please wait
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by kbw
What is an undefined reference/unresolved external symbol error and how do I fix it?
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| It depends on where you see it, during compile or link. It means you've used something without declaring or defining it, which one depends on what you've done. |
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Jun 21, 2022 at 8:04pm
[1 reply] : Usually the error also says where the bad reference comes from. Read ... (by dhayden)
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by DickFulthorp
Why Have Functions() in classes? (1,2)
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| Why Have Functions() in classes? As a C only programmer trying to learn C++ I don't understand why functions() are defined inside of classes? Why is this differ... |
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Jun 21, 2022 at 5:18pm
[35 replies] Last: That only covers C++11. Better C++11 than either C++98/03 or no stan... (by deleted account xyzzy)
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by seeplus
Ranges overkill?
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| The latest article from Rainer Grimm ( http://www.modernescpp.com/index.php/ranges-improvements-with-c-23 ) shows examples of using std::ranges to produce a con... |
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Jun 21, 2022 at 6:57am
[5 replies] Last: Here's a talk about std::ranges that shows better use cases. https://w... (by thmm)
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by n00b1e
UnorderedMap
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| How would you implement bidirectional iterators for generic UnorederedMap class with: ++, --, < and *. |
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Jun 20, 2022 at 2:17pm
[6 replies] Last: yeah I meant == and != not < sry (by n00b1e)
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by JamieAl
Matrix Division in Eigen vs MATLAB
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| I am trying to find the equivalent of the opertaor in MATLAB: A = B/C where here A,B, and C are all square matrices with say N-by-N . So I have the foll... |
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Jun 20, 2022 at 4:40am
[5 replies] Last: @mbozzi Thanks! This is pretty helpful actually. (by JamieAl)
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| A moved C++ container and MSVC++ (1,2) |
| #include <iostream> #include <vector> int main() { std::vector vec1 { 1, 2, 3, 4, 5 }; std::cout << "vec1 size: " << vec1.size() << "\n\n"; ... |
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Jun 19, 2022 at 4:51pm
[20 replies] Last: This is my take on ' valid but unspecified state ': valid : operatio... (by JLBorges)
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by woohyeon
fwrite(Buffer, sizeof(A), N, fp) vs fwrite(Buffer, sizeof(A) * N, 1, fp)
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| I have a byte array which stores a lot of struct data. When I use fwrite function, which is more efficient way? // POD struct Foo { } Foo Buffer ; ... |
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Jun 18, 2022 at 9:01pm
[7 replies] Last: If you only write as one object then you either have a successful wri... (by dhayden)
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by salem c
PID controller setup for each cores of the CPU
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| Dirty toerag "Walker154" edited with the spam. |
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Jun 17, 2022 at 7:12pm
[1 reply] : how many variables are in your state? This sounds like it could be si... (by jonnin)
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by Geckoo
OpenGL
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| Hello everyone. I have a question about 3d development having made my own 2D engine without any dependencies. I took a look at many alternatives so as to create... |
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Jun 17, 2022 at 11:41am
[3 replies] Last: I don't think Vulkan will make OpenGL obsolete, or that OpenGL w... (by kigar64551)
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by SomeStudent
"for (int i" vs "for (i"
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| Is there any reason why choose one over the other? int i; for (i=0; i<10; i++) { // instructions } or for (int i=0; i<10; i++) { // instructions } ... |
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Jun 16, 2022 at 12:07pm
[18 replies] Last: Yeah - but in C++ a ref is just a pointer 'under the hood'... (by seeplus)
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by Wallby
A predefined macro for macro recursion in c?
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| Hello, I read that traditionally recursive macros were possible in c but that is no longer the case. I was wondering.. has it even been considered to add a pr... |
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Jun 16, 2022 at 11:25am
[12 replies] Last: Many education systems (especially in the UK) seem to teach Java as a ... (by seeplus)
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by t im
About the End of Multi-level Pointer
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| Just as the code below: int a = 1; int *p0 = &a; int **p1 = &p0; ...... Then, where is the end of the pointer. |
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Jun 16, 2022 at 10:26am
[4 replies] Last: Thanks all the answers. I got it. (by t im)
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by DOOMReboot
Best Design Pattern(s) to Load Binary File
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| I've got an old game data file that contains binary data and would like your opinion as to which design pattern(s) I could optimally use to load the data. Th... |
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Jun 16, 2022 at 1:10am
[2 replies] Last: have you considered the kiss design pattern instead? Half kidding, bu... (by jonnin)
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| help |
| Well, to begin with you could Please learn to use code tags, they make reading and commenting on source code MUCH easier. How to use code tags: http://w... |
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Jun 15, 2022 at 12:59pm
[3 replies] Last: Ah, another "I need better code" leech shows up. They get it and then... (by deleted account xyzzy)
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by frek
MinAveRange exercise
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| Hi all, It's about a task on Codility saying summarily: Find the range (with at least two elements) in an array A (with the following specs) that contains the... |
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Jun 14, 2022 at 2:40pm
[16 replies] Last: When working on a solution, a couple of times I was quite close to the... (by frek)
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by Cplusc
adding header and cpp files from different folder in VS project (1,2)
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| I had a visual studio project which was working perfectly. As far as the project contained many headers and it was sometime confusing to navigate through, I dec... |
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Jun 14, 2022 at 10:33am
[20 replies] Last: Thank you all for your good points. (by Cplusc)
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by Kingfrankbob
Help with Float point refrencing
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| https://youtu.be/KnCNfBb2ODQ Near the end of the video the guy mentions that to zoom infinitely you need a float point representation system. I've done resea... |
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Jun 10, 2022 at 6:48pm
[9 replies] Last: yes. the most simple, basic thing would be to use base 10 (inefficient... (by jonnin)
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by DeepMohinman
Does opencv have a constexpr vector or matrix container
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| I would like to do something like this for example: constexpr std::array<cv::Vec3b, 6> COLORS { cv::Vec3b(0, 255, 0), // green cv::Vec3b(255, 0, 0)... |
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Jun 10, 2022 at 8:44am
[3 replies] Last: const std::vector<cv::Vec<unsigned char, 3> > As current, std::vector... (by seeplus)
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by copypasta
Wandbox (Online) - How To Save?
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| Been using Wandbox online browser IDE just to practice and learn. Was wondering how can I save my code? Is there anywhere I can save so when I login I can conti... |
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Jun 10, 2022 at 4:37am
[2 replies] Last: Using an online compiler is not the best way to learn C++ since many k... (by deleted account xyzzy)
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by SomeStudent
Struct as function parameter
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| I have been using the following way of passing a structure to a function #include <iostream> #include <cstring> using namespace std; struct datast { int a,... |
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Jun 10, 2022 at 2:12am
[4 replies] Last: // For “in” parameters, pass cheaply-copied types by value and ot... (by JLBorges)
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