The Standard Template Library (STL) is a software library for the C++ programming language that influenced many parts of the C++ Standard Library. It provides four components called algorithms, containers, functional, and iterators.(from wikipedia)
You can read different types of STL's source code in different folders and I recommend you to read sgi's code and houjie's comment.
Folder called rewrite includes some codes wriiten by myself when I'm learning STL.
2016/09/03 String vector
2016/05/16 Memory pool---something about allocator
2016/05/16 STL_allocator note wriiten in chinese
2016/04/21 Reference wriiten in both Chinese and English
Wikipedia Standard Template Library
sgi Official website sgi Official website