Adding elements to arrays and changing variables during compilation – imperative meta-metaprogramming in C++
If you follow these steps, you might learn to write things normally impossible to do in compile time, such as self-registering factory.
Category: Programming
C++20 Resumable functions: Goodbye state machines, no one will mourn you
C++20 allows writing functions that suspend and can continue at the next line. This has an amazing application at avoiding writing annoying and error-prone state machines. This article showcases how coroutines can clean up a function that would usually need an ugly state machine.
Error codes are far slower than exceptions
TL;DR On modern 64-bit PC architectures, C++ exceptions only add unreachable code with destructor calls into functions and their effect on performance is below 1%, but such low values are difficult to measure. Handling rare errors with return values requires additional branching that slows down the program in realistic scenarios by about 5% and are also less convenient. If an exception is actually thrown, stack unwinding costs about 2 µs per stack frame.
The Sisyphean task of enabling Adobe Flash Player in a modern QT/Chromium based web browser
Prologue and motivation A part of my PhD. research deals with computer science as a source of innovative ways to…
(Sort of) Reflection in C++11
This is yet another trick to achieve reflection-like functionality before Reflection TS, this time needing only C++11. It’s based on using CRTP to fill the object with carefully chosen garbage before initialisation.
Reflection in C++14
How to write a template function that takes a class and executes type-dependent code on all its member variables, without requiring the class to specifically support it?
Adding OpenCV libraries to a QT5 project in Ubuntu 20.04
I’ve recently gained interest in OpenCV. The problem with this is, that in most modern tutorials and walkthroughs it seems…
Optimising a scene for VR in Unreal Engine
Since I bought Oculus Quest, I felt that it lacked a proper Doom-like action shooter. I created a scene in the editor based on what I envisioned, but it was absolutely impossible to run on Oculus Quest. This article describes various tricks I have used to bring it to Quest without too much sacrifice.
Using vectors in place of hashtables – not as dumb as it seems
Vector can find elements in linear time, hashtable in constant time. That’s a pretty elementary part of computer science. However, better complexity does not always mean it’s faster.
Super compact serialisation of C++ classes
How about defining the variable, initialising it and writing code for serialisation and deserialisation on a single line of code?