[nurettin]

I use boost filesystem and string algos. I can't say they slow down compilation that much. And they save a lot of typing.

[VHRanger]

Theres filesystem TS in c++17. Also experimental/filesystem in all compilers except gcc since 2014

[nurettin]

Sure, threads and datetime has been in certain implementations, too. I think anyone can appreciate the fact that these libraries are not compilation hogs (such as phoenix or mpl) and are portable and save a lot if time.