[lmm]

> AOP is about cross cutting concerns and being able easily insert similar functionalities in unrelated areas of the code.

Yes, monad transformers exist to let you do that. They're the thing that makes it possible to insert an effect in a code area that's using other, unrelated effects.

[hota_mazi]

Reread carefully my characterization of AOP.

Cross cutting concerns allow you to insert a certain line of code in "file 1 at line 223 and file 2 at line 400" because these lines match a certain type safe regexp.

Monad transformers accomplish nothing remotely close to that.

[lmm]

Don't be so rude.

> Cross cutting concerns allow you to insert a certain line of code in "file 1 at line 223 and file 2 at line 400" because these lines match a certain type safe regexp.

What you're describing is the implementation details of how AOP works. Cross-cutting concerns refers to the problem statement: secondary concerns that need to be addressed in the same way in different parts of the codebase with minimal disruption to the primary logical code in those different parts of the codebase.