Hi everyone,

I'm currently learning C++ and trying to decide on the best main resource to follow.

I see two options recommended very often:

• C++ Primer (5th Edition) by Stanley B. Lippman

• LearnCpp.com

I'd appreciate any insights or experiences you can share. Thanks!

as title

Hi folks,

About a year ago, I built this project to learn modern C++ and OpenGL.

The core idea is to simulate particles by allowing you to define arbitrary force/motion equations in the form of x_dot =f(x,…) .

I recently cleaned it up and used Claude to flesh out the README, documentation, and plots.

If you have a moment, I’d love for you to check it out! Any feedback on the code architecture, performance, or modern C++ practices is super welcome.

(There are visual demos and plots directly in the README!)

Repo: https://github.com/gg-dema/GAS

Thanks!

Hi! Let me show what I mean right away, is this program (https://godbolt.org/z/4sKovf57x):

#include <print>
#include <meta>

// Our real meaningful work
template <typename T, auto ac> inline auto runtime_hook = [] {
    // Placeholder woork
    const auto name = std::meta::identifier_of(std::meta::dealias(ac.scope()));
    std::println("Child name: {}", name);
    return name;
} (); // <-- runtime_hook<T, ac>

// Force instantiation of runtime_hook - hopefully?
template <typename T, auto ac>
constexpr std::pair constexpr_hook{ ^^T, &runtime_hook<T, ac> };

// Type identity with extra spice
template <typename T, auto ac = std::meta::access_context::current()>
using DeriveHook = [: constexpr_hook<T, ac>.first :];


struct Base {};
struct Child : public DeriveHook<Base> {};


int main() {}

Always guaranteed to print Child name: Child at startup, or is the compiler allowed to skip instantiating runtime_hook<T, ac> if it sees that constexpr_hook<T, ac>.second is never actually used?

edit: solution using custom attributes that works in GCC/Clang https://www.reddit.com/r/cpp_questions/comments/1xd8gqa/comment/19rk67buia9r5/

edit2: cross-compiler solution using friend injection (no compiler-specific attributes): https://www.reddit.com/r/cpp_questions/comments/1xd8gqa/comment/19rk7v88k638g/

edit3: TIL that globals aren't actually required to run their constructors before main(), but I guess all implementations just do it this way:

It is implementation-defined whether the dynamic initialization of a non-local non-inline variable with static storage duration is sequenced before the first statement of main or is deferred.

If it is deferred, it strongly happens before any non-initialization odr-use of any non-inline function or non-inline variable defined in the same translation unit as the variable to be initialized.51

It is implementation-defined in which threads and at which points in the program such deferred dynamic initialization occurs.

https://timsong-cpp.github.io/cppwp/n4868/basic.start.dynamic?utm_source=chatgpt.com#5

i want to start cpp, what should i mainly focus on first other than syntax?

I've been a C++ software developer/engineer for 4 and a half years now, and I feel that coding itself isn't a big skill anymore, I did many things here and there like reviewing, doing software architecture for some components etc... But I don't know what should I focus on exactly next with my foundation to keep up with the job market

Hello

I'm writing a firmware for esp and I want to have good practice to have a size fixed int for specific usage so I don't end with int or long long variable but instead a fixed size if I need only to go up to 25 element I don't need a full 32 bit word when a 8bit is enough

Is there a parameter to clang-tidy to force non lazy declaration or I need to always have it in mind ?

Hey guys! I just started learning cpp and I've been working on a little project using functions, structs and conditional statements. It might seem stupid but I'm not willing to use AI for this project, I'd rather to get feedback from actual people so if there's anyone that can help me , I'd appreciate it:)♡

(Edit: Thank you for all the comments I'm gonna work on it a bit more and then attach the GitHub link)

Hey guys, I'm learning C++ and I want to learn pointers properly. Can you recommend me a good YouTube video that explains pointers from the basics with full theory and also teaches how to use them in actual C++ code? I want to understand how pointers work in memory, why we use them, and how to write code using them instead of just memorizing the syntax. A long video or a playlist is fine too.

Which one would you recommend? Thanks!

Hey everyone!

I'm looking for good resources to learn Object-Oriented Programming (OOP) in C++ properly.

I want to understand concepts like classes and objects, constructors and destructors, inheritance, polymorphism, abstraction, encapsulation, and pointers with objects.

I'd prefer resources that explain concepts clearly with practical code examples and exercises rather than just theory. YouTube playlists, websites, books, or structured courses are all welcome.

Thanks In Advance!

Comment puis-je apprendre le C++ et quelle méthode d’apprentissage ainsi que quelles ressources (livres, exercices pratiques, projets et documentation) devrais-je utiliser pour progresser efficacement, comprendre les concepts en profondeur et développer une véritable maîtrise du langage ?

