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General C++ Programming - August 2015 (Page 3)

Hi All, I am working on a project for modeling robotic dynamics. It requires to compile very very long c++ expressions produced by a symbolic tool. One of th...

[3 replies] Last: Try making the variables volatile qualified with external linkage. ... (by JLBorges)

by piotr5

is there a simpler way to write an abs function?

first off the requirement is, my integer class has no copy-constructor, instead it's a child of: template <class T, class B = EmptyClass> class DeepCopyOption...

[7 replies] Last: @nayonrony: I'm not sure why you copypasted JLBorges' post, but I did ... (by LB)

by pacman169

Error

Now getting this error when compiling this macro: Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for ma...

[8 replies] Last: I'm also somewhat fearful of having to work within the limitations of ... (by shadowmouse)

by ChajusSaib

move contructor and move assignment for a union-like class

Is there a better way to write a move constructor and move assignment for the class below. // g++ -std=c++14 main.cpp Token.cpp -o z -Wall -pedantic #include...

[2 replies] Last: @JLBorges Thank you, hope I've done it right this time. Token::Toke... (by ChajusSaib)

by ChajusSaib

expected class name error

Hello lads, I seem to be having an issue with a simple program. The error messages I am getting is this: main.cpp: In member function ‘Token& Token::opera...

[8 replies] Last: @JLBorges Thanks again mate, totally flew over my head. (by ChajusSaib)

by closed account 38qG1hU5

Key Reading

I know I just posted a newby post but I have another one. I have bought c++ books and searched the web but still can't figure out how to make the code read when...

[8 replies] Last: Oh, look, they're doing it to me now. Some people are easily amused, ... (by MikeyBoy)

by pfjf2

sfml - drawing text

Hello, I am having difficulty drawing text to a window using SFML. My code is below : #include "stdafx.h" #include <iostream> #include <SFML/Graphics...

[3 replies] Last: More then likely it isn't loading because you don't have the font insi... (by Z e r e o)

by royeh

Not running well in writing data in a csv file in VS2013

I am trying to write data to a cvs file and is working great. There is only a problem that I have to close after inserting data for the next one. I was working ...

[no replies]

by yj1214

Using OpenGL to make GUI

Instead of using libraries like Qt, wxWidgets, GTK+ etc. is it a good idea to make GUI using only pure OpenGL? Let's say I made a GUI program with pure OpenG...

[2 replies] Last: Something that should be mentioned is that writing a UI library from s... (by TwilightSpectre)

by rmxhaha

Is this a bug ?

is this a bug in the compiler ??? this doesn't compile #include <stdio.h> typedef struct { unsigned int HH,MM,DD; } Jam; int main(){ Jam Jam...

[1 reply] : C++ is case-sensitive, so JamAkhir and JamAKhir are not related. ... (by LB)

by ForTheReallys

Deleting a char array from the Heap

Alright so I've written a function that returns a pointer to a char array on the heap. So my code looks something like this char *ptr = func("This is the argu...

[2 replies] Last: I used gdb to check this. But I was just being stupid. I assumed tha... (by ForTheReallys)

by SuperCrusader

Writing GUI Applications in C++

I am quite experienced with C++(programming for over 1 year),I know how to make CLI/Console Programs,but I cannot wrap my mind over GUI programming in C++,Every...

[6 replies] Last: Qt is great, if you don't mind the GPL/LGPL. For other options, see... (by Duthomhas)

by Duthomhas

does output_iterator_tag imply non-terminating sequence?

In other words, can I assume that an output iterator (http://www.cplusplus.com/reference/iterator/OutputIterator/ ) can safely be written to without fear of bo...

[8 replies] Last: Yes. template <typename Iterator, typename Category> struct... (by Duthomhas)

by Sid123

Code compiles and starts running, then stops? no errors found though?

The code is too long to paste here but does anyone know what could cause "project.exe is not working on windows"? the program compiles fine and there are no bui...

[7 replies] Last: The debugger is the most helpful tool in all cases, both when you are ... (by LB)

by JDev

Seeking a Mentor

I have been dabbling with C++ for a few months now having read a few books and finding resources over the internet, but haven't engaged in socializing with team...

[6 replies] Last: Run /server chat.freenode.net and then /join #cplusplus.com in hexchat (by fabtasticwill)

by aeck

Big O Notation

Question: for ( j = 0; j < n; j++ ) { for ( k = j; k < n; k++ ) { <some operation> } } Algebraic Expression: n(n+1) = n^2 + n Big ...

[3 replies] Last: Yes. See https://en.wikipedia.org/wiki/Triangular_number (by helios)

by matrixtay99

Verification of code

hi can someone advise me on why my programme code cannot run properly. The program supposed to prompts the user to enter a number ranging from 0 to 9999. the pr...

[3 replies] Last: #include <iostream> int main() { bool has_1_2_or_3 = false ; // ... (by JLBorges)

by closed account 38qG1hU5

Is it possible to do this?

Is it possible to make a program create file with certain data points, and then load the file and read the data inside? (Sorry If this is a newb question i'm qu...

[5 replies] Last: No, it doesn't handle graphs, but I'm actually working on a generator ... (by helios)

by leourb

Custom Iterator for list<class>

Good morning. I have a problem regarding iterators and custom classes. I confess that I am not so confident with them and I am finding difficult to set in mind ...

[2 replies] Last: Okay.. It is actually working.. Thank you Peter87. (by leourb)

by sunflower

function to cal avg, put in performance formula and compare

Hi all, need to do a function to cal avg, put in performance formula and compare Performance = (Annual Average Actual Output Capacity / Annual Average Expec...

[1 reply] : We can see that each element in the 2D array is a MachineType struct. ... (by keskiverto)

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