Whenever I've worked for a company that decided to re-implement all their own strings and containers, I'd always try to suss out whether they actually did it fo

Whenever I've worked for a company that decided to re-implement all their own strings and containers, I'd always try to suss out whether they actually did it for one of those actual good reasons, or if they were just cargo culting someone long ago who once said "STL BAD IT'S SLOW" and that was all it took to convince them to write 20K lines of unmaintainable and unnecessary OurString OurVector, and OurList crap. So far, I've never found one place who knew why they reimplemented all that stuff. I do know one person who works in games whose company actually had a good reason to do their own containers, but these cases are rare.