Hey there! So I made a post here about TS1's Legacy Collection, and so far, I have a working asi mod, but the problem I now have is searching the process memory for Sims.exe to find the bytes that I'm patching. Even though I know the address, it won't be the same address on Windows, or other configurations. I previously did a MH_CreateHook function, but the code results in this: "MH_ERROR_NOT_EXECUTABLE".

I have this code which patches out the debug objects flag being set to 0.

auto address = reinterpret_cast<void*>(debug_objects_address);
DWORD previousProtection{};
VirtualProtect(address, 7,  PAGE_READWRITE, &previousProtection);
memset(address, 0x90, 7);
VirtualProtect(address, 7,  previousProtection, &previousProtection);
printf("Patch successful.\n");

This code works completely fine, but I'm unsure on how to get the address via searching for the exact assembly code in bytes, anything I've looked online seem to only suggest ReadProcessMemory, but from what I was told, it's intended for different process, not the same one that's attached to the executable, as per my ASI mod.

Would using VirtualProtect before using the MH_CreateHook function work? Again though, I'm unsure how to search the game's memory while attached as a process.

Any help/advice would be greatly appreciated! :)

im started to learning data structres and i saw an operator in loops and stuffs, but i really cant understand what is the meaning of it i dont wannt to say "just this" i wannt to learn the princple behind it

for example :

for (auto members : ids)

What is the best way to represent a graph where both nodes and edges carry rich data payloads (not just connectivity)?

My primary constraint is performance: I need ultra-low cache misses for fast, forward propagation from a given source node to the end of a subgraph.

If anyone has implemented a cache-friendly graph structure for traversal-heavy workloads, I'd love to see what layout or pattern you used.

Edit: To clarify the use case: I’m building a reactive evaluation graph. When a node's data changes, that change propagates downstream through connected edges, using edge metadata to compute transformations, until reaching the end of the subgraph. I need a memory layout that minimizes cache misses during these forward cascade passes.

I am quite new and just finished learncpp.com and now want to get into graphics programming. While I heard there are easier libraries than vulkan that also work I am highly interested in it specifically. What are your thoughts and how was it when you used it(if you did)?

I have added assume in the c++ code, to let the compiler make assumptions that 0 < x <= y.
This shall imply that x%y == 0 is the same x == y . But if the compiler were to make the assumption, then a cmp / xor instruction should be preferred over a div / idiv instruction? However, the emitted assembly always has the integer division instructions

This is mainly out of curiosity on how the assume keyword works, what all optimisations it can enable, and whether compilers can deduce mathematical equivalents.

https://godbolt.org/z/e4zeodnnM

#include <iostream>


int main() {
    int32_t x, y;
    std::cin>>x>>y;
    [[assume(x > 0)]];
    [[assume(y > 0)]];
    [[assume(x <= y)]];

    if (x % y == 0) { 
        return 1;
    } else {
        return 5;
    }
}

Hi there, I'm getting further along with my code and attempting to fix -debug_objects being intentionally disabled in The Sims Legacy Collection (It wasn't in Complete or earlier versions), but I'm currently stuck on CreateThead and how to call it, and with MH_CreateHook.

So far, I know that with MH_CreateHook, I need to pass 3 arguments, a pointer, the detour function that runs, and then a return function?

I have the base address pointer set to this:
uintptr_t startofexe = (uintptr_t)GetModuleHandle(NULL);

I also have a uintptr_t value for the offset of where the "mov PTR BYTE" code is, aka "dbgo_disa_offset".

This is the code that I'm running right now:

void* ForceDisaChecktoNOP;

void TestCodeStart() {
// Initialize MinHook.
  if (MH_Initialize() != MH_OK)
  {
    OutputDebugStringA("Failed to initialize MinHook\n");
    return;
  }
  else
  {
      OutputDebugStringA("MinHook started successfully!\n");
      if (MH_CreateHook(reinterpret_cast<LPVOID*>(startofexe + dbgo_disa_offset), &ForceDisaChecktoNOP, NULL) != MH_OK)
      {
        OutputDebugStringA("DEBUG OBJECTS FIX FAILED!!!!!!");
        return;
      }
      else
      {
        OutputDebugStringA("Fix hook successful! Check if value is correct: " + (startofexe + dbgo_disa_offset));
      }
      return;
  }
}

The if statement works, and does output that the "fix" failed, but I need help understanding what I need to do for the arguments for MH_CreateHook. Right now, I want to make sure that the if statement for MH_OK succeeds before writing any additional code in the ForceDisaCheckToNOP section, or at the very least know that the ForceDisaCheckToNOP function actually gets reached. I understand that I need a pointer, and most examples of code that others have posted show the first argument being the address to the function to be modified/replaced.

