Implementing static_vector: How Hard Could it Be?

October 25 • 4:45pm - 5:45pm

by David Stone

static_vector is a std::vector that allocates things on the stack instead of the heap. We have std::vector, so it should be easy to write a non-allocating version, right?

Sadly, it's not quite that simple. There are many aspects of the vector interface that make sense based on a container that can reallocate, but do not make sense for a container that cannot. This leads to some API differences. static_vector also faces certain challenges around constexpr that makes it both more and less constexpr than std::vector.

We will go into detail on how std::vector and how static_vector work, how they are similar, and how they differ. This presentation will be focusing on lower-level details and interactions with specific language features in C++20 and (hopefully) C++23. There will be lots of code examples, and we'll step through how they work and where they fall short, trying to build up to a working, production-ready solution.

6 Ways to Refactor new/delete into unique ptr

by Bartlomiej Filipek

In legacy code, you can often spot explicit new and delete lurking in various places and waiting to produce pointer-related issues. This blog post shows six patterns to improve that erroneous style and rely on modern techniques, especially unique_ptr and other helper standard types...

Automatic Return Type (C++98)

by Rainer Grimm

Depending on the used C++ standard, there are different ways to return the right return type of a function template. In this post, I start with traits (C++98), continue in my next post with C++11/14, and end with concepts (C++20)...

About Student- and Supporttickets and volunteering at Meeting C++ 2021

by Jens Weller

A quick reminder, that you can register for the Student and Supporttickets for Meeting C++ 2021 until the end of October! Plus a bit on volunteering.

Like in the last years Meeting C++ also offers in 2021 a way to attend the conference for Students through the Studentticket and for various other groups through the Supportticket. This years conference is online and a unique opportunity to get to know the C++ community. You'll be able to attend the conference for the full 3 days, Hubilo is a great platform to view the sessions or hang out in the lounge to have a discussion about C++.

Design Idioms from an Alternate Universe

Wednesday, October 27 • 10:30am - 11:30am

by Ivan Čukić

This session is part of the Software Design Track.

It is common to see different design idioms and patterns in different programming paradigms as they represent /the way/ something should be implemented in a given paradigm, and each paradigm is special enough for its way to be completely different to the way taken by the other ones.

While C++ is an one of a kind multiparadigm langugage, people tend to use object-oriented patterns with it most of the time. Generic and functional programming are also where C++ shines, so why avoid learning and using idioms from those two paradigms? People often think that they need to stick to a single paradigm not realizing that the true power lies in skillfully combining all of them.

This talk will present several software design idioms that people usually connect with generic and functional programming disciplines, but which are highly applicable to the usual code most of the contemporary C++ developers write every day.

KDAB at CppCon 2021

by Charlotte Johansson

CppCon is the annual, week-long face-to-face gathering for the entire C++ community – the biggest C++ event in the world. This year, CppCon takes place both Online and at the Gaylord Rockies Hotel and Convention Center in Aurora, Colorado.

KDAB is a Registration sponsor, and Ivan Čukić is offering a talk on Wednesday, October 27th 10:30 am – 11:30 am MDT as part of the Software Design Track...

CppCon 2021 Online Keynote: Six Impossible Things by Kevlin Henney

We’ve previously announced keynotes by Bjarne Stroustrup, Herb Sutter, Lisa Lippincott, Michael Caisse, and Sean Parent. This is the last of our six conference keynotes to be announced...

A (Short) Tour of C++ Modules

Thursday, October 28 • 10:30am - 11:30am

by Daniela Engert

Modules are probably the most impactful and most transformative recent major addition to the C++ language. From a user perspective, Modules are conceptually simple and the idea is easy to grasp. And with the C++20 ecosystem maturing, using Modules and adopting them into every-day programming is both feasable and advantageous.

But what is the motivation that lead to the invention of Modules and their inclusion into the standard? How do they look like? Which are the three key features of C++ Modules that exist since the inception of the language, that are mostly irrelevant in the typical usage of 'classical' C++ such that hardly any programmer needs to know much about them but a Modules developer does? What surprises might lie on the path of transforming a classical library into a Module? Are there still any issues, loose ends or open questions regarding Modules?

The talk will try to give a comprehensive answer to those questions. The audience shall get enough information to decide when the right time has come for them to take the plunge and move their codebase to Modules wherever it is advantageous.

A simple and clear example of undefined behavior

by Jens Weller

If you work with C++ you'll sooner or later will have to deal with undefined behavior. I stumbled upon an easy example to help folks understand the scope of undefined behavoir...

CppCon 2021 Keynote: Warning: std::find() is Broken! by Sean Parent Live, In Person

We’ve previously announced keynotes by Bjarne Stroustrup, Herb Sutter, Lisa Lippincott and Michael Caisse. This is the fifth of our six conference keynotes to be announced...