2018
https://habr.com/post/428846/

rope
http://llvm.org/docs/doxygen/html/classllvm_1_1Twine.html
https://github.com/facebook/fatal/blob/master/fatal/string/rope.h
https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/ext/rope
http://www.sgi.com/tech/stl/Rope.html