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Pet Project vs. Tutorial
I am not new to programming. I have some experience with C++ too, not a beginner, more like intermediate as I was solving algorithmic problems. But i only know as much as I needed to to solve the problems. Now i want to go deeper into C++, I kinda want to take some tutorial, but it feels like a waste of time since a lot of things i do know, but i want to structure my knowledge and fill in the gaps. On the other side I can develop a pet project (sfml game in my case) but it seems like I'll again only learn as much as i need to develop it. What are your thoughts?
https://redd.it/18hqf8c
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CISA Urges Abandoning C/C++
https://www.nsa.gov/Press-Room/Press-Releases-Statements/Press-Release-View/Article/3608324/us-and-international-partners-issue-recommendations-to-secure-software-products/
https://redd.it/18hit60
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Is compiler allowed to reorder independent memory store instructions?
int main() {
int a = new int(0);
int b = new int(0);
int c;
if (randint() % 2 == 0) {
c = a;
} else {
c = b;
}
c = 1; // store instruction A
b = 3; // store instruction B
printf("%d\n", b);
}
Let's assume compiler compiles code below,
is there any chance that compiler reorders store instruction A,B (execute B before A) and make printed result as 1?
https://redd.it/18hbnpr
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CppGuard: C/C++ developer tool for detecting deadlocks
https://github.com/JochenBaier/cppguard
I have written a C/C++ tool to find deadlocks under Windows. It should not replace existing tools but extend the tool collection.
The tool does monitor Windows Critical Sections and std::mutex. This allows you to test whole programs (or a DLL) or source code parts that are not testable with ThreadSanitizer under Linux. It uses the deadlock algorithm from the C++ library Abseil.
The API monitoring works like that: The header file cppguard.hpp is automatically included in all source files using the Visual Studio option “Forced Include File”. Macros like #define EnterCriticalSection(x) cppguard_enter_critical_section(x) will intercept the API call. This works better than expected.
Later I want to try to extend the tool to find memory and handle leaks as well. On other idea is to provide robustness test e.g. sockets functions will return an error now and then. However, the tool should always remain fast.
Since r/cpp readers does not produce deadlocks please tell your colleagues about it ;)
https://redd.it/18hbnez
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How are libraries which handle audio or graphics made
What are these libraries built off of?
https://redd.it/18h8lzp
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Which fields are worth using cpp other than graphics, games and embedded systems ?
Im feeling burned out by cant choosing the field i want to work on. Im at university 2nd class now. Doing bunch of projects on drones, uavs etc. I've tried a lot of fields like machine learning, frontend, backend, mobile, game dev and embedded systems but none of these fields seems to make me happy. Until now i've looked into like 6 programming languages. Used all of them for a bit. Only experience i get is that i like to use a language that accesses the low level stuff like cpp. But i dont know where i will use it at all. I just want to choose something and master it. Any suggestions ?
https://redd.it/18h1dj6
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How Badly Do We Want Correct Compilers? - John Regehr - NDC TechTown 2023
https://www.youtube.com/watch?v=tMYYrR-hazI
https://redd.it/18gucux
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Distance arguments to std::advance and std::nextstd::advance and std::next are really similar to each other, the only real difference as far as I can tell is that std::next returns the result while std::advance modifies its argument. However there is another weird difference, which is that std::advance takes the second "offset" argument as generic type and std::next takes it as std::iterator_traits<...>::difference_type. This means that if I can pass a size_t (unsigned) offset to std::advance without any warnings, but to use std::next I have to insert a kind of useless cast to ptrdiff_t to get rid of the implicit sign conversion warning. I would really like to use std::next because of value semantics but the cast is bothering me. Has anyone ever run into this issue and how come std::next and std::advance are designed differently?
https://redd.it/18goh8t
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how to generate activation code for a C++ program (edited).
Let's assume I have written a program, I want to sell it, but I want to send the customers activation code so that only the customers I know can start my program (c++). can you also let a program (c++ exe) run for a certain amount of time? This means that after delivery, my program m(c++) can only be used for testing purposes for a certain period of time
https://redd.it/18gmt1o
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How to use iterators?
