Now that you've gained valuable insights from previous lessons, it's time to put that knowledge into practice by building a robust Redis-based backend system using C++. In this unit, we'll walk you through the essential steps for implementation, starting with setting up the connection to the Redis server. We'll cover connecting to the server, handling potential errors, and go further to include setting a key with an expiration and retrieving that key.

Utilize your experience to effectively manage user data through these essential operations:

• Adding user data with an expiration time: Ensure that user data is stored temporarily, leveraging the expiration feature to automate cleanup.

• Retrieving user data: Use this operation to access the stored user data when needed, maintaining efficiency and reliability in your backend system.

Here’s a quick example of how we will structure these operations using C++ and hiredis:

In this example, we used hiredis, a minimalistic C client library for Redis, to connect to a Redis server, set user data with an expiration time, and retrieve it. The SETEX command is used to set a key with an expiration time in seconds.

Now that you have a clear idea of what you'll be building, let's start the practice section and implement this logic. This will solidify your understanding and prepare you for more complex tasks in the upcoming units.