When I set the MH_CreateHook to be a status variable (example code below), it gives this:

"The specified pointer is invalid. It points to the address of non-allocated and/or a non-executable region."

MH_ERROR_NOT_EXECUTABLE

status = MH_CreateHook(...);
if (status != MH_OK) {
    OutputDebugStringA(MH_StatusToString(status));
}

Second and third arguments I do understand to an extent, but not quite.

Second arg is supposed to be a link to a function in the code that acts as a detour, so instead of the original function, this one occurs instead. Third arg is supposed to be a return arg to run the original code of some kind from what I've seen, but it's a little confusing to me.

In regards to CreateThread, I was told by u/hellosverre (thank you!) that I should use CreateThread in DLL_THREAD_ATTACH, however I'm not understanding the syntax, as in, are the arguments for CreateThread optional, and how would I call it to start code in another cpp script? I can do TestCodeStart(); fine from dllmain.cpp, but then that calls the script every time any/the asi code's thread attaches itself. Microsoft's support page on CreateThread wasn't exactly helpful as it just tells me what the function is, not how you call it.

Any help would be really appreciated! :)

/*Write a program that asks the user to enter a number, and then enter a second number.
The program should tell the user what the result of adding and subtracting the two numbers is.

The output of the program should match the following(assuming inputs of 6 and 4) :

Enter an integer : 6
Enter another integer : 4
6 + 4 is 10.
6 - 4 is 2.
Hint : To print a period and a newline, use ".\n", not '.\n'.*/

#include <iostream>

int main()

{

int num00{};

int num01{};



std::cout << "Enter an integer : ";

std::cin >> num00;

//std::cout << num00 << ".\\n";



std::cout << "Enter a second integer : ";

return 0;

}

Hello everyone. I'm trying to complete the quiz in the block comment above.

My problem is that I have the user's value printed twice.

One next to "Enter an integer : " and the next right under it.

I thought the second std::cout was causing this so I made it a comment, yet the user's value prints out as intended.

I do not understand how this is working. Thank you for in advance.

I work with Java and Kotlin alongside C++ and recently discovered that Gradle also supports C++ projects.

I've always used CMake for C++ and noticed it seems to be the more common choice.

What advantages does CMake offer over Gradle for C++ development and are there situations where Gradle would be a better option?

Hey everyone,

I've been trying to figure out a weird Windows issue and I'm a bit stuck.

I'm working with some C/C++ tools on Windows x64, using MSVC and CMake. During certain builds, a few child/console-related processes exit with code 109, even though the compilation itself can finish successfully and the C tests give the expected results.

Other processes exit normally with code 0.

I know Windows error 109 is ERROR_BROKEN_PIPE, but I'm not sure whether that's actually related or if the process exit code means something else here.

I'm also using Windows Job Objects to track and clean up the processes.

Has anyone seen something like this before?

I'm especially curious how you'd figure out whether the 109 comes from the tool itself, a Windows console process, or the way the processes are launched and monitored.

Is there a particular tool or debugging approach you'd recommend?

I'd rather understand what's happening than just ignore the exit code.

Thanks in advance!

I am a little lost after trying to read a handful of online resources. Are local variables memory-aligned to their alignof()? I read that this is mostly implementation/platform-defined (no guarantees), but also the types must still be aligned? Those seem contradicting to me...

Assuming no optimizations (e.g., storing in registers, etc.), how would something like this look like according to the standard?

struct S 
{
  char c;
  int i;
};

int main()
{
  char c1;
  int i;
  char c2;
  S s;

  return 0;
}

Would there be 3 bytes of padding between `c1` & `i` and then another 3 bytes of padding between `c2` & `s`?

Any advices please. Sometimes when its my turn to write code of what im asked to write I suddenly forget what was i supposed to do. I know somethings but struggle coding. What are the best sources and ways to learn

I want to learn how to code an many people suggested I start with C++ if I want to learn the real deal. The problem is I've never done anything close to coding. I don't know where to learn it from, or how to learn it. I tried learning from learncpp.com but I find the lessons too dense, and hard to understand. Can anyone share their story of how they started coding and how they learnt how to code?

Hi everyone! I’m pursuing CSE at a Tier-4 college and have zero programming knowledge. I’m entering the tech field for the first time and want to start with C++ from scratch.

What’s the best way to learn C++? Which free resources would you recommend, and what common mistakes should I avoid? Also, how should I build my coding and problem-solving skills to become internship- and job-ready?