The Active Object design pattern is a concurrency pattern that decouples method execution from method invocation to enhance the responsiveness and scalability of an application. This pattern is particularly useful in scenarios where multiple operations need to be performed concurrently without blocking the main thread of execution.

This talk presents modern methods for the Active Object design pattern, also known as Actor objects, in C++ and introduces activecpp (https://github.com/samiralavi/activecpp), a useful single-header templated library to implement this pattern effectively. Key features of the Active Object design pattern, alongside best practices for low-power embedded systems, are discussed, and the activecpp library is showcased for a typical IoT application on an ESP32-S3 SoC-based devkit.