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Am I just dumb or is the CMake tutorial incredibly confusing??
Hi there!
I wanted to do things right this time, and get more accustomed to reading the docs instead of some quick'n'easy tutorial to get a better grasp of the subject matter. So I started following this tutorial from CMake, shown by this link: https://cmake.org/cmake/help/latest/guide/tutorial/A%20Basic%20Starting%20Point.html#exercise-1-building-a-basic-project
But for some reason, this tutorial has become such a pain in the ass to follow. The way the tutorial phrases things are often ambiguous to me, like the part about configured header files. (what is the input file here? And what is the output file?)
And the inclusion of todo's is nice. But what is the point of doing those to-dos when they don't show you how to write those commands syntactically correct without showing the answer, leading me to google things that the tutorial should be covering instead.
I have not even finished step 1 yet and feel incredibly confused to the point of yeeting out the official tutorial and instead picking up some book which covers the topic thoroughly and clearly instead.
So yea... Am I the only one feeling like this or are there others who feel what I am feeling r?
I'd love to know...
Cheers!
https://redd.it/1mfxamk
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cppreference 2019 offline archives 404
It looks like the offline 2019 version of the cppreference is down. Anyone got it?
https://redd.it/1mgup46
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Need advice on sockets , crypto libraries and some design choices
Hey reddit , I find myself here to hopefully plan out a side project , for which I figured out this could be a good place to seek advice.
This project's main focus is going to be around 'end to end encryption (E2EE)' , along with other cryptographic algorithms ( like hashing , diffie Hellman key exchange , X3DH etc which I'll add once I make a bare bone version first)
Before coming down to this , I've been horsing around with the GMP library and implemented diffie-Hellman key exchange , along with a simplified variant of Pollard’s p - 1 algorithm.
The thing i haven't figured out yet , is i want this project to be a functional one , meaning it should be able to communicate and connect to other computer.
One thing that's completely alien to me is Socket programming . This will completly be a new side of C++ for me , and to add to it , the APIs seem to be platform specific , Meaning Windows and Linux based OS would need to be worked on differently.
on doing some research , i realised that i can hand the part of Socket programming to Python which sounds like a fairly good option. the problem being i haven't used python for a scale of something like this yet and secondly i believe C++ is what 'just works' with me. i have never bothred being good in python.
Second option being , i learn the socket programming in CPP itself , make different version for Windows and Linux based OS . This is the part where it starts to feel like climbing a mountain.
what Initially came to my mind as " i could finish this in 3 days " now seems more complicated.
as per my research (chatGPT) , i've several options for hashing libraries , namely
1. OpenSSL
2. libsodium
3. Crypto++
4. Botan
i'd love to know your opinions on these.
Questions :
1. should i opt for python to handle the Socket programming part , or Just Raw dog it in C++ ?
2. What libraries i should consider to implement hashing and crytographic funtions ?
3. what are some design pitfalls i should avoid ?
4. if anyone has worked on something which is related to these , what have been your learnings and advices ?
Any advice or Suggestion is welcomed ;)
https://redd.it/1mgq726
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A C++ cron at Bologna Airport
https://github.com/GiuseppePuleri/NanoCron
https://redd.it/1mggdkm
@r_cpp
I'm currently learning C++, but I'm struggling to break down the learning path.
I'm currently learning C++, but I'm struggling to break down the learning path.
When I was learning C, I followed a simple process: I read from books, watched tutorials, and then solved problems. That worked well.
However, with C++, this approach isn't working for me. For example, when I try to learn just the string type in C++, I find that it has 20–30 different functions associated with it. The same applies to vector and other STL components. This makes it overwhelming, and I don’t know which functions to focus on or how to practice them effectively.
I'm following the NPTEL "Programming in Modern C++" tutorial and reading the book The C++ Programming Language by Bjarne Stroustrup. The NPTEL tutorials are good, but I noticed that they introduce advanced topics like sorting algorithms in lecture 4 and data structures like stacks in lecture 5.
This jumps ahead quickly, and I’m left wondering:
What should I actually do after watching each tutorial? What kind of problems should I solve?
