1. Pretend the library already exists. 2. Use your experience as a library user to write code using the library. 3. Implement the library so that the code fro

1. Pretend the library already exists. 2. Use your experience as a library user to write code using the library. 3. Implement the library so that the code from step 2 actually works. If you discover that your implementation seems to require a lot of boilerplate and you suspect that metaprogramming could help simplify things, you can try it. Otherwise don't bother.