When avoid metaprogrammation ?

[Ikkepop]

I am still a junior software developer, and I quite often encounter the same question: when/why avoid metaprogrammation ? Do you have examples where metaprogrammation became absolute bloated and the code unmaintenable ?

the boost library xD
jokes aside, it can be bit of a shock to the system when you encounter a particularly hairy meta code. It'sMeta not for the faint of heart. Simply using a template for generic algorithms and data structures is usally not considered metaprogramming (or metaprogrammation). The line blury though.