I mean it when I say look into the topics in depth. Lambdas are done in a more machine code efficient way than anything else I have seen. It is basically just syntax for a functor, whose calls can be inlined right inside the callee.

Stl is similarly elegant from the narrow perspective of inlining, and getting rid of indirection that people tend to write when doing abstract data types in C. It took me a long time of hating C++ and preferring C before I was willing to see this. I still kind of prefer C but these days I am much more willing to concede that there are strengths in C++ that you can't easily match with equivalent C code.