Right now, I don’t have a clear direction or system for practicing.
https://redd.it/1mgbz9v
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A Library Approach to Constant Template Parameters
https://brevzin.github.io/c++/2025/08/02/ctp-reflection/
https://redd.it/1mfvy5v
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Visual Assist X in 2025?
Hello,
I'm a long Visual Assist X user, I haven't updated my license since early 2021. Now with the awakening of Github Copilot and the Claude models, I am not sure what advantage does VAX offers.
My most used features have been:
Find References,
Refactor
Font color changes (functions, vars, etc.)
Display functions correctly
Basically what Intellisense intended to be and never did. But, no clue if there are new interesting features or if it's even worth to update the license.
I can ask Github Copilot to refactor entire code bases and it will do it correctly...
https://redd.it/1mfazg8
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Im new to coding just started a few weeks ago, any tips?
https://redd.it/1mf5gyv
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Completed Cpp by Tim Buchalka's Cpp course on UDemy.
What to do now, researched a bit and came across CMake, but what is it, some engine, IDE or what?
Please tell me what is CMake and how to learn it.
https://redd.it/1mewhz3
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C++26 Reflections adventures & compile time UML
https://www.reachablecode.com/2025/07/31/c26-reflections-adventures-compile-time-uml/
https://redd.it/1mevtwm
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(advanced) linker madness on visual studio 2022.
Hi,
Im really stuck here and cannot for the life of me figure out what's going on. Im thinking an issue with visual studio linker, but not sure.
I have generated code (its protoc generated) and there are LOT and LOTS of generated classes. So many that we hit the COFF/PE 64k limit on exported symbols at link time. This is a critical issue for us.
Right now the nature of our app , doesnt currently allow us to split/separate out the .protos. Its just the way it is (for the moment).
My solution to reducing the exported symbol count;
Instead of having the protoc generated classes export every thing like this;
class PROTOBUF_EXPORTS Object : public google::protobuf::Message
{
// all the methods / constructor/destructor etc.
// lots and lots of unused methods etc exported.
}
I have a python script that correctly alters the generated code to ONLY export the symbols we need. In addition it adds one (the key) virtual void foo(); function.
so the script modified code looks like;
class Object : public google::protobuf::Message
{
PROTOBUF_EXPORTS Object();
PROTOBUF_EXPORTS virtual \~Object();
PROTOBUF_EXPORTS virtual void Swap(Object* other);
PROTOBUF_EXPORTS virtual void foo();
// a few other key methods that our clients will call.....
};
the added "virtual void foo()" is added to the .cc file correctly.
i.e. the intention is to export (via __declspec(dllexport) ONLY the functions our client code needs, thereby significantly reducing the number of symbols exported in the .dll)
Despite the fact that the "virtual void foo()" function is in there (key function for vtable emission, as I understand it) , I was getting unresolved externals for all these Objects;
"unresolved external Object::`vftable"
"unresolved external Bar::`vftable"
"unresolved external Foo::`vftable"
"unresolved external Blah::`vftable"
(lots of others too, for all our Message objects. The only way I could get the library in question to link correctly (tried #pragma link /export and #pragma link /include but to no avail) , was to use a .def file and for the vftable to be exported. this works a treat for the dll being built in question.
With this approach
dumpbin /exports on the dll works and I can see all the mangled Object::`vftable symbols. Similarly in the corresponding .lib file, "dumpbin /symbols" on the .lib file shows everything exactly as I want it (all the vftable symbols are in there.)
BUT ... and this is the big blocker I CANNOT resolve;
When I link OUR dll (the client... that imports those same symbols via __declspec(dllimport)) against the dll above, the vftable unresolved externals reappear. They shouldnt, they are defined in the dll and .lib and dumpbin /exports and dumpbin /symbols on the .dll and .lib respectively proves it. The names are IDENTICAL (trust me I've verified).
Can anybody help me?
https://redd.it/1mepvlg
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Eliding away class boundaries by use of a single internal pointer for private data
I was thinking about the "no zero cost abstractions" talk, how all class variable usages hide a secret this->, which adds an indirection, thus adding cost which we thought we were using freely. Then it occurred to me: what if you could statically prove that "this" indirections could be safely collapsed into the enclosing scope?
Here's how it would work:
1. Your class does all of its operations through an internal pointer, call it p
2. since all data is accessed through this->p, the compiler can simply replace it with someobj_p, which is a stack variable of the same type as p.