I’ve been writing cpp for a couple years now, I have used iterators a couple times. Do y’all have any simple iterator examples that easily explain how to use them. The times I’ve used them I was forced to use auto because I didn’t know how to write out the full type of the iterator.
https://redd.it/18gag3y
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I like C++ because of TypeScript
TypeScript is one my favorite language because of the flexibility of the type system. It’s super fun making the types fit your needs and constraints.
I’m relatively new to C++ — only started writing C++ 2 years ago at my $day_job. However with templates, SFINAE, and concepts, it feels like a stricter, faster TypeScript. It’s actually pretty fun writing modern C++.
https://redd.it/18g5zti
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B trees implementation
Would anyone have a B tree implementation I can use (which they've done themselves) I need it for my project which is due soon so I won't have enough time to do it myself (a generic code pls)
https://redd.it/18fz9sa
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Six Handy Operations for String Processing in C++20/23
https://www.cppstories.com/2023/six-handy-ops-for-string-processing/
https://redd.it/18fur76
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Deploy multi-platform applications with C++ (desktop, mobile and web). An example with Dear ImGui
IMHO, deploying multi-platform C++ applications with CMake is still a painful point in the developer experience.
CPack is a good start, but I think it still leaves a lot to be desired, especially when it comes to configuring deployment settings for different platforms (assets embedding, application icon and publishing settings), especially when targeting mobile phones and web apps (emscripten).
When developing my library (based on Dear ImGui), I designed a collection of cmake functions dedicated to help deploy assets, convert icons, and configure application deployment settings. It is currently tailored for my library, but I believe it might serve as a valuable inspiration.
See short demo video
PS:
I do not own an Android device anymore, so that the Android support is largely out of date in the cmake functions
I'm quite busy, working on several Open Source projects already, so that I do not consider publishing this library as a standalone CMake utility. However, if someone, someday, is interested in trying to tackle this, I'd be happy to provide information.
https://redd.it/18frmcu
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std::ranges::range_adaptor_closure but better! A C++ Talk by Me 😗.
https://youtu.be/Dt7vFHNkUDs?si=ZSpOcqlGPD5tSCmU
https://redd.it/18fpg08
@r_cpp
Working on an easy-to-use C++ string library
Hi everyone,
I'm a developer who has made a lot of functions to solve problems with strings in my own individual projects, and I'd like to share them with you in a library! I'm still working on it, but I have a good start right now. Please let me know what you think :)
https://github.com/Bucephalus-Studios/stevensStringLib
https://redd.it/18hlkgd
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std::vector at overloading
Hi!
first up: I know that this is a dumb Idea, but i want to try it to learn stuff. And because there are situations where std::vector is better than std:map.
Suppose i want to search for a string in a vector like this:
for(int i=0; i<vec.size();i++){
if(vec.at(i).at(0)==search){
return i;
}
}
is there a way to overload the .at method to do this? And is it possible to add a find method to check if a 2d vector includes this element?
TL;DR: how can i abuse std::vector::at and add ad find method to use std::vector like std::map?
https://redd.it/18hejde
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When private member function?
https://playfulprogramming.blogspot.com/2023/12/when-private-member-function.html
https://redd.it/18haomj
@r_cpp
std::simd: How to Express Inherent Parallelism Efficiently Via Data-parallel Types - Matthias Kretz
https://www.youtube.com/watch?v=LAJ_hywLtMA
https://redd.it/18hapgb
@r_cpp
I just made first GUI in QT/C++, Please roast me.
https://github.com/Croudxd/Password_Generator/tree/master
https://redd.it/18h54lv
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libriscv v1.0
https://fwsgonzo.medium.com/libriscv-version-1-0-594985712e2e
https://redd.it/18gw7yz
@r_cpp
Are there any comprehensive courses for C++ like there are for Python?
so I want to learn C++ and am struggling to find a good online course. I have completed one course, "Replit 100 days of Code, " which was for Python. the course was good because I was getting daily projects and replit was a good platform to work on (at least for me), also I think there are several other courses for Python just like this one (udemy's 100 days of code, for example). I cannot find any course for C++ which is this comprehensive. If I tried to take codedamns course but there were no video lectures and if I go on YouTube for video lectures, I feel like they are more focused on theory instead of practice. Can anyone suggest some good courses for C++, I don't want any certificate or anything, I just want to learn the language and want to work on projects.
https://redd.it/18gqix5
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Tricky questions from job interviews
Here I will share some tricky questions I was asked on job interviews for C++ developer.
