { defaultPage, page1, page2, page3, NONEPAGE }; page menuPage; } int my so...

[3 replies] Last: @AbstractionAnon i thought i wrote menuPage lol thanks guys :) (by elay)

by unclereg

individual pixel control

I am remaking a projects I did in 2000 reproducing steven wolfram's cellular automata. I had some success back in 2000. I used to acces each pixel via something...

[5 replies] Last: You can always load the image data yourself, but you need some kind of... (by Duthomhas)

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General C++ Programming - July 2016 (Page 10)