3. Perhaps the compiler can reason about the code better now that a layer has been removed, unlocking further optimizations
In thinking about this design, I had some further questions:
1. is this an existing optimization in C++ compilers? If so, how well does it work? If not, why not?
2. How would you test the effectiveness of this optimization, if it is an improvement?
3. Would you adopt a strange-ish style to unlock these optimization in your code?
Thanks!
https://redd.it/1mell33
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Will reflection simplify the implementation of std::execution?
Reflection and std::execution are both adopted in C++26, and std::execution requires a lot of metaprogramming.
https://redd.it/1mdwhbi
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Any more trip reports from Sofia
Whenever there is an iso committee meeting I get excited and can't wait for the trip reports to drop. This summer we've only had one from our esteemed chair Herb. Are there any others coming? And if not why (maybe there was a ln explict request/decision) for having the chair as a single spokesperson or some such thing?)
From the list of papers a lot of work on the table and a lot was done. It would be nice to hear some other perspectives particularly given the number of tracks that run in parallel. 🙏
https://redd.it/1me0we5
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Preparing for C++ Developer Interview | What Resources Should I Use?
Hey everyone,
I have an upcoming interview for a C++ Developer role next week. The job involves working on core C++ systems in a Unix/RHEL environment, with a focus on multithreading, networked systems, and scripting for automation and integration.
Here’s a breakdown of the main skills they’re looking
C++ with STL, Boost, and multithreading
Unix/RHEL development and systems-level programming
Network programming and working with complex, interconnected systems
Shell scripting, Perl, Python
Working with Oracle databases
PKI and Digital Certificate technologies
XML, functional and unit test drivers, writing/reading design documents
My Ask:
I want to go in very well-prepared and I'm looking for in-depth resources to sharpen up these areas before the interview.
What are the best resources (courses, books, etc.) for all the topics
https://redd.it/1mdosph
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Getting into C++ in 2025
I recently watched the new F1 movie and I got hooked by the technology and the systems used under the hood. Did some research and unsurprisingly most of them are written in C++. I want to learn it so can you guys tell me how do I get into C++ and what to start with and how to proceed with C++. And is there a market for it in 2025?
https://redd.it/1mgvyqm
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C++ Show and Tell - August 2025
Use this thread to share anything you've written in C++. This includes:
* a tool you've written
* a game you've been working on
* your first non-trivial C++ program
The rules of this thread are very straight forward:
* The project must involve C++ in some way.
* It must be something you (alone or with others) have done.
* Please share a link, if applicable.
* Please post images, if applicable.
If you're working on a C++ library, you can also share new releases or major updates in a dedicated post as before. The line we're drawing is between "written in C++" and "useful for C++ programmers specifically". If you're writing a C++ library or tool for C++ developers, that's something C++ programmers can use and is on-topic for a main submission. It's different if you're just using C++ to implement a generic program that isn't specifically about C++: you're free to share it here, but it wouldn't quite fit as a standalone post.
Last month's thread: https://www.reddit.com/r/cpp/comments/1lozjuq/c_show_and_tell_july_2025/
https://redd.it/1mgt2gy
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Running non-trivial C++ on Cloudflare WASM
https://saus.app/blag/cpp-on-cloudflare-wasm
https://redd.it/1mglch7
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Which C++ version does the Switch 2 SDK support?
And in general, which C++ version should we target to be able to easily build for all modern console?
https://redd.it/1mge6lb
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What's the best way to handle animation frame events/functions
I'm working in SFML and I have an animator class that can loop and returns true when it finishes, but I want to be able to give some frames functions to do and not just check for loops. I'm still new to SFML and C++ so I'm not sure how to go about this with popular engine functionalities in a memory and speed efficient manner
bool Animation::update(float deltaTime, sf::Sprite& sprite) {
// returns true if reached final frame in animation
time += deltaTime;
if (time > framescurrentFrame.duration) {
time = 0;
currentFrame++;
if (loops && currentFrame >= frameCount) return true;
currentFrame %= frameCount;
sprite.setTextureRect(framescurrentFrame.rect);
}
return false;
}
// Animation.h
struct AnimationFrame {
sf::IntRect rect;
float duration;
AnimationFrame(sf::IntRect rect, float duration);
};
struct Animation {
int currentFrame;
float time;
bool loops;
sf::Texture texture;
std::vector<AnimationFrame> frames;
int frameCount;
Animation() = default;
Animation(std::string spritePath, int frames, int framerate, int textureSizes2, int cellSizes2);
bool update(float deltaTime, sf::Sprite& sprite);
void start(sf::Sprite& sprite);
};
https://redd.it/1mg3sah
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Is there any way to get used to CPP?
