To me, meta-programming should not creep into a function. It's ok to generate functions or initializers or whatever with it, but it should not be an inconspicuo

To me, meta-programming should not creep into a function. It's ok to generate functions or initializers or whatever with it, but it should not be an inconspicuous part of an otherwise normal function body, especially not if it affects control flow. If it really, really helps readability, perhaps it could be used at the top level, but not inside a loop or conditional statement. I might make an exception for complex type declarations. But, like all programming: it should help readability and it should help to avoid bugs, not be used for its own sake, aka cleverness.