C++ 20 (2a) New Features - The Rationale Behind Coroutines

The video discusses the rationale behind using coroutines, starting with a TCP reader example from Cppcon 2015. It highlights the inefficiencies of synchronous code, especially when handling multiple connections, and the complexity of writing asynchronous code using futures. The video then introduces coroutines as a solution, showing how they simplify asynchronous code by using the co_await keyword, making it easier to read and manage.

Why is using multiple threads for numerous connections considered inefficient?

• It enhances performance.

• It simplifies the code.

• It leads to a congested scheduler.

• It requires less memory.

What is a key challenge of writing asynchronous code as described in the video?

• It becomes more complex and harder to follow.

• It eliminates the need for state structures.

• It requires fewer resources.

• It is easier to debug.

How do coroutines help in asynchronous programming?

• They require more threads.

• They increase the complexity of the code.

• They make the code appear synchronous while being asynchronous.

• They eliminate the need for futures.

What keyword is used in coroutines to suspend the execution of a thread?

• co_await

• await

• suspend

• async

What transformation occurs to the return value when coroutines are introduced?

• It becomes a void type.

• It becomes a string.

• It becomes a future int.

• It remains unchanged.