Hi everyone,
I'm professionally software developer using Kotlin (9 years).
For my hobby time I'm playing around game dev, specifically Unreal Engine. I know that Unreal's CPP isn't fully same experience as in regular CPP, but I think question is still valid. No matter how much and how small scope I tried to use CPP, I quickly become overwhelmed by two files for single class and so on.
Does anyone also come from high level languages? How to deal with it? I refuse to believe that I'm too old to learn new skill 30 years old, I'm still kid xD). And is it okey to have such experience at all?
I see that all game dev is generally based on C++, so I need somehow to adapt to it, I just don't know how..
Thank you in advance!
https://redd.it/1mfubk5
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[RFC] Hardening mode for the compiler - Clang Frontend
https://discourse.llvm.org/t/rfc-hardening-mode-for-the-compiler/87660
https://redd.it/1mf5xko
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Static vs Dynamic Linking for High-Performance / Low-Latency Applications?
Hey everyone,
I’ve been thinking about something and figured this would be the right place to ask.
In your opinion, is static linking or dynamic linking the better approach for high-performance and low-latency software? I'm particularly curious about what’s commonly done in the HFT world or other latency-critical systems.
Does static linking offer any meaningful performance advantage, especially in terms of things like symbol resolution, code locality, or instruction cache behavior?
Would love to hear your thoughts, both from a practical and theoretical point of view.
https://redd.it/1mf3m3o
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I want to create an Operating system
As the title suggests-I want to build my own operating system. I am in my final year in college for computer science bachelors and this is the capstone project and I want to get it right. Are there any resources where I can get started. I have good understanding of C and this is the project that i think could challenging.
https://redd.it/1mewkv2
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Cpp Roadmap !
Is there a roadmap or checklist you can recommend to become a Cpp Developer?
https://redd.it/1meqfeb
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IceBear: A Fine-Grained Incremental Scheduler for C/C++ Static Analyzers
https://doi.org/10.1145/3696630.3728590
https://redd.it/1mel32y
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Created a c++ study group for anyone interested
Just hit me in the comments section and I’ll send you the link for the study group. The study group is being held on discord for anyone interested
https://redd.it/1meicoz
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Can I build projects without headers (only using modules) with C++20?
Hey there!
I'm relatively new to C++, and I'm wondering - are modules actually a thing now? I’ve been trying to find projects that rely solely on modules to avoid the traditional two-file header/implementation setup. Coming from a C# background, that split feels a bit clunky to me.
C++20 has been out for five years, but I still haven’t seen much real-world usage of modules. Are they still in a raw or experimental state, or is there a specific reason why most developers continue to stick with headers?
Thanks!
https://redd.it/1medoyw
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Custom GUI?
Hey I'm trying to make GUI library backed by skia graphics. Currently I made a basic project that is able to draw Button, Text ( single line, no text wrap ) and Animate stuff around but I'm currently lacking at making layouts and handling events and passing it to children View. I'm trying to replicate android's View.
I'm making it to develop quick apps with ready to use and customisable ui components.
Would like to have some advice
https://redd.it/1mdrsuw
@r_cpp
Why is it still so hard to modernize large C/C++ codebases? (Anyone tried Moderne or Grit?)
I’ve been digging into the ecosystem around legacy code migration—especially C/C++—and it seems like we’re still stuck with either consulting firms, regex-powered hacks, or internal tooling that takes months to stand up.
Is this just an unsolved problem because:
* Tooling can’t understand semantics/context?
* Enterprises don’t trust automatic rewrites?
* There’s no test coverage to validate correctness?
Would love to hear from folks who’ve used Grit, Codemod, Gitar, or any of the new players
Is this a real unlock or still vapor?
https://redd.it/1mdmgvo
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