OOP:
\- How can we modify class members inside const class methods?
\- What happens if we try to use dynamic_cast to cast between two unrelated types?
Multithreading:
\- What is deadlock in multithreading app?
\- What is race condition in multithreading app?
\- What is type safety? Are STL
\- Should we use lock_guard for thread safe data types?
\- What are ways for thread safety?
\- What types of mutexes exist?
\- We create thread, set mutex with lock_guard, allocate dynamic memory and release mutex. Can we make sure that the memory will be released?
\- What are ways to synchronize data btw threads?
\- Are async commands blocking or non-blocking?
Networking
What are private (grey) and public (white) IP addresses?
We create client - server on sockets. What happens when we create socket or open socket on physical level?
Let’s image that 10K clients send request to the same port on server at the same moment. What will happen?
Do I know abt virtual ports?
​
UPD: this list will be updated later
https://redd.it/18gn0tx
@r_cpp
Logic Circuit Diagram
Hello Community,
I'm doing my assignment that requires me to print out a truth table for the attached logic circuit diagram and I'm wondering of the code I wrote is correct or if there's anything I can do better.
This is the image of the given circuit code:
https://ibb.co/tLG7Bkp
I have named each gate with using A, B and C as input and abbreviations as An for !A or A && B as AaB (little a standing for an) and of course a combination like AnaBn would be !A && !B.
The truth table comes out correct I did double check but I wonder if there's something I could've done better or more effective. Thanks so much!
This is the code:
\#include <iostream>
using namespace std;
// Function to represent the AND gate
bool AND(bool a, bool b) {
return (a && b);
}
// Function to represent the OR gate
bool OR(bool a, bool b) {
return (a || b);
}
// Function to represent the NOT gate
bool NOT(bool a) {
return (!a);
}
int main() {
bool inputs[2\] = { 0, 1 };
cout << "A\\tB\\tC\\tResult\\n";
for (int A = 1; A >= 0; --A) {
for (int B = 1; B >= 0; --B) {
for (int C = 1; C >= 0; --C) {
bool AnaBn, AnaB, AaBn, AaB;
bool AnaBnaCn, AnaBaC, AaBnaC, AaBaCn;
bool AnaBnaCnoAnaBaC, AaBnaCoAaBaCn;
AnaBn = AND(NOT(A), NOT(B));
AnaB = AND(NOT(A), B);
AaBn = AND(A, NOT(B));
AaB = AND(A, B);
AnaBnaCn = AND(AnaBn, NOT(C));
AnaBaC = AND(AnaB, C);
AaBnaC = AND(AaBn, C);
AaBaCn = AND(AaB, NOT(C));
AnaBnaCnoAnaBaC = OR(AnaBnaCn, AnaBaC);
AaBnaCoAaBaCn = OR(AaBnaC, AaBaCn);
cout << inputs[A\] << "\\t" << inputs[B\] << "\\t" << inputs[C\] << "\\t" << OR(AnaBnaCnoAnaBaC, AaBnaCoAaBaCn) << "\\n";
}
}
}
return 0;
}
https://redd.it/18ggs0s
@r_cpp
Is there any way I can remove the value from an integer
Like imagine I declare
Int x;
Like that and I don’t assign a variable then later I say
x=4;
Is there any way I can then return x to how it was earlier when i declared it and it had no value?
https://redd.it/18g9lgo
@r_cpp
Minor issue on cppreference.com if anyone has an appropriate account?
Hi all,
On the page:
https://en.cppreference.com/w/c/language/struct
// A pointer to a struct can be cast to a pointer to its first member
// and vice versa.
char pmake = (char )pship;
pship = (struct spaceship )pmake;
Should be:
// A pointer to a struct can be cast to a pointer to its first member
// and vice versa.
char pmake = (char )pship;
pship = (struct spaceship )pmake;
The first field in the structure is a char * not a char. So a pointer to a char pointer is char **.
As it stands, if you printf pmake, you would get junk characters.
