Name: 0x3A: Orthodox C++ - a ship with convention, and Efficiency Without Illusions
Start: 2025-11-27T16:30:00.000Z
Location: Prevas AB

Hello all! Welcome to our C++ meetup for November.

This time Björn Andersson will deliver a presentation about what actually happens before a program starta executing and the main function is called. This is a re-run of a presentation done at the FOSS North Community day earlier this year.

We are kindly hosted by Nexer this time.

**Abstract**
Have you ever wondered what happens before the main() function starts running your program? Many programmers assume that a program begins in main, but there's a crucial sequence of steps that leads the processor to that point.

In this talk, we will explore, step-by-step, what happens from the point of the processor being powered on how a freestanding, non-trivial C++ program on an embedded device is being prepared before invoking main(). Examples will be based on an STM32 ARM Cortex-M4 core.

**Agenda**:
18:00 Doors open
18:30 Introduction from GbgCpp and our host
18:40 Björn Andersson - What happens before main?
20:00 Event over

GbgCpp - Gothenburg C++ Meetup

Daniel Eriksson

Dave Brown

Fredde

Jakob Klein

Emre Aslan

emil.ake.rosenberg

Mustafa Mete

Björn Andersson

Ludwig Rydberg

anna.skoryk4

Gerhard

Vitali K

Bengt Farre

Kaveh Nematipour

Jessica Barai

Carlos Galvez

Gilles Fernandez

Alex

Ilia Oblomkov

Hans-Martin Duringhof

What happens before main()?

Nexer Group

Welcome to our 58th Meetup, the final one for 2025!
We’re closing the year with a great program and a special guest from outside Stockholm.
A big thank you to [Prevas AB](https://www.prevas.se/) for hosting the evening!

**The program:**
\- Intro\, news\, and quiz

* **Harald**: Orthodox C++, The Vasa has shipped, but who broke the contract
* **Casual mingling** and networking with refreshments 🍕🥤🤝
* **Filipe**: Efficiency Without Illusions: LLM-Assisted C++ Design & Refactoring (Gains, Limits, and Safety Rails)

**Door open 17:30, the program starts at 18:00**

The program in detail:

**Harald Achit: Orthodox C++, The Vasa has shipped, but who broke the contract**
Observations and reflections about the latest stories and 🎭 in the C++ world

**Filipe Mulonde: Efficiency Without Illusions: LLM-Assisted C++ Design & Refactoring (Gains, Limits, and Safety Rails)**
LLMs can speed up C++ design and refactoring—but only when you work with their constraints. This talk maps the real efficiency curve: where models accelerate work (API reshaping, mechanical edits, migration playbooks, doc/test scaffolding) and where they slow you down (non-local invariants, concurrency/memory model, UB traps, ABI stability, perf-critical paths). We’ll dig into hard limits—context windows, long-range dependencies across large repos, latency and rate limits, token costs, reproducibility—and show practical mitigations.

**Väl mött!** 🎉

StockholmCpp

Harald

Patrik Åkerlind

Filipe Mulonde

Hampus Avekvist

Johan Berg

Emil Jansson

Jonas Lund

Mathieu Ropert

Callmyr

Stefan Petersen

Sinister Maliniemi

Simon Asplund

Hannes Bredberg

Arno Lepisk

Johannes

Antonia

Bulut Bulgu

Ilias Bergstrom

Arda Aytekin

Björn Fahller

0x3A: Orthodox C++ - a ship with convention, and Efficiency Without Illusions

Prevas AB

SwedenCpp

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