Just noticed it when doing a little bit of strict aliasing research. If someone has an account in good standing (mine is too recent), then this is a heads up :)
Karsten
https://redd.it/18g50qq
@r_cpp
C++ Videos Released This Month - December 2023 (Updated To Include Videos Released 12/04/23 - 12/10/23
This month the following C++ videos have been published to YouTube
CppCon
12/04/2023 - 12/10/2023
Finding Your Codebases C++ Roots - Katherine Rocha - CppCon 2023 - [https://youtu.be/N4SaOfVrdTE](https://youtu.be/N4SaOfVrdTE)
Things Happening in SG14… - Patrice Roy - CppCon 2023 - https://youtu.be/1qaYyB4dU3I
Back to Basics: Functions in C++ - Mike Shah - CppCon 2023 - [https://youtu.be/CpHX1Du5R0Q](https://youtu.be/CpHX1Du5R0Q)
A Long Journey of Changing std::sort Implementation at Scale - Danila Kutenin - CppCon 2023 - https://youtu.be/cMRyQkrjEeI
Lifetime Safety in C++: Past, Present and Future - Gabor Horvath - CppCon 2023 - [https://youtu.be/PTdy65m\_gRE](https://youtu.be/PTdy65m_gRE)
11/27/2023 - 12/03/2023
New in Visual Studio: CMake Debugger, Better Diagnostics, and Video Games - David Li & Mryam Girmay - https://youtu.be/0UbkMysE7OM
How Visual Studio Code Helps You Develop More Efficiently in C++ - Alexandra Kemper and Sinem Akinci - [https://youtu.be/Soy3RjGYUJw](https://youtu.be/Soy3RjGYUJw)
Expressive Compile-time Parsers in C++ - Alon Wolf - CppCon 2023 - https://youtu.be/F5v\_q62S3Vg
Back to Basics: Debugging in Cpp - Greg Law - CppCon 2023 - [https://youtu.be/qgszy9GquRs](https://youtu.be/qgszy9GquRs)
Customization Methods: Connecting User and C++ Library Code - Inbal Levi - CppCon 2023 - https://youtu.be/mdh9GLWXWyY
All of these talks can also be accessed at https://cppcon.programmingarchive.com where you can also find information on how to get early access to the rest of the CppCon 2023 videos and lightning talks.
Meeting C++
12/04/2023 - 12/10/2023
Variable Monitoring with Declarative Interfaces - Nikolaj Fogh - Meeting C++ 2023 - [https://www.youtube.com/watch?v=AJDbu1kaj5g](https://www.youtube.com/watch?v=AJDbu1kaj5g)
Dependency Injection Patterns: Efficiency and Usability - Vladimir Vishnevskii - Meeting C++ 2023 - https://www.youtube.com/watch?v=OtBPRneGfJM
C++ Horizons - Bryce Adelstein Lelbach - Meeting C++ 2023 - [https://www.youtube.com/watch?v=og4\_Tm-Hkjw](https://www.youtube.com/watch?v=og4_Tm-Hkjw)
11/27/2023 - 12/03/2023
Performance matters - new tricks for old dogs - Matt Bentley - Meeting C++ 2023 - https://www.youtube.com/watch?v=XvEUYN9YgKY
How to start a modern C++ project - Mikhail Svetkin - Meeting C++ 2023 - [https://www.youtube.com/watch?v=UI\_QayAb9U0](https://www.youtube.com/watch?v=UI_QayAb9U0)
Better C++ ranges - Arno Schödl - Meeting C++ 2023 - https://www.youtube.com/watch?v=fODb3MsfWRM
https://redd.it/18fx7a3
@r_cpp
How to use std::span from C++20 -- Bartlomiej Filipek : Standard C++
https://isocpp.org//blog/2023/12/how-to-use-stdspan-from-cpp20-bartlomiej-filipek
https://redd.it/18frbgw
@r_cpp
30 years of DOOM: new code, new bugs
https://pvs-studio.com/en/blog/posts/cpp/1087/
https://redd.it/18fr0iq
@r_cpp
In C++, how can I make a default parameter be the this pointer of the caller? - The Old New Thing
https://devblogs.microsoft.com/oldnewthing/20231207-00/?p=109115
https://redd.it/18fo9u1
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